H
SECTION H — ELECTRICITY
 H01
BASIC ELECTRIC ELEMENTS
 H01

Note(s)

Processes involving only a single technical art, e.g. drying, coating, for which provision exists elsewhere are classified in the relevant class for that art.

 H01H
ELECTRIC SWITCHES; RELAYS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B 7/10; arrester using powdered resistive or semiconductive material H01C 7/12, H01C 15/04; electrolytic arresters H01G 9/00; switching devices of the waveguide type H01P; devices for interrupted current collection H01R 39/00; spark-gap arresters H01T; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K 17/00)
 H01H

Note(s)

  1. Bases, casings, or covers accommodating two or more switching devices, or a switching device as well as another electric component, e.g. bus-bar, line connector, are classified used in H02B 1/08.
  2. For the purpose of this sub-class, the term "relay" is used to denote a switching device having contacts which are operated from electric inputs which supply, directly or indirectly, all the mechanical energy necessary to cause both the closure and the opening of the contacts.
  3. Under the heading "emergency protective devices", this sub-class deals with devices for the protection of electric lines or electric machines or apparatus in the event of undesired change from normal electric working conditions, the electrical condition serving directly as the input to the device.
  4. In this sub-class:
    1. The expression "driving mechanism" refers to the means by which an operating force applied to the switch is transmitted to the moving contact or contacts. The word "operating" is used in a broader sense than "actuating" which is reserved for those parts not touched by hand to effect switching. The words "acting" and "action" denote a self-induced movement of parts at one stage of the switching. These connotations apply to all parts of the verbs "to operate", "to actuate", and "to act", and to words derived therefrom, e.g. to "actuation".
    2. Details of an unspecified type of switching device, or stated to be applicable to two or more kinds of switching devices designated by the headings "switches", "relays", "selector switches", and "emergency protective devices", are classified in groups H01H 1/00-H01H 9/00. Details of an unspecified type of switch, or stated to be applicable to two or more types of switches as defined by groups H01H 13/00-H01H 43/00 and sub-groups H01H 35/02, H01H 35/06, H01H 35/14, H01H 35/18, H01H 35/24, and H01H 35/42, all hereinafter termed basic types, are classified in groups H01H 1/00-H01H 9/00. Details of an unspecified type of relay, or stated to be applicable to two or more types of relays as defined by groups H01H 51/00-H01H 61/00, hereinafter called basic types, are classified in H01H 45/00. Details of an unspecified protective device, or applicable to two or more types of protective devices as defined by groups H01H 73/00-H01H 83/00, hereinafter called basic types, are classified in H01H 71/00. However, a detail only described with reference to or clearly only applicable to switching devices of a single basic type, is classified in the group or sub-group appropriate to switching devices of that basic type, e.g. H01H 19/02, H01H 75/04.
 H01H 1/00 - 
H01H 43/00
Electric switches
 H01H 1/00
Contacts (liquid contacts H01H 29/04)
 H01H 1/02
·  characterised by the material thereof
 H01H 1/04
·  ·  Co-operating contacts of different material
 H01H 1/06
·  characterised by the shape or structure of the contact-making surface, e.g. grooved
 H01H 1/08
·  ·  wetted with mercury
 H01H 1/10
·  ·  Laminated contacts with divided contact surface
 H01H 1/12
·  characterised by the manner in which co-operating contacts engage
 H01H 1/14
·  ·  by abutting
 H01H 1/16
·  ·  ·  by rolling; by wrapping; Roller or ball contacts
 H01H 1/18
·  ·  ·  with subsequent sliding
 H01H 1/20
·  ·  ·  Bridging contacts
 H01H 1/22
·  ·  ·  with rigid pivoted member carrying the moving contact
 H01H 1/24
·  ·  ·  with resilient mounting
 H01H 1/26
·  ·  ·  ·  with spring blade support
 H01H 1/28
·  ·  ·  ·  ·  Assembly of three or more contact-supporting spring blades
 H01H 1/30
·  ·  ·  ·  within supporting guides
 H01H 1/32
·  ·  ·  Self-aligning contacts
 H01H 1/34
·  ·  ·  with provision for adjusting position of contact relative to its co-operating contact
 H01H 1/36
·  ·  by sliding (by rolling or wrapping H01H 1/16)
 H01H 1/38
·  ·  ·  Plug-and-socket contacts
 H01H 1/40
·  ·  ·  Contact mounted so that its contact-making surface is flush with adjoining insulation
 H01H 1/42
·  ·  ·  Knife-and-clip contacts
 H01H 1/44
·  ·  ·  with resilient mounting
 H01H 1/46
·  ·  ·  Self-aligning contacts
 H01H 1/48
·  ·  ·  with provision for adjusting position of contact relative to its co-operating contact
 H01H 1/50
·  Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
 H01H 1/52
·  ·  Contacts adapted to act as latches
 H01H 1/54
·  ·  by magnetic force
 H01H 1/56
·  Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
 H01H 1/58
·  Electric connections to or between contacts; Terminals (electric connections in general H01R)
 H01H 1/60
·  Auxiliary means structurally associated with the switch for cleaning or lubricating contact-making surfaces (cleaning by normal sliding of contacts H01H 1/18, H01H 1/36)
 H01H 1/62
·  Heating or cooling of contacts
 H01H 1/64
·  Protective enclosures, baffle plates, or screens for contacts (for arc-extinguishing H01H 9/30; for mercury contacts H01H 29/04)
 H01H 1/66
·  ·  Contacts sealed in an evacuated or gas-filled envelope, e.g. magnetic dry-reed contacts
 H01H 3/00
Mechanisms for operating contacts (snap-action arrangements H01H 5/00; devices for introducing a predetermined time delay H01H 7/00; thermal actuating or release means H01H 37/02)
 H01H 3/02
·  Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
 H01H 3/04
·  ·  Levers (tumblers H01H 23/14)
 H01H 3/06
·  ·  ·  Means for securing to shaft of driving mechanism
 H01H 3/08
·  ·  Turn knobs
 H01H 3/10
·  ·  ·  Means for securing to shaft of driving mechanism
 H01H 3/12
·  ·  Push-buttons
 H01H 3/14
·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 3/16
·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
 H01H 3/18
·  ·  ·  the movement in one direction being intentionally by hand, e.g. for setting automatically cancelled trafficators
 H01H 3/20
·  ·  wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling
 H01H 3/22
·  Power arrangements internal to the switch for operating the driving mechanism
 H01H 3/24
·  ·  using pneumatic or hydraulic actuator
 H01H 3/26
·  ·  using dynamo-electric motor (for storing energy in a spring motor H01H 3/30)
 H01H 3/28
·  ·  using electromagnet (for storing energy in a spring motor H01H 3/30; for operating relays H01H 45/00)
 H01H 3/30
·  ·  using spring motor
 H01H 3/32
·  Driving mechanisms, i.e. for transmitting driving force to the contacts (snap-action arrangements H01H 5/00; introducing a predetermined time delay H01H 7/00)
 H01H 3/34
·  ·  using ratchet
 H01H 3/36
·  ·  using belt, chain, or cord
 H01H 3/38
·  ·  using spring or other flexible shaft coupling
 H01H 3/40
·  ·  using friction, toothed, or screw-and-nut gearing
 H01H 3/42
·  ·  using cam or eccentric
 H01H 3/44
·  ·  using Geneva movement
 H01H 3/46
·  ·  using rod or lever linkage, e.g. toggle
 H01H 3/48
·  ·  using lost-motion device
 H01H 3/50
·  ·  with indexing or locating means, e.g. indexing by ball and spring
 H01H 3/52
·  ·  with means to ensure stopping at intermediate operative positions
 H01H 3/54
·  Mechanisms for coupling or uncoupling operating parts, driving mechanisms, or contacts
 H01H 3/56
·  ·  using electromagnetic clutch
 H01H 3/58
·  ·  using friction, toothed, or other mechanical clutch
 H01H 3/60
·  Mechanical arrangements for preventing or damping vibration or shock
 H01H 3/62
·  Lubricating means structurally associated with the switch (for lubricating contact-making surfaces H01H 1/60)
 H01H 5/00
Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
 H01H 5/02
·  Energy stored by the attraction or repulsion of magnetic parts
 H01H 5/04
·  Energy stored by deformation of elastic members (by deformation of bimetallic element in thermally-actuated switches H01H 37/54)
 H01H 5/06
·  ·  by compression or extension of coil springs
 H01H 5/08
·  ·  ·  one end of spring transmitting movement to the contact member when the other end is moved by the operating part
 H01H 5/10
·  ·  ·  one end of spring being fixedly connected to the stationary or movable part of the switch, and the other end reacting with a movable or stationary rigid member respectively through pins, cams, toothed, or other shaped surfaces
 H01H 5/12
·  ·  ·  having two or more snap-action motions in succession
 H01H 5/14
·  ·  by twisting of torsion members
 H01H 5/16
·  ·  ·  with auxiliary means for temporarily holding parts until torsion member is sufficiently strained
 H01H 5/18
·  ·  by flexing of blade springs
 H01H 5/20
·  ·  ·  single blade moved across dead-centre position
 H01H 5/22
·  ·  ·  blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
 H01H 5/24
·  ·  ·  ·  having three legs
 H01H 5/26
·  ·  ·  having two or more snap-action motions in succession
 H01H 5/28
·  ·  ·  two separate blade springs forming a toggle
 H01H 5/30
·  ·  by buckling of disc springs
 H01H 7/00
Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts (time or time-programme switches H01H 43/00)
 H01H 7/02
·  with fluid timing means
 H01H 7/03
·  ·  with dash-pots
 H01H 7/04
·  ·  with flies, i.e. fan governors
 H01H 7/06
·  with thermal timing means (thermally-actuated switches H01H 37/00)
 H01H 7/08
·  with timing by mechanical speed-control devices
 H01H 7/10
·  ·  by escapement
 H01H 7/12
·  ·  ·  mechanical
 H01H 7/14
·  ·  ·  electromagnetic
 H01H 7/16
·  Devices for ensuring operation of the switch at a predetermined point in the ac cycle (circuit arrangements H01H 9/56)
 H01H 9/00
Details of switching devices, not covered by groups H01H 1/00, H01H 3/00, H01H 5/00, H01H 7/00 (casings for switchgear H02B 1/08; casings for electrical apparatus in general H05K 5/00)
 H01H 9/02
·  Bases, casings, or covers (accommodating more than one switch or a switch and another electrical component H02B 1/08)
 H01H 9/04
·  ·  Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
 H01H 9/06
·  ·  Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
 H01H 9/08
·  Arrangements to facilitate replacement of switch, e.g. cartridge housing
 H01H 9/10
·  Adaptation for built-in fuses (mounting switch and fuse separately on or in common support H02B)
 H01H 9/12
·  Means for earthing parts of switch not normally conductively connected to the contacts
 H01H 9/14
·  Adaptation for built-in safety spark gaps
 H01H 9/16
·  Indicators for switching condition, e.g. "on" or "off"
 H01H 9/18
·  Distinguishing marks on switches, e.g. for indicating switch location in the dark; Adaptation of switches to receive distinguishing marks
 H01H 9/20
·  Interlocking, locking, or latching mechanisms (contacts adapted to act as latches H01H 1/52; by an auxiliary movement of the operating part or an attachment thereto H01H 3/20)
 H01H 9/22
·  ·  for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
 H01H 9/24
·  ·  for interlocking two or more parts of the mechanism for operating contacts
 H01H 9/26
·  ·  for interlocking two or more switches (by a detachable member H01H 9/28)
 H01H 9/28
·  ·  for locking switch parts by a key or equivalent removable member (switches operated by a key H01H 27/00; locking by removable part of two-part coupling device H01R)
 H01H 9/30
·  Means for extinguishing or preventing arc between current-carrying parts
 H01H 9/32
·  ·  Insulating body insertable between contacts
 H01H 9/34
·  ·  Stationary parts for restricting or subdividing the arc, e.g. barrier plate
 H01H 9/36
·  ·  ·  Metal parts
 H01H 9/38
·  ·  Auxiliary contacts on to which the arc is transferred from the main contacts (using arcing-horns H01H 9/46)
 H01H 9/40
·  ·  Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
 H01H 9/42
·  ·  Impedances connected with contacts
 H01H 9/44
·  ·  using blow-out magnet
 H01H 9/46
·  ·  using arcing horn (using blow-out magnet H01H 9/44; arcing horns H01T 17/00)
 H01H 9/48
·  Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
 H01H 9/50
·  Means for detecting the presence of an arc or discharge
 H01H 9/52
·  Cooling of switch parts (cooling of contacts H01H 1/62)
 H01H 9/54
·  Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
 H01H 9/56
·  ·  for ensuring operation of the switch at a predetermined point in the ac cycle
 H01H 11/00
Apparatus or processes specially adapted for the manufacture of electric switches
 H01H 11/02
·  for mercury switches
 H01H 11/04
·  of switch contacts
 H01H 11/06
·  ·  Fixing of contacts to carrier
 H01H 13/00
Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch (wherein the operating part is flexible H01H 17/00)
 H01H 13/02
·  Details
 H01H 13/04
·  ·  Cases; Covers
 H01H 13/06
·  ·  ·  Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
 H01H 13/08
·  ·  ·  Casing of switch constituted by a handle serving a purpose other than the actuation of the switch
 H01H 13/10
·  ·  Bases; Stationary contacts mounted thereon
 H01H 13/12
·  ·  Movable parts; Contacts mounted thereon
 H01H 13/14
·  ·  ·  Operating parts, e.g. push-button
 H01H 13/16
·  ·  ·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 13/18
·  ·  ·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 13/20
·  ·  ·  Driving mechanisms
 H01H 13/22
·  ·  ·  ·  acting with snap action (depending upon deformation of elastic members H01H 13/26)
 H01H 13/24
·  ·  ·  ·  with means for introducing a predetermined time delay
 H01H 13/26
·  ·  Snap-action arrangements depending upon deformation of elastic members
 H01H 13/28
·  ·  ·  using compression or extension of coil springs
 H01H 13/30
·  ·  ·  ·  one end of spring transmitting movement to the contact member when the other end is moved by the operating part
 H01H 13/32
·  ·  ·  ·  one end of spring being fixedly connected to the stationary or movable part of the switch and the other end reacting with a movable or stationary rigid member respectively through pins, cams, toothed, or other shaped surfaces
 H01H 13/34
·  ·  ·  ·  having two or more snap-action motions in succession
 H01H 13/36
·  ·  ·  using flexing of blade springs
 H01H 13/38
·  ·  ·  ·  Single blade moved across dead-centre position
 H01H 13/40
·  ·  ·  ·  Blade spring with at least one snap-acting leg and at least one separate contact-carrying or contact-actuating leg
 H01H 13/42
·  ·  ·  ·  ·  having three legs
 H01H 13/44
·  ·  ·  ·  having two or more snap-action motions in succession
 H01H 13/46
·  ·  ·  ·  Two separate blade springs forming a toggle
 H01H 13/48
·  ·  ·  using buckling of disc springs
 H01H 13/50
·  having a single operating member
 H01H 13/52
·  ·  the contact returning to its original state immediately upon removal of operating force, e.g. bell push switch
 H01H 13/54
·  ·  the contact returning to its original state a predetermined time interval after removal of operating force, e.g. for staircase lighting
 H01H 13/56
·  ·  the contact returning to its original state upon the next application of operating force
 H01H 13/58
·  ·  ·  with contact-driving member rotated step-wise in one direction
 H01H 13/60
·  ·  ·  with contact-driving member moved alternately in opposite directions
 H01H 13/62
·  ·  the contact returning to its original state upon manual release of a latch (latch released by second push-button H01H 13/68)
 H01H 13/64
·  ·  wherein the switch has more than two electrically distinguishable positions, e.g. multi-position push-button switches
 H01H 13/66
·  ·  ·  the operating member having only two positions
 H01H 13/68
·  having two operating members, one for opening and one for closing the same set of contacts (single operating member protruding from different sides of switch casing for alternate pushing upon opposite ends H01H 15/22)
 H01H 13/70
·  having a plurality of operating members associated with different sets of contacts (mounting together a plurality of independent switches H02B)
 H01H 13/72
·  ·  wherein the switch has means for limiting the number of operating members that can concurrently be in the actuated position
 H01H 13/74
·  ·  ·  each contact set returning to its original state only upon actuation of another of the operating members
 H01H 13/76
·  ·  wherein some or all of the operating members actuate different combinations of the contact sets, e.g. ten operating members actuating different combinations of four contact sets
 H01H 15/00
Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
 H01H 15/02
·  Details
 H01H 15/04
·  ·  Stationary parts; Contacts mounted thereon
 H01H 15/06
·  ·  Movable parts; Contacts mounted thereon
 H01H 15/08
·  ·  ·  Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
 H01H 15/10
·  ·  ·  Operating parts
 H01H 15/12
·  ·  ·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 15/14
·  ·  ·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 15/16
·  ·  ·  Driving mechanisms
 H01H 15/18
·  ·  ·  ·  acting with snap action
 H01H 15/20
·  ·  ·  ·  with means for introducing a predetermined time delay
 H01H 15/22
·  having a single operating part protruding from different sides of switch casing for alternate actuation from opposite ends
 H01H 15/24
·  having a single operating part only protruding from one side of the switch casing for alternate pushing and pulling
 H01H 17/00
Switches having flexible operating part adapted only for pulling, e.g. cord, chain
 H01H 17/02
·  Details
 H01H 17/04
·  ·  Stationary parts (guides H01H 17/14)
 H01H 17/06
·  ·  Movable parts (guides H01H 17/14)
 H01H 17/08
·  ·  ·  Operating part, e.g. cord
 H01H 17/10
·  ·  ·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 17/12
·  ·  ·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 17/14
·  ·  Guiding means for flexible operating part
 H01H 17/16
·  having a single flexible operating part adapted for pulling at one end only
 H01H 17/18
·  ·  secured to a part of the switch driving mechanism that has only angular movement
 H01H 17/20
·  ·  ·  the contact returning to its original state immediately upon removal of operating force
 H01H 17/22
·  ·  ·  the contact returning to its original state upon the next application of operating force
 H01H 17/24
·  ·  secured to a part of the switch driving mechanism that has both angular and rectilinear motion
 H01H 17/26
·  having two flexible operating parts; having a single operating part adapted for pulling at both ends
 H01H 17/28
·  ·  secured to a part or parts of the switch driving mechanism having only rectilinear motion
 H01H 17/30
·  ·  secured to a part or parts of the switch driving mechanism having only angular motion
 H01H 19/00
Switches operated by angular displacement of the operating part thereof acted upon directly by a solid body external to the switch, e.g. by a hand, wherein this part may be turned through an unlimited or unspecified angle (rotary current collectors, distributors, or interrupters H01R 39/00)
 H01H 19/02
·  Details
 H01H 19/04
·  ·  Cases; Covers
 H01H 19/06
·  ·  ·  Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
 H01H 19/08
·  ·  Bases; Stationary contacts mounted thereon
 H01H 19/10
·  ·  Movable parts; Contacts mounted thereon
 H01H 19/12
·  ·  ·  Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
 H01H 19/14
·  ·  ·  Operating parts, e.g. turn knob
 H01H 19/16
·  ·  ·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 19/18
·  ·  ·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 19/20
·  ·  ·  Driving mechanisms allowing angular displacement of the operating part to be effective in either direction
 H01H 19/22
·  ·  ·  ·  incorporating lost motion
 H01H 19/24
·  ·  ·  ·  acting with snap action
 H01H 19/26
·  ·  ·  ·  with means for introducing a predetermined time delay
 H01H 19/28
·  ·  ·  Driving mechanisms allowing angular displacement of the operating part to be effective or possible in only one direction
 H01H 19/30
·  ·  ·  ·  incorporating lost motion
 H01H 19/32
·  ·  ·  ·  acting with snap action
 H01H 19/34
·  ·  ·  ·  with means for introducing a predetermined time delay
 H01H 19/36
·  the operating part having only two operative positions, e.g. relatively displaced by 180°
 H01H 19/38
·  ·  Change-over switches
 H01H 19/40
·  ·  ·  having only axial contact pressure
 H01H 19/42
·  ·  providing more than two electrically-different conditions, e.g. for closing either or both of two circuits
 H01H 19/44
·  ·  ·  having only axial contact pressure
 H01H 19/46
·  the operating part having three operative positions, e.g. off-star-delta
 H01H 19/48
·  ·  having only axial contact pressure
 H01H 19/50
·  the operating part having four operative positions, e.g. off /two-in-series/one-only/two-in-parallel
 H01H 19/52
·  ·  having only axial contact pressure
 H01H 19/54
·  the operating part having at least five or an unspecified number of operative positions
 H01H 19/56
·  ·  Angularly-movable actuating part carrying contacts, e.g. drum switch
 H01H 19/58
·  ·  ·  having only axial contact pressure, e.g. disc switch, wafer switch
 H01H 19/60
·  ·  Angularly-movable actuating part carrying no contacts
 H01H 19/62
·  ·  ·  Contacts actuated by radial cams
 H01H 19/64
·  Encased switches adapted for ganged operation when assembled in a line with identical switches, e.g. stacked switches
 H01H 21/00
Switches operated by angular displacement of the operating part thereof acted upon directly by a solid body, e.g. by a hand, wherein this part may be turned through a restricted angle only (tumbler switches H01H 23/00)
 H01H 21/02
·  Details
 H01H 21/04
·  ·  Cases; Covers
 H01H 21/06
·  ·  ·  interlocked with operating mechanism
 H01H 21/08
·  ·  ·  Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
 H01H 21/10
·  ·  ·  Casing of switch constituted by a handle serving a purpose other than the actuation of the switch
 H01H 21/12
·  ·  Bases; Stationary contacts mounted thereon
 H01H 21/14
·  ·  Means for increasing contact pressure
 H01H 21/16
·  ·  Adaptation for built-in fuse
 H01H 21/18
·  ·  Movable parts; Contacts mounted thereon
 H01H 21/20
·  ·  ·  Contact arrangements for providing make-before-break operation, e.g. for on-load tap-changing
 H01H 21/22
·  ·  ·  Operating parts, e.g. handle
 H01H 21/24
·  ·  ·  ·  biased to return to normal position upon removal of operating force
 H01H 21/26
·  ·  ·  ·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 21/28
·  ·  ·  ·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 21/30
·  ·  ·  ·  not biased to return to normal position upon removal of operating force
 H01H 21/32
·  ·  ·  ·  ·  adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 21/34
·  ·  ·  ·  ·  adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 21/36
·  ·  ·  Driving mechanisms
 H01H 21/38
·  ·  ·  ·  incorporating lost motion
 H01H 21/40
·  ·  ·  ·  having snap action
 H01H 21/42
·  ·  ·  ·  ·  produced by compression or extension of coil spring
 H01H 21/44
·  ·  ·  ·  ·  produced by flexing blade springs
 H01H 21/46
·  ·  ·  ·  ·  with two or more snap-action motions in succession
 H01H 21/48
·  ·  ·  ·  incorporating a ratchet mechanism
 H01H 21/50
·  ·  ·  ·  with indexing or latching means, e.g. indexing by ball and spring; with means to ensure stopping at intermediate operative positions
 H01H 21/52
·  ·  ·  ·  with means for introducing a predetermined time delay
 H01H 21/54
·  Lever switches with blade-type contact co-operating with one or two spring-clip contacts, e.g. knife switch
 H01H 21/56
·  ·  making contact in one position only
 H01H 21/58
·  ·  Change-over switches without stable intermediate position
 H01H 21/60
·  ·  Change-over switches with stable intermediate position
 H01H 21/62
·  Switches with moving contact sliding over stud contacts
 H01H 21/64
·  ·  with two operative positions, e.g. on/off
 H01H 21/66
·  ·  ·  having only axial contact pressure
 H01H 21/68
·  ·  with three operative positions, e.g. change-over switch with stable intermediate position
 H01H 21/70
·  ·  ·  having only axial contact pressure
 H01H 21/72
·  ·  with four operative positions
 H01H 21/74
·  ·  ·  having only axial contact pressure
 H01H 21/76
·  ·  with at least five or an unspecified number of operative positions, e.g. drum switch
 H01H 21/78
·  ·  ·  having only axial contact pressure, e.g. face-plate switch
 H01H 21/80
·  Switches with angularly-movable actuating part carrying no contacts
 H01H 21/82
·  ·  Contacts actuated by radial cams
 H01H 21/84
·  ·  Contacts actuated by rectilinearly-movable member linked to operating part, e.g. by pin and slot
 H01H 21/86
·  Switches with abutting contact carried by operating part, e.g. telegraph tapping key
 H01H 21/88
·  ·  with intermediate position of rest
 H01H 23/00
Tumbler switches, i.e. actuated by digitally rocking a part of the switch in one plane only
 H01H 23/02
·  Details
 H01H 23/04
·  ·  Cases; Covers
 H01H 23/06
·  ·  ·  Dustproof, splashproof, drip-proof, or flameproof casings
 H01H 23/08
·  ·  Bases; Stationary contacts mounted thereon
 H01H 23/10
·  ·  Adaptation for built-in fuse
 H01H 23/12
·  ·  Movable parts; Contacts mounted thereon
 H01H 23/14
·  ·  ·  Tumblers
 H01H 23/16
·  ·  ·  Driving mechanisms
 H01H 23/18
·  ·  ·  ·  incorporating lost motion
 H01H 23/20
·  ·  ·  ·  having snap action
 H01H 23/22
·  ·  ·  ·  with means for introducing a predetermined time delay
 H01H 23/24
·  with two operating positions
 H01H 23/26
·  ·  one of which positions is unstable
 H01H 23/28
·  with three operating positions
 H01H 23/30
·  ·  with stable centre position and one or both end positions unstable
 H01H 25/00
Switches with compound movement of handle or other operating part
 H01H 25/04
·  Operating part movable angularly in more than one plane, e.g. joy-stick
 H01H 25/06
·  Operating part movable both angularly and rectilinearly, the rectilinear movement being along the axis of angular movement
 H01H 27/00
Switches operated by a removable member, e.g. key, plug, plate; Switches operated by setting members according to a single predetermined combination out of several possible settings (locking switch parts to prevent operation H01H 9/28; combined with plug-and-socket connectors H01R; with current-carrying plug H01R 31/08)
 H01H 27/04
·  Insulating plug or plate inserted between normally-closed contacts
 H01H 27/06
·  Key inserted and then turned to effect operation of the switch
 H01H 27/08
·  ·  wherein the key cannot be removed until the switch is returned to its original position
 H01H 27/10
·  Switch operated by setting members according to a single predetermined combination out of several possible settings
 H01H 29/00
Switches having at least one liquid contact (solid contacts wetted or soaked with mercury H01H 1/08)
 H01H 29/02
·  Details
 H01H 29/04
·  ·  Contacts; Containers for liquid contacts
 H01H 29/06
·  ·  ·  Liquid contacts characterised by the material thereof
 H01H 29/08
·  ·  Means for introducing a predetermined time delay
 H01H 29/10
·  ·  ·  by constricting the flow of the contact liquid
 H01H 29/12
·  ·  Operating mechanisms adapted for operation by a part of the human body other than the hand, e.g. by foot
 H01H 29/14
·  ·  Operating mechanisms adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
 H01H 29/16
·  operated by dipping solid contact into stationary contact liquid
 H01H 29/18
·  with level of surface of contact liquid displaced by non-electrical contact-making plunger
 H01H 29/20
·  operated by tilting contact-liquid container (centrifugal mercury switches H01H 29/26)
 H01H 29/22
·  ·  wherein contact is made and broken between liquid and solid
 H01H 29/24
·  ·  wherein contact is made and broken between liquid and liquid
 H01H 29/26
·  with level of surface of contact liquid displaced by centrifugal action
 H01H 29/28
·  with level of surface of contact liquid displaced by fluid pressure
 H01H 29/30
·  with level of surface of contact liquid displaced by expansion or evaporation thereof
 H01H 29/32
·  with contact made by a liquid jet, e.g. earthing switch with contact made by jet of water (operated by direct electrodynamic action H01H 53/00)
 H01H 31/00
Off-load air-break disconnecting or isolating switches for high-tension circuits; On-load air-break switches for high-tension without arc-extinguishing or arc-preventing means (switchgear H02B)
 H01H 31/02
·  Details
 H01H 31/04
·  ·  Interlocking mechanisms (for interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means H01H 33/52)
 H01H 31/06
·  ·  ·  for interlocking between casing, cover, or protective shutter and mechanism for operating contacts
 H01H 31/08
·  ·  ·  for interlocking two or more parts of the mechanism for operating contacts
 H01H 31/10
·  ·  ·  for interlocking two or more switches (for interlocking with high-tension or heavy-current switches having arc-extinguishing or arc-preventing means H01H 33/52)
 H01H 31/12
·  ·  Adaptation for built-in fuse
 H01H 31/14
·  with bridging contact that is not electrically connected to either line contact in open position of switch
 H01H 31/16
·  ·  with angularly-movable bridging contact or contact-carrying member
 H01H 31/18
·  ·  ·  actuated through the movement of one or more insulators
 H01H 31/20
·  ·  ·  ·  at least one insulator being rotatable about its own geometrical axis
 H01H 31/22
·  ·  ·  wherein the contact or contacts are rectilinearly movable with respect to the carrying member
 H01H 31/24
·  ·  with rectilinearly-movable bridging contact
 H01H 31/26
·  with movable contact that remains electrically connected to one line in open position of switch
 H01H 31/28
·  ·  with angularly-movable contact
 H01H 31/30
·  ·  ·  actuated-through the movement of one or more insulators
 H01H 31/32
·  ·  with rectilinearly-movable contact
 H01H 31/34
·  with movable contact adapted to engage an overhead transmission line, e.g. for branching
 H01H 31/36
·  ·  contact moved by pantograph
 H01H 33/00
High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
 H01H 33/02
·  Details
 H01H 33/04
·  ·  Means for extinguishing or preventing arc between current-carrying parts (for switches in general H01H 9/30)
 H01H 33/06
·  ·  ·  Insulating body insertable between contacts
 H01H 33/08
·  ·  ·  Stationary parts for restricting or subdividing the arc, e.g. barrier plate
 H01H 33/10
·  ·  ·  ·  Metal parts
 H01H 33/12
·  ·  ·  Auxiliary contacts on to which the arc is transferred from the main contacts (using arcing horns H01H 33/20)
 H01H 33/14
·  ·  ·  Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
 H01H 33/16
·  ·  ·  Impedances connected with contacts
 H01H 33/18
·  ·  ·  using blow-out magnet
 H01H 33/20
·  ·  ·  using arcing horns (using blow-out magnet H01H 33/18; arcing horns H01T 17/00)
 H01H 33/22
·  ·  ·  Selection of fluids for arc-extinguishing
 H01H 33/24
·  ·  Means for preventing discharge to non-current-carrying parts, e.g. using corona ring
 H01H 33/26
·  ·  Means for detecting the presence of an arc or other discharge
 H01H 33/28
·  ·  Power arrangements internal to the switch for operating the driving mechanism
 H01H 33/30
·  ·  ·  using fluid actuator
 H01H 33/32
·  ·  ·  ·  pneumatic
 H01H 33/34
·  ·  ·  ·  hydraulic
 H01H 33/36
·  ·  ·  using dynamo-electric motor (for storing energy in a spring motor H01H 33/40)
 H01H 33/38
·  ·  ·  using electromagnet (for storing energy in a spring motor H01H 33/40)
 H01H 33/40
·  ·  ·  using spring motor
 H01H 33/42
·  ·  Driving mechanisms
 H01H 33/44
·  ·  Devices for ensuring operation of the switch at a predetermined point in the ac cycle (circuit arrangements H01H 33/59)
 H01H 33/46
·  ·  Interlocking mechanisms
 H01H 33/48
·  ·  ·  for interlocking between casing or cover and mechanism for operating contacts
 H01H 33/50
·  ·  ·  for interlocking two or more parts of the mechanism for operating contacts
 H01H 33/52
·  ·  ·  for interlocking two or more switches
 H01H 33/54
·  ·  Reservoirs, tanks, piping or valves, for arc-extinguishing fluid; Safety arrangements therefor, e.g. pressure relief devices
 H01H 33/55
·  ·  ·  Oil reservoirs or tanks; Lowering means therefor (associated with withdrawal mechanism for isolation of switch H02B 11/08)
 H01H 33/56
·  ·  ·  Gas reservoirs
 H01H 33/57
·  ·  ·  Recuperation of liquid or gas
 H01H 33/58
·  ·  Silencers for suppressing noise of switch operation
 H01H 33/59
·  ·  Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
 H01H 33/60
·  Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
 H01H 33/62
·  ·  wherein the break is in air at atmospheric pressure, e.g. in open air
 H01H 33/64
·  ·  wherein the brake is in gas (in air at atmospheric pressure H01H 33/62; vacuum switches H01H 33/66)
 H01H 33/66
·  ·  Vacuum switches
 H01H 33/68
·  ·  Liquid-break switches, e.g. oil-break
 H01H 33/70
·  Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid
 H01H 33/72
·  ·  having stationary parts for directing the flow of arc-extinguishing fluid, e.g. arc-extinguishing chamber
 H01H 33/73
·  ·  ·  wherein the break is in air at atmospheric pressure, e.g. in open air
 H01H 33/74
·  ·  ·  wherein the break is in gas (in air at atmospheric pressure H01H 33/73)
 H01H 33/75
·  ·  ·  Liquid-break switches, e.g. oil-break
 H01H 33/76
·  ·  wherein arc-extinguishing gas is evolved from stationary parts
 H01H 33/77
·  ·  ·  wherein the break is in air at atmospheric pressure
 H01H 33/78
·  ·  ·  wherein the break is in gas (in air at atmospheric pressure H01H 33/77)
 H01H 33/80
·  ·  flow of arc-extinguishing fluid from a pressure source being controlled by a valve
 H01H 33/82
·  ·  ·  the fluid being air or gas
 H01H 33/83
·  ·  ·  ·  wherein the contacts are opened by the flow of air or gas
 H01H 33/84
·  ·  ·  the fluid being liquid, e.g. oil
 H01H 33/85
·  ·  ·  ·  wherein the contacts are opened by the flow of liquid
 H01H 33/86
·  ·  Flow of arc-extinguishing fluid under pressure from the contact space controlled by a valve
 H01H 33/88
·  ·  Flow of arc-extinguishing fluid produced or increased by movement of pistons or other pressure-producing parts
 H01H 33/90
·  ·  ·  this movement being effected by, or in conjunction with, the contact-operating mechanism
 H01H 33/91
·  ·  ·  ·  the arc-extinguishing fluid being air or gas
 H01H 33/92
·  ·  ·  ·  the arc-extinguishing fluid being liquid, e.g. oil
 H01H 33/94
·  ·  ·  this movement being effected solely due to the pressure caused by the arc itself or by an auxiliary arc
 H01H 33/95
·  ·  ·  ·  the arc-extinguishing fluid being air or gas
 H01H 33/96
·  ·  ·  ·  the arc-extinguishing fluid being liquid, e.g. oil
 H01H 33/98
·  ·  Flow of arc-extinguishing fluid initiated by an auxiliary arc or a section of the arc, without any moving parts for producing or increasing the flow
 H01H 35/00
Switches operated by change of a physical condition (operated by change of magnetic or electric field H01H 36/00; thermally-actuated switches H01H 37/00; time switches H01H 43/00; relays H01H 45/00-H01H 61/00; sensing elements for providing continuous conversion of a variable into mechanical displacement G01)
 H01H 35/00

Note(s)

The physical condition by which a switching device is classified is that condition, the change of which acts as input to the device, e.g. external explosion causing pressure wave to act upon switch is classified in group H01H 35/24, an explosion produced within the switch in group H01H 37/00 if initiated by heat, in group H01H 39/00 if initiated electrically, and in group H01H 35/14 if initiated by an external blow.

 H01H 35/02
·  Switches operated by change of position, inclination, or orientation of the switch itself in relation to gravitational field (tilting mercury container H01H 29/20; change of position due to change of liquid level H01H 35/18)
 H01H 35/06
·  Switches operated by change of speed (operated by change of fluid flow H01H 35/24)
 H01H 35/10
·  ·  Centrifugal switches (level of mercury displaced by centrifugal action H01H 29/26)
 H01H 35/12
·  ·  operated by reversal of direction of movement
 H01H 35/14
·  Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
 H01H 35/18
·  Switches operated by change of liquid level or of liquid density, e.g. float switch (wherein the liquid constitutes a contact of the switch H01H 29/00; by magnet carried on a float H01H 36/02)
 H01H 35/24
·  Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow (wherein the change of pressure is caused by change of temperature H01H 37/36)
 H01H 35/26
·  ·  Details
 H01H 35/28
·  ·  ·  Compensation for variation of ambient pressure or temperature
 H01H 35/30
·  ·  ·  Means for transmitting pressure to pressure-responsive operating part, e.g. by capsule and capillary tube
 H01H 35/32
·  ·  actuated by bellows
 H01H 35/34
·  ·  actuated by diaphragm
 H01H 35/36
·  ·  actuated by curled flexible tube, e.g. Bourdon tube
 H01H 35/38
·  ·  actuated by piston and cylinder
 H01H 35/40
·  ·  actuated by devices allowing continual flow of fluid, e.g. vane
 H01H 35/42
·  Switches operated by change of humidity
 H01H 36/00
Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
 H01H 36/02
·  actuated by movement of a float carrying a magnet
 H01H 37/00
Thermally-actuated switches (electrothermal relays operated by electrical input H01H 61/00; protective switches with electrothermal release or actuation H01H 73/00-H01H 83/00)
 H01H 37/02
·  Details
 H01H 37/04
·  ·  Bases; Housings; Mountings
 H01H 37/06
·  ·  ·  to facilitate replacement, e.g. cartridge housing
 H01H 37/08
·  ·  Indicators; Distinguishing marks
 H01H 37/10
·  ·  Compensation for variation of ambient temperature or pressure
 H01H 37/12
·  ·  Means for adjustment of "on" or "off" operating temperature
 H01H 37/14
·  ·  ·  by anticipatory electric heater
 H01H 37/16
·  ·  ·  by varying the proportion of input heat received by the thermal element, e.g. by displacement of a shield
 H01H 37/18
·  ·  ·  by varying bias on the thermal element due to a separate spring
 H01H 37/20
·  ·  ·  by varying the position of the thermal element in relation to switch base or casing
 H01H 37/22
·  ·  ·  by adjustment of a member transmitting motion from the thermal element to contacts or latch
 H01H 37/24
·  ·  ·  by adjustment of position of the movable contact on its driving member
 H01H 37/26
·  ·  ·  by adjustment of abutment for "off" position of the movable contact
 H01H 37/28
·  ·  ·  by adjustment of the position of the fixed contact
 H01H 37/30
·  ·  ·  by varying the position of the contact unit in relation to switch base or casing
 H01H 37/32
·  ·  Thermally-sensitive members (temperature-responsive elements in general G01K)
 H01H 37/34
·  ·  ·  Means for transmitting heat thereto, e.g. capsule remote from contact member
 H01H 37/36
·  ·  ·  actuated due to expansion or contraction of a fluid with or without vaporisation (the fluid forming a contact of the switch H01H 29/04, H01H 29/30)
 H01H 37/38
·  ·  ·  ·  with bellows
 H01H 37/40
·  ·  ·  ·  with diaphragm
 H01H 37/42
·  ·  ·  ·  with curled flexible tube, e.g. Bourdon tube
 H01H 37/44
·  ·  ·  ·  with piston and cylinder
 H01H 37/46
·  ·  ·  actuated due to expansion or contraction of a solid (deflection of a bimetallic element H01H 37/52)
 H01H 37/48
·  ·  ·  ·  with extensible rigid rods or tubes
 H01H 37/50
·  ·  ·  ·  with extensible wires under tension
 H01H 37/52
·  ·  ·  actuated due to deflection of bimetallic element
 H01H 37/54
·  ·  ·  ·  wherein the bimetallic element is inherently snap acting
 H01H 37/56
·  ·  ·  ·  having spirally wound or helically wound bimetallic element
 H01H 37/58
·  ·  ·  actuated due to thermally controlled change of magnetic permeability
 H01H 37/60
·  ·  Means for producing snap action (inherent in bimetallic element H01H 37/54; caused by a magnet H01H 37/66)
 H01H 37/62
·  ·  Means other than thermal means for introducing a predetermined time delay
 H01H 37/64
·  ·  Contacts
 H01H 37/66
·  ·  ·  Magnetic reinforcement of contact pressure; Magnet causing snap action
 H01H 37/68
·  ·  ·  sealed in evacuated or gas-filled tube
 H01H 37/70
·  ·  ·  Resetting means
 H01H 37/72
·  Switches in which the opening movement and the closing movement of a contact are effected respectively by heating and cooling or vice versa
 H01H 37/74
·  Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling (for the electrical protection of electric lines or electric apparatus H01H 73/00-H01H 83/00)
 H01H 37/76
·  ·  Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material (fuses H01H 85/00)
 H01H 39/00
Switching devices actuated by an explosion produced within the device and initiated by an electric current
 H01H 41/00
Switches providing a selected number of consecutive operations of the contacts by a single manual actuation of the operating part (for telephone communication H04M 1/26)
 H01H 41/04
·  Switches without means for setting or mechanically storing a multidigit number
 H01H 41/06
·  ·  dial or slide operated
 H01H 41/08
·  ·  keyboard operated
 H01H 41/10
·  Switches with means for setting or mechanically storing a multidigit number
 H01H 41/12
·  ·  dial or slide operated
 H01H 41/14
·  ·  keyboard operated
 H01H 43/00
Time or time-programme switches i.e. switches which have not only a time-delay action between opening and closing of contacts, but also provide a choice of time intervals for executing one or more switching operations (electric clocks G04C; use of time switches for indicating the time or producing time signals electrically G04C 17/00-G04C 21/00; clocks as such modified to incorporate electric switches G04C 23/00; for controlling operations G05B)
 H01H 43/02
·  Details
 H01H 43/04
·  ·  Means for time setting
 H01H 43/06
·  ·  ·  comprising separately adjustable parts for each programme step, e.g. with tappets
 H01H 43/08
·  ·  ·  comprising an interchangeable programme part which is common for all programme steps, e.g. with a punched card
 H01H 43/10
·  with timing of actuation of contacts due to a part rotating at substantially constant speed
 H01H 43/12
·  ·  stopping automatically after a single cycle of operation
 H01H 43/14
·  ·  ·  wherein repetition of operation necessitates resetting of time intervals
 H01H 43/16
·  ·  stopping automatically after a predetermined plurality of cycles of operation
 H01H 43/18
·  ·  operating continuously after starting or putting into service and continuing to operate until stopped by external intervention
 H01H 43/20
·  ·  ·  with a twenty-four-hour cycle of operation
 H01H 43/22
·  ·  ·  ·  with automatic adjustment of time intervals throughout the year, e.g. for street lighting
 H01H 43/24
·  with timing of actuation of contacts due to a non-rotatably moving part
 H01H 43/26
·  ·  the actuation being produced by a substance flowing due to gravity, e.g. sand, water
 H01H 43/28
·  ·  the actuation being produced by a part, the speed of which is controlled by fluid-pressure means, e.g. by piston and cylinder
 H01H 43/30
·  with timing of actuation of contacts due to thermal action
 H01H 43/32
·  with timing of actuation of contacts due to electrolytic processes; with timing of actuation of contacts due to chemical processes
 H01H 45/00 - 
H01H 67/00
Relays
 H01H 45/00
Details of relays (electric circuit arrangements H01H 47/00; of electromagnetic relays H01H 50/00; details of electrically-operated selector switches H01H 63/00)
 H01H 45/02
·  Bases; Cases; Covers (frames for mounting several relays H04Q 1/08, H05K)
 H01H 45/04
·  ·  Mounting complete relay or separate parts of relay on a base or inside a case
 H01H 45/06
·  ·  having windows; Transparent cases or covers
 H01H 45/08
·  Indicators; Distinguishing marks
 H01H 45/10
·  Electromagnetic or electrostatic shielding (cases H01H 45/02)
 H01H 45/12
·  Ventilating; Cooling; Heating (for operating electrothermal relays H 01 H 45/50)
 H01H 45/14
·  Terminal arrangements
 H01H 47/00
Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current (circuit arrangements for electromagnets in general H01F 7/18)
 H01H 47/02
·  for modifying the operation of the relay
 H01H 47/04
·  ·  for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
 H01H 47/06
·  ·  ·  by changing number of serially-connected turns or winding
 H01H 47/08
·  ·  ·  by changing number of parallel-connected turns or windings
 H01H 47/10
·  ·  ·  by switching-in or -out impedance external to the relay winding
 H01H 47/12
·  ·  for biasing the electromagnet
 H01H 47/14
·  ·  for differential operation of the relay
 H01H 47/16
·  ·  for conjoint, e.g. additive, operation of the relay
 H01H 47/18
·  ·  for introducing delay in the operation of the relay (short-circuited conducting sleeves, bands, or discs H01H 50/46)
 H01H 47/20
·  ·  for producing frequency-selective operation of the relay
 H01H 47/22
·  for supplying energising current for relay coil
 H01H 47/24
·  ·  having light-sensitive input
 H01H 47/26
·  ·  having thermo-sensitive input
 H01H 47/28
·  ·  energising current supplied by discharge tube
 H01H 47/30
·  ·  ·  by gas-filled discharge tube
 H01H 47/32
·  ·  Energising current supplied by semiconductor device
 H01H 47/34
·  ·  Energising current supplied by magnetic amplifier
 H01H 47/36
·  ·  Relay coil or coils forming part of a bridge circuit
 H01H 49/00
Apparatus or processes specially adapted to the manufacture of relays or parts thereof
 H01H 50/00
Details of electromagnetic relays (electric circuit arrangements H01H 47/00; details of electrically-operated selector switches H01H 63/00)
 H01H 50/02
·  Bases; Cases; Covers (frames for mounting several relays H04Q 1/08, H05K)
 H01H 50/04
·  ·  Mounting complete relay or separate parts of relay on a base or inside a case
 H01H 50/06
·  ·  having windows; Transparent cases or covers
 H01H 50/08
·  Indicators; Distinguishing marks
 H01H 50/10
·  Electromagnetic or electrostatic shielding (cases H01H 50/02)
 H01H 50/12
·  Ventilating; Cooling; Heating (for operating electrothermal relays H01H 61/013)
 H01H 50/14
·  Terminal arrangements
 H01H 50/16
·  Magnetic circuit arrangements (cores, yokes, or armatures in general H01F 3/00; magnets in general H01F 7/00)
 H01H 50/18
·  ·  Movable parts of magnetic circuits, e.g. armature
 H01H 50/20
·  ·  ·  movable inside coil and substantially lengthwise with respect to axis thereof; movable coaxially with respect to coil
 H01H 50/22
·  ·  ·  ·  wherein the magnetic circuit is substantially closed
 H01H 50/24
·  ·  ·  Parts rotatable or rockable outside coil
 H01H 50/26
·  ·  ·  ·  Parts movable about a knife edge
 H01H 50/28
·  ·  ·  ·  Parts movable due to bending of a blade spring or reed
 H01H 50/30
·  ·  ·  Mechanical arrangements for preventing or damping vibration or shock, e.g. by balancing of armature
 H01H 50/32
·  ·  ·  Latching movable parts mechanically
 H01H 50/34
·  ·  ·  Means for adjusting limits of movement; Mechanical means for adjusting returning force
 H01H 50/36
·  ·  Stationary parts of magnetic circuit, e.g. yoke
 H01H 50/38
·  ·  ·  Part of main magnetic circuit shaped to suppress arcing between the contacts of the relay
 H01H 50/40
·  ·  ·  Branched or multiple-limb main magnetic circuits
 H01H 50/42
·  ·  ·  Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement
 H01H 50/44
·  Magnetic coils or windings (circuit arrangements H01H 47/00; in general H01F 5/00)
 H01H 50/46
·  ·  Short-circuited conducting sleeves, bands, or discs
 H01H 50/54
·  Contact arrangements (contacts for switches in general H01H 1/00)
 H01H 50/56
·  ·  Contact spring sets
 H01H 50/58
·  ·  ·  Driving arrangements structurally associated therewith; Mounting of driving arrangement on armature
 H01H 50/60
·  ·  moving contact being rigidly combined with movable part of magnetic circuit
 H01H 50/62
·  ·  Co-operating movable contacts operated by separate electrical actuating means
 H01H 50/64
·  Driving arrangements between movable part of magnetic circuit and contact (structurally associated with contact spring sets H01H 50/58)
 H01H 50/66
·  ·  with lost motion
 H01H 50/68
·  ·  with snap action
 H01H 50/70
·  ·  operating contact momentarily during stroke of armature
 H01H 50/72
·  ·  for mercury contact
 H01H 50/74
·  ·  Mechanical means for producing a desired natural frequency of operation of the contacts, e.g. for self-interrupter
 H01H 50/76
·  ·  ·  using reed or blade spring
 H01H 50/78
·  ·  ·  using diaphragm; using stretched wire or ribbon vibrating sideways
 H01H 50/80
·  ·  ·  using torsionally vibrating member, e.g. wire, strip
 H01H 50/82
·  ·  ·  using spring-loaded pivoted inertia member
 H01H 50/84
·  ·  ·  with means for adjustment of frequency or of make-to-break ratio
 H01H 50/86
·  Means for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts (circuit arrangements for introducing delay H01H 47/18; short-circuited conducting sleeves, bands, or discs H01H 50/46)
 H01H 50/88
·  ·  Mechanical means, e.g. dash-pot
 H01H 50/90
·  ·  ·  the delay effective in both directions of operation
 H01H 50/92
·  ·  Thermal means (inherent in electrothermal relays H01H 61/00)
 H01H 51/00
Electromagnetic relays (relays using the dynamo-electric effect H01H 53/00)
 H01H 51/02
·  Non-polarised relays
 H01H 51/04
·  ·  with single armature; with single set of ganged armatures
 H01H 51/06
·  ·  ·  Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored, e.g. in a spring, during the movement in the first direction
 H01H 51/08
·  ·  ·  ·  Contacts alternately opened and closed by successive cycles of energisation and de-energisation of the electromagnet, e.g. by use of a ratchet
 H01H 51/10
·  ·  ·  ·  Contacts retained open or closed by a latch which is controlled by an electromagnet
 H01H 51/12
·  ·  ·  Armature is movable between two limit positions of rest and is moved in both directions due to the energisation of one or other of two electromagnets without the storage of energy to effect the return movement
 H01H 51/14
·  ·  ·  ·  without intermediate neutral position of rest
 H01H 51/16
·  ·  ·  ·  with intermediate neutral position of rest
 H01H 51/18
·  ·  ·  Armature is rotatable through an unlimited number of revolutions
 H01H 51/20
·  ·  with two or more independent armatures
 H01H 51/22
·  Polarised relays
 H01H 51/24
·  ·  without intermediate neutral position of rest
 H01H 51/26
·  ·  with intermediate neutral position of rest
 H01H 51/27
·  Relays with armature having two stable magnetic states and operated by change from one state to the other
 H01H 51/28
·  Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed (H01H 51/27 takes precedence)
 H01H 51/29
·  Relays having armature, contacts, and operating coil within a sealed casing (H01H 51/27 takes precedence)
 H01H 51/30
·  specially adapted for actuation by alternating current
 H01H 51/32
·  ·  Frequency relays; Mechanically-tuned relays
 H01H 51/34
·  Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
 H01H 51/36
·  ·  wherein the make-to-break ratio is varied by hand setting or current strength
 H01H 53/00
Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
 H01H 53/01
·  Details
 H01H 53/015
·  ·  Moving coils; Contact-driving arrangements associated therewith
 H01H 53/02
·  Electrodynamic relays, i.e. relays in which the interaction is between two current-carrying conductors
 H01H 53/04
·  ·  Ferrodynamic relays, i.e. relays in which the magnetic field is concentrated in ferromagnetic parts
 H01H 53/06
·  Magnetodynamic relays, i.e. relays in which the magnetic field is produced by a permanent magnet
 H01H 53/08
·  wherein a mercury contact constitutes the current-carrying conductor
 H01H 53/10
·  Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor
 H01H 53/12
·  ·  Ferraris relays
 H01H 53/14
·  Contacts actuated by an electric motor through fluid-pressure transmission, e.g. using a motor-driven pump
 H01H 55/00
Magnetostrictive relays
 H01H 57/00
Electrostrictive relays; Piezo-electric relays
 H01H 59/00
Electrostatic relays; Electro-adhesion relays (clutches in general using the Johnson-Rahbek effect H02N 13/00)
 H01H 61/00
Electrothermal relays (thermal switches not operated by electrical input, thermal switches with anticipating electrical input H01H 37/00; thermally-sensitive members H01H 37/32)
 H01H 61/01
·  Details
 H01H 61/013
·  ·  Heating arrangements for operating relays
 H01H 61/017
·  ·  ·  Heating by glow discharge or arc in confined space
 H01H 61/02
·  wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively
 H01H 61/04
·  wherein the thermally-sensitive member is only heated directly
 H01H 61/06
·  Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
 H01H 61/08
·  ·  wherein the make-to-break ratio is varied by hand setting or current strength
 H01H 63/00
Details of electrically-operated selector switches (details of relays H01H 45/00)
 H01H 63/02
·  Contacts; Wipers; Connections thereto
 H01H 63/04
·  ·  Contact-making or contact-breaking wipers; Position indicators therefor
 H01H 63/06
·  ·  Contact banks
 H01H 63/08
·  ·  ·  cylindrical
 H01H 63/10
·  ·  ·  plane
 H01H 63/12
·  ·  Multiplying connections to contact banks, e.g. using ribbon cables
 H01H 63/14
·  ·  ·  without soldering
 H01H 63/16
·  Driving arrangements for multi-position wipers
 H01H 63/18
·  ·  with step-by-step motion of wiper to a selector position
 H01H 63/20
·  ·  ·  using stepping magnet and ratchet
 H01H 63/22
·  ·  ·  using step-by-step electromagnetic drive without ratchet, e.g. self-interrupting driving magnet
 H01H 63/24
·  ·  with continuous motion of wiper until a selected position is reached
 H01H 63/26
·  ·  ·  with an individual clutch-drive from a shaft common to more than one selector switch
 H01H 63/28
·  ·  ·  with an individual motor for each selector switch
 H01H 63/30
·  ·  ·  ·  Pneumatic motor for moving wiper to selected position
 H01H 63/32
·  ·  ·  ·  Spring motor for moving wiper to selected position
 H01H 63/33
·  Constructional details of co-ordinate-type selector switches not having relays at cross-points
 H01H 63/34
·  Bases; Cases; Covers; Mountings (racks for mounting selectors with or without other exchange equipment H04Q 1/04); Mounting of fuses on selector switch
 H01H 63/36
·  Circuit arrangements for ensuring correct or desired operation and not adapted to a particular application of the selector switch
 H01H 63/38
·  ·  for multi-position wiper switches
 H01H 63/40
·  ·  for multi-position switches without wipers
 H01H 63/42
·  ·  ·  for co-ordinate-type selector switches not having relays at cross-points
 H01H 65/00
Apparatus or processes specially adapted to the manufacture of selector switches or parts thereof
 H01H 67/00
Electrically-operated selector switches (details thereof H01H 63/00; selecting per se H04Q)
 H01H 67/02
·  Multi-position wiper switches
 H01H 67/04
·  ·  having wipers movable only in one direction for purpose of selection
 H01H 67/06
·  ·  ·  Rotary switches, i.e. having angularly movable wipers
 H01H 67/08
·  ·  ·  ·  with wiper selection
 H01H 67/10
·  ·  ·  ·  with coarse and fine positioning of wipers
 H01H 67/12
·  ·  ·  Linear-motion switches
 H01H 67/14
·  ·  having wipers movable in two mutually perpendicular directions for purpose of selection
 H01H 67/16
·  ·  ·  one motion being rotary and the other being parallel to the axis of rotation, e.g. Strowger or "up and around" switches
 H01H 67/18
·  ·  ·  one motion being rotary and the other being perpendicular to the axis of rotation, e.g. "round and in" switches
 H01H 67/20
·  ·  ·  both motions being linear
 H01H 67/22
·  Switches without multi-position wipers
 H01H 67/24
·  ·  Relay switches, i.e. having individual electro-magnet for each set of contacts
 H01H 67/26
·  ·  Co-ordinate-type selector switches not having relays at cross-points but involving mechanical movement, e.g. cross-bar switch, code-bar switch
 H01H 67/30
·  ·  Co-ordinate-type selector switches with field of co-ordinate coil acting directly upon magnetic leaf spring or reed-type contact member
 H01H 67/32
·  ·  having a multiplicity of interdependent armatures operated in succession by a single coil and each controlling one contact or set of contacts, e.g. counting relay
 H01H 69/00 - 
H01H 87/00
Emergency protective devices
 H01H 69/00
Apparatus or processes for the manufacture of emergency protective devices (manufacture of switches in general H01H 11/00; manufacture of relays in general H01H 49/00)
 H01H 69/01
·  for calibrating or setting of devices to function under predetermined conditions (measuring electric values G01R)
 H01H 69/02
·  Manufacture of fuses
 H01H 71/00
Details of the protective switches and relays covered by groups H01H 73/00-H01H 83/00
 H01H 71/02
·  Housings; Casings; Bases; Mountings
 H01H 71/04
·  Means for indicating condition of the switching device
 H01H 71/06
·  Distinguishing marks, e.g. colour coding
 H01H 71/08
·  Terminals; Connections (in general H01R)
 H01H 71/10
·  Operating or release mechanisms
 H01H 71/12
·  ·  Automatic release mechanisms with or without manual release
 H01H 71/14
·  ·  ·  Electrothermal mechanisms
 H01H 71/16
·  ·  ·  ·  with bimetal element
 H01H 71/18
·  ·  ·  ·  with expanding rod, strip, or wire
 H01H 71/20
·  ·  ·  ·  with fusible mass
 H01H 71/22
·  ·  ·  ·  with compensation for variation of ambient temperature
 H01H 71/24
·  ·  ·  Electromagnetic mechanisms
 H01H 71/26
·  ·  ·  ·  with windings acting in opposition
 H01H 71/28
·  ·  ·  ·  with windings acting in conjunction
 H01H 71/30
·  ·  ·  ·  having additional short-circuited winding
 H01H 71/32
·  ·  ·  ·  having permanently magnetised part
 H01H 71/34
·  ·  ·  ·  having two or more armatures controlled by a common winding
 H01H 71/36
·  ·  ·  ·  frequency selective
 H01H 71/38
·  ·  ·  ·  wherein the magnet coil also acts as arc blow-out device
 H01H 71/40
·  ·  ·  Combined electrothermal and electromagnetic mechanisms
 H01H 71/42
·  ·  ·  Induction-motor, induced-current, or electrodynamic release mechanisms
 H01H 71/43
·  ·  ·  ·  Electrodynamic release mechanisms
 H01H 71/44
·  ·  ·  having means for introducing a predetermined time delay (by short-circuited winding H01H 71/30; by additional armature H01H 71/34)
 H01H 71/46
·  ·  ·  having means for operating auxiliary contacts additional to the main contacts
 H01H 71/48
·  ·  ·  ·  with provision for short-circuiting the electrical input to the release mechanism after release of the switch, e.g. for protection of heating wire
 H01H 71/50
·  ·  Manual reset mechanisms
 H01H 71/52
·  ·  ·  actuated by lever
 H01H 71/54
·  ·  ·  actuated by tumbler
 H01H 71/56
·  ·  ·  actuated by rotatable knob or wheel
 H01H 71/58
·  ·  ·  actuated by push-button, pull-knob, or slide
 H01H 71/60
·  ·  ·  actuated by closure of switch casing
 H01H 71/62
·  ·  ·  with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
 H01H 71/64
·  ·  ·  ·  incorporating toggle linkage
 H01H 71/66
·  ·  Power reset mechanisms
 H01H 71/68
·  ·  ·  actuated by electromagnet
 H01H 71/70
·  ·  ·  actuated by electric motor
 H01H 71/72
·  ·  ·  actuated automatically a limited number of times
 H01H 71/74
·  Means for adjusting the conditions under which the device will function to provide protection
 H01H 73/00
Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
 H01H 73/02
·  Details
 H01H 73/04
·  ·  Contacts
 H01H 73/06
·  ·  Housings; Casings; Bases; Mountings
 H01H 73/08
·  ·  ·  Plug-in housings
 H01H 73/10
·  ·  ·  Cartridge housings, e.g. screw-in housing
 H01H 73/12
·  ·  Means for indicating condition of the switch
 H01H 73/14
·  ·  ·  Indicating lamp structurally associated with the switch
 H01H 73/16
·  ·  Distinguishing marks, e.g. colour coding
 H01H 73/18
·  ·  Means for extinguishing or suppressing arc
 H01H 73/20
·  ·  Terminals; Connections (in general H01R)
 H01H 73/22
·  having electrothermal release and no other automatic release (cartridge type H01H 73/62)
 H01H 73/24
·  ·  reset by lever
 H01H 73/26
·  ·  reset by tumbler
 H01H 73/28
·  ·  reset by rotatable knob or wheel
 H01H 73/30
·  ·  reset by push-button, pull-knob, or slide
 H01H 73/32
·  ·  reset by closure of switch casing
 H01H 73/34
·  ·  reset action requiring replacement or reconditioning of a fusible or explosive part
 H01H 73/36
·  having electromagnetic release and no other automatic release (cartridge type H01H 73/64)
 H01H 73/38
·  ·  reset by lever
 H01H 73/40
·  ·  reset by tumbler
 H01H 73/42
·  ·  reset by rotatable knob or wheel
 H01H 73/44
·  ·  reset by push-button, pull-knob, or slide
 H01H 73/46
·  ·  reset by closure of switch casing
 H01H 73/48
·  having both electrothermal and electromagnetic automatic release (cartridge type H01H 73/66)
 H01H 73/50
·  ·  reset by lever
 H01H 73/52
·  ·  reset by tumbler
 H01H 73/54
·  ·  reset by rotatable knob or wheel
 H01H 73/56
·  ·  reset by push-button, pull-knob, or slide
 H01H 73/58
·  ·  reset by closure of switch casing
 H01H 73/60
·  Cartridge type, e.g. screw-in cartridge
 H01H 73/62
·  ·  having only electrothermal release
 H01H 73/64
·  ·  having only electromagnetic release
 H01H 73/66
·  ·  having combined electrothermal and electromagnetic release
 H01H 75/00
Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of power reset mechanism
 H01H 75/02
·  Details
 H01H 75/04
·  ·  Reset mechanisms for automatically reclosing a limited number of times (circuit arrangements H02H 3/06)
 H01H 75/06
·  ·  ·  effecting one reclosing action only
 H01H 75/08
·  having only electrothermal release
 H01H 75/10
·  having only electromagnetic release
 H01H 75/12
·  having combined electrothermal and electromagnetic release
 H01H 77/00
Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting (H01H 73/00, H01H 75/00 take precedence)
 H01H 77/02
·  in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
 H01H 77/04
·  ·  with electrothermal opening
 H01H 77/06
·  ·  with electromagnetic opening
 H01H 77/08
·  ·  ·  retained closed by permanent or remanent magnetism and opened by demagnetising current
 H01H 77/10
·  ·  with electrodynamic opening
 H01H 79/00
Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected
 H01H 81/00
Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
 H01H 81/02
·  electrothermally-operated
 H01H 81/04
·  electromagnetically-operated
 H01H 83/00
Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
 H01H 83/02
·  operated by earth fault currents (by unbalance of two or more currents H01H 83/14)
 H01H 83/04
·  ·  with testing means for indicating the ability of the switch or relay to function properly
 H01H 83/06
·  operated by current falling below a predetermined value
 H01H 83/08
·  operated by reversal of direct current
 H01H 83/10
·  operated by excess voltage, e.g. for lightning protection
 H01H 83/12
·  operated by voltage falling below a predetermined value, e.g. for no-volt protection
 H01H 83/14
·  operated by unbalance of two or more currents or voltages, e.g. for differential protection
 H01H 83/16
·  operated by abnormal ratio of voltage and current, e.g. distance relay
 H01H 83/18
·  operated by abnormal product of, or abnormal phase angle between, voltage and current, e.g. directional relay
 H01H 83/20
·  operated by excess current as well as by some other abnormal electrical condition
 H01H 83/22
·  ·  the other condition being unbalance of two or more currents or voltages
 H01H 85/00
Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive (switches actuated by melting of fusible material H01H 37/76; automatic release of protective switches due to fusion of a mass H01H 73/00-H01H 83/00)
 H01H 85/02
·  Details (electrical connections in general H01R)
 H01H 85/04
·  ·  Fuses, i.e. expandable parts of the protective device
 H01H 85/06
·  ·  ·  characterised by the fusible material
 H01H 85/08
·  ·  ·  characterised by the shape of the fusible member
 H01H 85/10
·  ·  ·  ·  with constriction for localised fusing
 H01H 85/12
·  ·  ·  having two or more separate fusible members in parallel
 H01H 85/14
·  ·  ·  Insulating member carrying the fusible member and necessitating replacement therewith after blowing of fuse, e.g. cartridge
 H01H 85/16
·  ·  ·  ·  Contacts on the insulating member, e.g. cap; Fastening of fusible member to these contacts
 H01H 85/18
·  ·  ·  ·  Cartridge fillings, e.g. powder
 H01H 85/20
·  ·  Bases (holders for connectors in general H01R)
 H01H 85/22
·  ·  Intermediate or auxiliary parts for carrying, holding, or retaining fuse, co-operating with base or fixed holder, and removable therefrom for renewing the fuse
 H01H 85/24
·  ·  Means for preventing insertion of incorrect fuse
 H01H 85/26
·  ·  Magazine arrangements
 H01H 85/28
·  ·  ·  effecting automatic replacement
 H01H 85/30
·  ·  Means for indicating condition of fuse
 H01H 85/32
·  ·  ·  Indicating lamp structurally associated with the protective device
 H01H 85/34
·  ·  Distinguishing marks, e.g. colour coding
 H01H 85/36
·  ·  Means for applying mechanical tension to fusible member
 H01H 85/38
·  ·  Means for extinguishing or suppressing arc (by powder filling H01H 85/18; by mechanical tension applied to fusible member H01H 85/36)
 H01H 85/40
·  ·  ·  using an arc-extinguishing liquid (characterised by the composition of the liquid H01H 33/22)
 H01H 85/42
·  ·  ·  using an arc-extinguishing gas (characterised by the composition of the gas H01H 33/22)
 H01H 85/44
·  ·  Structural association with spark-gap arrester
 H01H 85/46
·  ·  Circuit arrangements not adapted to a particular application of the protective device
 H01H 85/48
·  Protective devices wherein the fuse is carried or held directly by the base
 H01H 85/50
·  ·  the fuse having contacts at opposite ends for co-operation with the base
 H01H 85/52
·  ·  the fuse being adapted for screwing into the base
 H01H 85/54
·  Protecting devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base
 H01H 85/56
·  ·  the intermediate or auxiliary part having side contacts for plugging into the base, e.g. bridge-carrier type
 H01H 85/58
·  ·  ·  with intermediate auxiliary part and base shaped to interfit and thereby enclose the fuse
 H01H 85/60
·  ·  the intermediate or auxiliary part having contacts at opposite ends for co-operation with the base
 H01H 85/62
·  ·  the intermediate or auxiliary part being adapted for screwing into the base
 H01H 87/00
Protective devices in which a current flowing through a liquid is interrupted by evaporation of the liquid when the current becomes excessive