Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting (
H 01 H 73/00, H 01 H 75/00 take precedence)
77
/
02
•
in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
77
/
04
•
•
with electrothermal opening
77
/
06
•
•
with electromagnetic opening
77
/
08
•
•
•
retained closed by permanent or remanent magnetism and opened by windings acting in opposition
77
/
10
•
•
with electrodynamic opening
79
/
00
Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected
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
81
/
02
•
electrothermally-operated
81
/
04
•
electromagnetically-operated
83
/
00
Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
83
/
02
•
operated by earth fault currents (H 01 H 83/14 takes precedence)
83
/
04
•
•
with testing means for indicating the ability of the switch or relay to function properly
83
/
06
•
operated by current falling below a predetermined value
83
/
08
•
operated by reversal of dc
83
/
10
•
operated by excess voltage, e.g. for lightning protection
83
/
12
•
operated by voltage falling below a predetermined value, e.g. for no-volt protection
83
/
14
•
operated by unbalance of two or more currents or voltages, e.g. for differential protection
83
/
16
•
operated by abnormal ratio of voltage and current, e.g. distance relay
83
/
18
•
operated by abnormal product of, or abnormal phase angle between, voltage and current, e.g. directional relay
83
/
20
•
operated by excess current as well as by some other abnormal electrical condition
83
/
22
•
•
the other condition being unbalance of two or more currents or voltages
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 H 01 H 37/76; automatic release of protective switches due to fusion of a mass H 01 H 73/00 to H 01 H 83/00; disposition or arrangement of fuses on boards H 02 B 1/18)
85
/
02
•
Details (electrical connections in general H 01 R)
85
/
04
•
•
Fuses, i.e. expendable parts of the protective device, e.g. cartridges
85
/
041
•
•
•
characterised by the type [5]
85
/
042
•
•
•
•
General constructions or structure of high voltage fuses, i.e. above 1,000 V [5]
85
/
044
•
•
•
•
General constructions or structure of low voltage fuses, i.e. below 1,000 V, or of fuses where the applicable voltage is not specified (H 01 H 85/046 to H 01 H 85/048 take precedence) [5]
Bases for supporting the fuse; Separate parts thereof (bases, casings for connectors, in general H 01 R)
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
85
/
24
•
•
Means for preventing insertion of incorrect fuse
85
/
25
•
•
Safety arrangements preventing or inhibiting contact with live parts, including operation of isolation on removal of cover (interlocking between casing or protective shutter of a switch and mechanism for operating its contacts H 01 H 9/22) [5]
85
/
26
•
•
Magazine arrangements
85
/
28
•
•
•
effecting automatic replacement
85
/
30
•
•
Means for indicating condition of fuse structurally associated with the fuse
85
/
32
•
•
•
Indicating lamp structurally associated with the protective device
85
/
34
•
•
Distinguishing marks, e.g. colour coding
85
/
36
•
•
Means for applying mechanical tension to fusible member
85
/
38
•
•
Means for extinguishing or suppressing arc (by powder filling H 01 H 85/18; by mechanical tension applied to fusible member H 01 H 85/36)
85
/
40
•
•
•
using an arc-extinguishing liquid (characterised by the composition of the liquid H 01 H 33/22)
85
/
42
•
•
•
using an arc-extinguishing gas (characterised by the composition of the gas H 01 H 33/22)
85
/
43
•
•
Means for exhausting or absorbing gases liberated by fusing arc, or for ventilating excess pressure generated by heating [5]
85
/
44
•
•
Structural association with spark-gap arrester
85
/
46
•
•
Circuit arrangements not adapted to a particular application of the protective device
85
/
47
•
•
Means for cooling [5]
85
/
48
•
Protective devices wherein the fuse is carried or held directly by the base
85
/
50
•
•
the fuse having contacts at opposite ends for co-operation with the base
85
/
52
•
•
the fuse being adapted for screwing into the base
85
/
54
•
Protective devices wherein the fuse is carried, held, or retained by an intermediate or auxiliary part removable from the base, or used as sectionalisers
85
/
56
•
•
the intermediate or auxiliary part having side contacts for plugging into the base, e.g. bridge-carrier type
85
/
58
•
•
•
with intermediate auxiliary part and base shaped to interfit and thereby enclose the fuse
85
/
60
•
•
the intermediate or auxiliary part having contacts at opposite ends for co-operation with the base
85
/
62
•
•
the intermediate or auxiliary part being adapted for screwing into the base
87
/
00
Protective devices in which a current flowing through a liquid or solid is interrupted by the evaporation of the liquid or by the melting and evaporation of the solid when the current becomes excessive, the circuit continuity being reestablished on cooling [3]
