Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Automatic circuit-interrupting devices
Patent
1977-11-23
1980-07-01
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Automatic circuit-interrupting devices
335160, 335172, 361 96, H01H 924, H02H 308
Patent
active
042108870
ABSTRACT:
A circuit interrupter includes an interchangeable trip unit removably disposed in the circuit interrupter housing and connected between a current transformer and a trip mechanism. The trip unit contains electronic circuitry for activating the trip mechanism to open the contacts upon detection of overload current therethrough and includes rejection means provided to ensure that only a trip unit having circuitry compatible with the electrical characteristics of the circuit interrupter can be inserted into the housing. The rejection means comprise a plurality of pins mounted within the housing and extending into the recess to be occupied by the trip unit. The pins are arranged in a pattern unique to all circuit interrupters having identical electrical characteristics. A pattern of holes is provided in the enclosure of the trip unit, the hole pattern being unique to trip units having identical electrical characteristics. The pin pattern and hole pattern of compatible circuit interrupters and trip units, respectively, are identical, permitting such compatible trip units to receive all rejection pins of compatible circuit interrupters such that said compatible trip units can be completely inserted into the recess of the circuit interrupter housing. Interlock means are provided such that the circuit breaker mechanism is disposed in a trip free condition preventing closure of the contacts unless a trip unit is completely inserted into the circuit interrupter housing recess.
REFERENCES:
patent: 3761777 (1973-09-01), Willard et al.
patent: 3826951 (1974-07-01), Mater et al.
patent: 4037183 (1977-07-01), Gaskill
Hill Robert H.
Maier Alfred E.
Matsko Joseph J.
Skalka Paul
Broome Harold
Converse, Jr. Robert E.
Westinghouse Electric Corp.
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