Circuit interrupter with interlocked interchangeable trip unit

Details Circuit interrupter with interlocked interchangeable trip unit Circuit interrupter with interlocked interchangeable trip unit

H - Electricity

01

H

306/277

H01H 71/12 (2006.01) H01H 71/74 (2006.01)

Patent

CA 1111886

CIRCUIT INTERRUPTER WITH INTERLOCKED INTERCHANGEABLE TRIP UNIT ABSTRACT OF THE DISCLOSURE 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 re- jection means provided to ensure that only a trip unit having circuitry compatible with the electrical character- istics 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 iden- tical 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 com- patible circuit interrupters and trip units, respectively, are identical, permitting such compatible trip units to receive all rejection pins of compatible circuit inter- rupters such that said compatible trip units can be com- pletely 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. -1-

313674

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