Bell alarm for circuit breaker

Details Bell alarm for circuit breaker Bell alarm for circuit breaker

1979-06-26

1981-01-20

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 8, 335 13, H01H 7312

Patent

active

042465575

ABSTRACT:
A multipole circuit breaker having a single contact operating mechanism for all poles and a fault current sensing means for automatic tripping of the breaker is provided with alarm switch means to indicate when opening of the circuit breaker has been caused by a fault condition. The operating mechanism includes a metal frame to which a latchable cradle is pivotally mounted. The frame includes parallel guide slots through which a formed pin actuator extends to be moved by the cradle as it operates between its latched and released (tripped) positions. A spring connected between the mechanism frame and the pin actuator biases the latter toward the cradle. An insulating extension element is adjustably mounted on the actuator to transmit motion of the latter to operate a switch in an alarm circuit, in accordance with cradle position.

REFERENCES:
patent: 3820046 (1974-06-01), Layton et al.
patent: 3973230 (1976-08-01), Ciarcia et al.
patent: 4019005 (1977-04-01), Michetti
patent: 4166989 (1979-09-01), Castonguay et al.

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