Combined trip unit and accessory module for electronic trip circ

Details Combined trip unit and accessory module for electronic trip circ Combined trip unit and accessory module for electronic trip circ

1986-07-07

1987-10-13

Shaw, Clifford C.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335179, 335236, 335183, H01M 900

Patent

active

047001615

ABSTRACT:
A combined trip actuator and accessory module for molded case circuit breakers is accessible in the field for user selected accessory options. The trip actuator includes a U-shaped stator with a permanent magnet at the end of one leg. A spring-loaded armature member extends across both legs to form a closed-loop magnetic circuit. The over-current trip coil and shunt trip coil are arranged on one leg with the undervoltage coil arranged on the other leg. The accessory module is accessible from the top surface of the breaker cover for field installation of the undervoltage and shunt trip coils to provide the corresponding undervoltage and shunt trip functions.

REFERENCES:
patent: 2151400 (1939-03-01), Williams
patent: 3264424 (1966-08-01), Baermann
patent: 4013926 (1977-03-01), Lang et al.
patent: 4213109 (1980-07-01), Marcoz
patent: 4581597 (1986-04-01), Walley
patent: 4589052 (1986-05-01), Dougherty
Henry Willard, "Combined Accessory and Trip Actuator Unit for Electronic Circuit Breakers", Ser. No. 759,979, filed Jul. 29, 1985.
Frank A. Todaro et al., "Trip Actuator for Molded Case Circuit Breakers", Ser. No. 862,929, filed May 14, 1986.
Ronald D. Ciarcia et al., "Interchangeable Mechanism for Molded Case Circuit Breaker", Ser. No. 817,213, filed Jan. 8, 1986.

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