Ambient-compensated circuit breaker

Details Ambient-compensated circuit breaker Ambient-compensated circuit breaker

1975-10-03

1977-06-28

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

337 78, 337 79, H01H 7116

Patent

active

040328767

ABSTRACT:
An ambient-compensated, current-actuated circuit breaker, adapted to be miniaturized. In one embodiment, the device has a movable spring arm with contact portion mounted on a base; a plural-legged, current sensitive monometallic element is mounted on the base with the legs joined at an upper end and spread apart to form a rigid structure, the current-sensitive element having a combined contact and latch portion at one end which engages the spring arm in a contact-closed position, the force of the spring arm being in a direction in which the current sensitive element is rigid. Upon heating a proper one or more of the legs by electrical current, the heated leg or legs elongate and move the upper end portion and latch portion in a direction to release the spring arm and open the contacts. An equal change in temperature of all the legs will not trip the latch.

REFERENCES:
patent: 2496759 (1950-02-01), Warsher
patent: 3761855 (1973-09-01), Townsend

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