Circuit breaker with auxiliary tripping unit

Details Circuit breaker with auxiliary tripping unit Circuit breaker with auxiliary tripping unit

1980-07-11

1982-05-11

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 35, 337 2, H01H 8300, H01H 7348

Patent

active

043296696

ABSTRACT:
A manually operated two-pole excess-current protective circuit breaker includes a bimetal control for a switching latch serving both contact bridges. In case of an excess current, the circuit breaker is tripped by a switching latch actuated by the bimetal by virtue of its heat-caused deformation. The circuit breaker unit is provided with a plug-in auxiliary tripping unit having a solenoid-actuated plunger extending into the circuit breaker housing. The plunger moves codirectionally with the working end of the bimetal and cooperates with the switching latch of the circuit breaker. The plunger may assume an actuating position and a withdrawn position dependent upon whether the solenoid is in an energized or a de-energized state and the auxiliary tripping unit may serve as a zero-voltage tripper or as an excess-current tripper dependent upon its structural design which determines the relationship of the plunger positions to the states of solenoid energization.

REFERENCES:
patent: 4167720 (1979-09-01), Krasser
patent: 4206430 (1980-06-01), Rusch et al.

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