Undervoltage release device for circuit breakers

Details Undervoltage release device for circuit breakers Undervoltage release device for circuit breakers

1976-10-06

1978-02-21

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

361 92, H01H 8300

Patent

active

040755843

ABSTRACT:
In a circuit breaker undervoltage release device, a spring powered trip slide is held in a latched position by a latch lever while the plunger of a solenoid is magnetically held in a seated position against the bias of a calibrated return spring. In the event of an undervoltage condition, the spring retracts the plunger, causing the latch lever to release the trip slide, which then moves to trip the breaker. Opening movement of the breaker mechanism first actuates a reset lever to load a reset spring and then returns the slide to its latched position. As the latch lever regains latching control of the slide, the reset spring discharges to snap the plunger to its seated position.

REFERENCES:
patent: 3723924 (1973-03-01), Shaffer et al.
patent: 3806846 (1974-04-01), Powell
patent: 4016518 (1977-04-01), Lang et al.

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