Undervoltage release device for a circuit breaker

Details Undervoltage release device for a circuit breaker Undervoltage release device for a circuit breaker

1980-09-29

1983-01-25

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

200153SC, H01H 7300, H01H 8300

Patent

active

043706355

ABSTRACT:
A direct acting undervoltage release device utilizes stored spring energy to trip a circuit breaker when the control voltage reduces to a critical level (the "undervoltage"). The device includes a solenoid that senses the undervoltage, and a charging motor that automatically resets the device after a tripping operation (provided the control voltage recovers to its normal level). The direct acting feature is achieved by providing a chargable trip spring and a trip pin in the circuit breaker which directly drives the latch bar of the breaker to trip the breaker.

REFERENCES:
patent: 3919674 (1975-11-01), Acampora et al.
patent: 4020432 (1977-04-01), Erickson et al.
patent: 4110582 (1978-08-01), Barkan
patent: 4180788 (1979-12-01), Barkan
patent: 4301434 (1981-11-01), Castonquay

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