Undervoltage protector for manual motor controller

Details Undervoltage protector for manual motor controller Undervoltage protector for manual motor controller

1979-06-26

1981-06-16

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335155, H01H 7306

Patent

active

042740681

ABSTRACT:
A manual motor starter having a current responsive automatic trip means is provided with an undervoltage trip device. The latter includes a solenoid having a plunger biased to operate a lever into tripping engagement with the automatic trip means when the solenoid plunger is magnetically released. While the biasing means is strong enough so that the kinetic energy of the plunger when released from its magnetically held-in position is sufficient to trip the starter, the biasing means is not strong enough to prevent resetting of the trip means after restoration of operating voltage.

REFERENCES:
patent: 4075584 (1978-02-01), Castonguay et al.
patent: 4166260 (1979-08-01), Gillette

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