Trip link latch and interpole link for a circuit breaker

Details Trip link latch and interpole link for a circuit breaker Trip link latch and interpole link for a circuit breaker

1991-12-23

1993-05-25

Donovan, Lincoln

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Latching means

335 23, H01H 920

Patent

active

052144020

ABSTRACT:
Tripping of the poles of a multi-pole breaker requires less force from current sensing actuators, through use of a lost motion linkage including a trip link which unlatches the linkage holding one pole contact set closed before operating the inter-pole tripping elements. Preferably the breaker has a fast forcing arrangement for forcing a movable contact open under short-circuit conditions, faster than the normal contact opening spring can respond. The lost motion linkage is provided by a trip link which first releases a secondary latch to permit contact opening at normal speed, and then operates an inter-pole tripping element. Under short-circuit conditions the trip link engages the movable contact to force it open, between unlatching and engagement of the inter-pole tripping element.

REFERENCES:
patent: 3467920 (1969-09-01), Hall et al.
patent: 4276526 (1981-06-01), Ciarcia et al.

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