Trip link latch and interpole link for a circuit breaker
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United States of America Patent
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-
May 25, 1993
Grant Date -
N/A
app pub date -
Dec 23, 1991
filing date -
Dec 23, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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