Instantaneous trip device of a circuit breaker
AssigneeMerlin Gerin
InventorsRobert Morel, Marc Rival, Hubert Garcia
Life of this patent
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Abstract
A limiting circuit breaker with a molded case comprises an overpressure actuator which, when an overpressure occurs in the arc extinguishing chamber due to the action of an arc drawn by the electrodynamic repulsion of the contacts, brings about actuation by a piston, subjected to this overpressure, of the circuit breaker trip bar. The overpressure actuator forms an almost leaktight assembly.
Claims7
An electrical circuit breaker comprising a molded case, having an arc extinguishing chamber, a pair of contacts housed in said arc extinguishing chamber, elastic means urging the contacts to the closed position, said contacts being capable of separating due to the action of electrodynamic repulsion forces when the current flowing through the contacts exceeds a preset threshold to generate limitation of said current, an opening and closing operating mechanism of said contacts, an overload and/or short-circuit fault trip device which actuates said operating mechanism, and an actuating device formed by a leaktight assembly having a duct communicating with said arc extinguishing chamber and a part reacting to the pressure transmitted by said duct and actuating said operating mechanism when said pressure exceeds a preset threshold.
Dependencies are inferred from the claim text.