Current auxiliary relay for circuit breaker

Details Current auxiliary relay for circuit breaker Current auxiliary relay for circuit breaker

1975-03-21

1976-01-27

Envall, Jr., R. N.

H02H 304

Patent

active

039355152

ABSTRACT:
In a circuit breaker control installation, an electromechanical current auxiliary relay is provided having a series primary coil of relatively few turns wound over an isolated shunt secondary coil of many turns. Both coils are wound on a magnetic core which is integral with the armature of the trip-alarm relay. A diode is connected in series with the secondary coil having such polarity that collapse of current in the series primary winding energizes the shunt secondary winding in a direction to circulate current through the diode thereby holding the armature of the trip-alarm relay in closed-contacts position, thereby providing a substantially longer contact closure time delay for the alarm circuit.

REFERENCES:
patent: 2669664 (1954-02-01), Poznik
patent: 3258758 (1966-06-01), Byrd
patent: 3611043 (1971-10-01), Steen

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