| 摘要 |
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.
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