Timing circuit for electronic undervoltage detecting device...

Details Timing circuit for electronic undervoltage detecting device... Timing circuit for electronic undervoltage detecting device...

H - Electricity

02

H

348/29

H02H 3/24 (2006.01)

Patent

CA 1058741

ABSTRACT OF THE DISCLOSURE A timing device utilizing a transistor and silicon controlled rectifier to provide a momentary relatively high voltage for the solenoid coil of a tripping device which is part of an undervoltage detecting and tripping circuit to thus nergize the coil to allow closing of a circuit breaker which is controlled by the undervoltage device when low voltage which originally caused the circuit breaker to trip is no longer present on the line to be protected by the circuit breaker. The relatively high voltage changes to a normal value shortly thereafter.

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