Protector circuit for solenoid operator

Details Protector circuit for solenoid operator Protector circuit for solenoid operator

H - Electricity

02

H

348/7

H02H 7/20 (2006.01) H01H 71/14 (2006.01) H01H 89/06 (2006.01) H02H 5/04 (2006.01) H03K 17/08 (2006.01)

Patent

CA 1130435

ABSTRACT OF THE DISCLOSURE A protector means is provided to prevent thermal destruction of a solenoid adapted for very short duration energization at currents far in excess of the continuous current carrying capability of the solenoid. The protector means includes a positive temperature coefficient thermistor which controls the gate potential of an S.C.R. whose power circuit is in series with the solenoid. When thermistor temperature rises to a predetermined level the voltage applied to the gate drops below the gate threshold thereby preventing the S.C.R. from firing on the next positive half-cycle.

340654

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