H - Electricity – 02 – H
Patent
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
Gould Inc.
Marks & Clerk
LandOfFree
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