G - Physics
01
R
324/59
G01R 19/15 (2006.01) G01R 19/00 (2006.01) H05B 1/02 (2006.01)
Patent
CA 1205525
ABSTRACT A device for incorporation into the power supply circuit of an electrical apparatus comprising (a) a switch which is movable from one condition to another on application of power to switch moving means therein and being held in said condition as long as power is applied to the switch moving means; (b) a signal emitter adapted to emit a power signal of short duration and being connected to the switch moving means so that on emission of the said power signal the switch will be moved to said other condition for the duration of the power signal; and (c) current detector means capable of detecting when a current flows in a line and being connected to the switch moving means to supply power thereto when current flows in the line. The current detector may be a light emitting diode (L.E.D.) and a light detector arranged to transmit current to the relay switch coil which is electrically connected to the said line by a current transformer.
369231
Hirons & Rogers
Taggart Russell H.
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