H - Electricity – 01 – H
Patent
H - Electricity
01
H
H01H 73/02 (2006.01) H02H 1/06 (2006.01) H02H 7/08 (2006.01)
Patent
CA 2189685
An electronic overload relay has an intrinsic power supply connected in parallel with the NC contact of the relay between wire attachment terminals. Thepower supply is a parallel connected zener diode and capacitor, connected to theprocessor in parallel with a low voltage sensing circuit that detects the charge on the capacitor, whereby the processor operates to-turn on a unijunction transistor for low voltage coil applications to shunt the power supply during contactor closing and turn off a predetermined interval later by which time the contactor should have closed.
Borden Ladner Gervais Llp
Corporation Eaton
LandOfFree
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