Patent ID: 6819014
Filing Date: 2004-11-16
Classification: H01F,H01H,Y02B,Y04S

Abstract:
An electrical power switch including a first terminal, a second terminal, a switching device connecting said first and said second terminals, switching control means for operating and controlling said switching device, and power supply circuitry connected to said first and said second terminals for supplying power to said switching control means, said power supply circuitry includes a voltage transforming means and a current transforming means, said voltage transforming means includes an input circuit of high impedance connected in a circuit branch which is generally parallel to the branch containing said switching device, said current transforming means includes an input circuit of low impedance which is serially connected with said switching device between said first and second terminals, wherein said switching device includes a solenoid operated contact switching member, said contact switching member being movable between a circuit-closing position (the â€œONâ€  position) and a circuit-opening position (the â€œOFFâ€  position), said contact switching member remains in either said circuit-closing or said circuit-opening positions unless and until a switching current is sent through said solenoid to switch said contact switching member from said circuit-closing position (â€œONâ€  position) to said circuit-opening (â€œOFFâ€ ) position or from said circuit-opening (â€œOFFâ€ ) position to said circuit-closing (â€œONâ€ ) position.