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Switching and testing system

  • US 4,841,159 A
  • Filed: 08/29/1986
  • Issued: 06/20/1989
  • Est. Priority Date: 08/29/1986
  • Status: Expired due to Term
First Claim
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1. A switching system for powering first and second electrical loads from a voltage supply, the electrical loads being operable from controls and connected to the voltage supply by the switching system, the switching system comprising:

  • electronic switch means having a control element which is responsive to a control voltage difference to cause said switch means to become conductive, said switch means having a switch terminal connected to a first supply line and another switch terminal connected to the first electrical load;

    means responsive to the controls for generating the control voltage difference when the voltage supply is connected to the first supply line thereby powering the first electrical load from the first supply line;

    means responsive to the controls for generating first and second control signals;

    a first contactor, responsive to the first control signal, for connecting the voltage supply to a first supply line , the first electrical load connected to the first supply line; and

    a second contactor, responsive to the second control signal, for connecting the second supply line to the first supply line thereby connecting the voltage supply to the second supply line, and causing said means for generating the control voltage difference to interrupt power through the electronic switch means thereby discontinuing the supply of power to the first electrical load.

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