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Power supply control apparatus with a manually operable control switch

  • US 5,498,913 A
  • Filed: 08/24/1992
  • Issued: 03/12/1996
  • Est. Priority Date: 08/27/1991
  • Status: Expired due to Fees
First Claim
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1. A power supply control apparatus comprising:

  • a first terminal connection for connection to a backup power supply,a second terminal connection for connection to a main power supply,a third terminal connection for connection to a load,a manually operable control switch means connected between the first terminal connection and the third terminal connection,switching means for connecting said first terminal connection to said third terminal connection, andmeans for controlling said switching means to;

    inhibit connection of said first terminal connection to said third terminal connection in response to operation of said manually operable control switch means in the absence of a voltage at said second terminal connection, andconnect said first terminal connection to said third terminal connection in response to the presence of a voltage at said second terminal connection, regardless of actuation of said manually operable control switch means,said means for controlling being connected to the second terminal connection, the manually operable control switch means and the switching means.

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