Apparatus and method for selectively delaying the connection of an electrical supply voltage to an electrical load
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United States of America Patent
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Jan 22, 1991
Grant Date -
N/A
app pub date -
Apr 12, 1989
filing date -
Apr 12, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for delaying the reconnection of an electrical supply voltage to an electrical load when the supply voltage has been restored after an interruption. In its basic form, the apparatus comprises a circuit interrupter coupled between the network and the load for disconnecting the load from the network when the supply voltage has been interrupted and a sensing circuit coupled to the circuit interrupter and to the supply network for sensing when the supply voltage has been restored and for actuating the circuit interrupter to reconnect the supply and the load at a first predetermined time delay after the supply voltage has been restored. In additional embodiments, the apparatus prevents the disconnection of the network from the load during momentary interruptions of power for less than a specified amount of time, and a power saver circuit may be employed to conserve power, especially if electromechanical relays and power contactors are employed to realize parts of the apparatus.
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