Importance

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Abstract

A power failure transfer switching system to be used with a utility 240 VAC power source connected to a load circuit. The switching system includes an emergency generator, time delay relays, coil contactors, and circuitry necessary for supplying electric power to the load circuit during power outages. During normal operations wherein normal utility power is available, the load circuit derives its power from the utility power source. In the event of a power outage, the load circuit is disconnected from the utility power source via a pair of contacts. The switching system further includes a battery operated control circuit which has a time delay relay adapted to delay the activation of the generator in case the power outage is a momentary glitch. Once the generator activates, another time delay relay connected to the generator terminals delays the electrical connection between the generator and the load circuit until the generator reaches a steady-state condition. When the utility power is reestablished, another time delay relay connected to the terminals of the utility power source delays deactivation of the generator and delays reconnection between the utility power source to the load circuit in case the power restoration is only temporary.

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First Claim