H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 3/16 (2006.01)
Patent
CA 2168709
A three wire power supply circuit is provided for selectively connecting and disconnecting a load from an alternating current power source having neutral, line and ground conductors, the load being connected to the neutral conductor, which comprises a relay connected at one terminal to the load and at another terminal to the line conductor, a control circuit connected to the relay and operable to open and close the relay, a first rectifier circuit connected in parallel with the relay and operable to supply as much as full line power to the control circuit when the relay is open, and a second rectifier circuit connected at one terminal to the line conductor and connected at another terminal to the ground conductor, the second rectifier circuit being operable to supply power to the control circuit. An air gap switching mechanism is connected to the relay and the control circuit and operable to open the relay when the air gap switching mechanism is activated.
Batko Thomas James
Eckel David Philip
Finlayson & Singlehurst
Hubbell Incorporated
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