Patent attributes
A transfer switch includes first terminals adapted to input power from a first power source, second terminals adapted to input power from a second power source, third terminals adapted to output power to a first load, and a transfer mechanism adapted to selectively electrically connect the one of the first or second terminals to the third terminals. A control mechanism cooperates with the first and second terminals and the transfer mechanism to electrically connect one of the first and third terminals or the second and third terminals. A control circuit and a relay include normally closed contacts and normally open contacts. The relay is de-energized responsive to the first and third terminals being electrically connected, and energized responsive to the second and third terminals being electrically connected. The normally closed contacts shed corresponding second loads and the normally open contacts enable corresponding third loads when the relay is energized.
