Patent ID: 9595846
Date: 2017-03-14
CPC Classifications: H01H,H02J

Claim:
1. A system for an automatic transfer switch, the system comprising: a first power source connection electrically connected to a first power source; a second power source connection electrically connected to a second power source; a first electromagnetic latch connected between the first power source and a load; a second electromagnetic latch connected between the second power source and a load; a safety circuit in electrical communication with the first electromagnetic latch and the second electromagnetic latch, the safety circuit comprising a plurality of loop connections and a plurality of serially connected safety stage circuits each comprising at least one electromechanical relay in electrical communication with the first electromagnetic latch or the second electromagnetic latch; and a control circuit in electrical communication with the safety circuit, the control circuit configured to provide one or more control signals comprising an OPEN signal to the first electromagnetic latch, an OPEN signal to the second electromagnetic latch and a CLOSED signal to control the operation of the first electromagnetic latch and the second electromagnetic latch; wherein the safety circuit further comprises a first stage comprising a first loop connection in electrical communication between the CLOSED signal from the control circuit and the first electromagnetic latch and a second loop connection in electrical communication between the CLOSED signal from the control circuit and the second electromagnetic latch.