Patent ID: 6011327
Filing Date: 2000-01-04
Classification: H02J

Abstract:
An AC transfer switch, comprising:a first AC input from a first AC power line cord;a second AC input from a second AC power line cord;a switch for switching an output between the first and second AC power line cord, wherein the switch further comprises a first contactor set for selecting the first AC line cord in response to a first contact signal and a second contactor set for selecting the second AC line cord in response to a second contact signal, each of the first and second contactor sets including two contactors in series;a control circuit for generating a control signal to control the selection between the first and second AC power line cords by toggling between a first and second output port; anda first contactor set auxiliary contact in series with the first contactor set for receiving the control signal when the control signal is at the first output port and a second contactor set auxiliary contact in series with the second contactor set for receiving the control signal when the control signal is at the second output port, the first contactor set auxiliary contact being logically disposed to ensuring that the second contactor set does not receive the second contact signal when the first contactor set is closed and the second contactor set auxiliary contact being logically disposed to ensuring that the first contactor set does not receive the first contact signal when the second contactor set is closed.