Patent ID: RE43177

Claim:
A transfer switch comprising: a first input to couple a first multiphase low voltage electrical supply to the transfer switch; a first set of switches in electrical communication with the first input; a second input to couple a second multiphase low voltage electrical supply to the transfer switch; a second set of switches in electrical communication with the second input; an output to couple the transfer switch to a load; a third set of switches coupled in series between the second set of switches and the output; and a control module to monitor and control operation of the first set of switches, the second set of switches and the third set of switches to selectively couple the first input and the second input to the output and to detect a malfunction of any switches included in at least one of the first set of switches, the second set of switches and the third set of switches and to prevent the first input from being placed in electrical communication with the second input, wherein the second set of switches are coupled in series between the first set of switches and the third set of switches.