An uninterruptible power supply, UPS, system comprising: a first input configured to receive first input power from a first power source; a second input configured to receive second input power from a second power source; an output configured to provide output power to a load; a power module having an input coupled to the first input of the UPS system and an output coupled to the output of the UPS system, wherein the power module is configured to condition power provided to the input of the power module and provide conditioned power to the output of the power module; and a static bypass switch module having: - a backfeed protection circuit ; - a first switch circuit selectively coupled between an output of the backfeed protection circuit and the output of the UPS system; - a second switch circuit selectively coupled between the first input and the output of the backfeed protection circuit ; - an input of the backfeed protection circuit being coupled to the second input and the output of the backfeed protection circuit being coupled to the input of the first switch circuit ; wherein, in a first mode of operation, the second switch circuit is configured to couple the second input to the input of the power module , and provide the second input power to the input of the power module, and wherein, in a second mode of operation, the second switch circuit and the first switch circuit are configured to couple the first input to the output of the UPS system to provide the first input power to the output of the UPS system, through the static bypass switch module , bypassing the power module . a first input configured to receive first input power from a first power source; a second input configured to receive second input power from a second power source; an output configured to provide output power to a load; a power module having an input coupled to the first input of the UPS system and an output coupled to the output of the UPS system, wherein the power module is configured to condition power provided to the input of the power module and provide conditioned power to the output of the power module; and a static bypass switch module having: - a backfeed protection circuit ; - a first switch circuit selectively coupled between an output of the backfeed protection circuit and the output of the UPS system; - a second switch circuit selectively coupled between the first input and the output of the backfeed protection circuit ; - an input of the backfeed protection circuit being coupled to the second input and the output of the backfeed protection circuit being coupled to the input of the first switch circuit ; - a backfeed protection circuit ; - a first switch circuit selectively coupled between an output of the backfeed protection circuit and the output of the UPS system; - a second switch circuit selectively coupled between the first input and the output of the backfeed protection circuit ; - an input of the backfeed protection circuit being coupled to the second input and the output of the backfeed protection circuit being coupled to the input of the first switch circuit ; wherein, in a first mode of operation, the second switch circuit is configured to couple the second input to the input of the power module , and provide the second input power to the input of the power module, and wherein, in a second mode of operation, the second switch circuit and the first switch circuit are configured to couple the first input to the output of the UPS system to provide the first input power to the output of the UPS system, through the static bypass switch module , bypassing the power module . <EOS>