Medium-voltage (5 to 15 kV) circuit breaker-type automatic transfer switches and bypass/isolation switches have 20% to 50% smaller footprints than earlier versions. UL tested, listed, and labeled under UL 1008A and suitable for use in legally required alternate power systems, the switches transfer electrical loads between preferred and alternate power sources through controlled opening and closing of circuit breakers. Switches can be configured for open- or closed-transition transfer. Designed for unattended operation, they include controls for manually initiated operation. Switch functions are controlled by the company’s RPTCS programmable microprocessor-based control system and meet or exceed IEEE, NEMA, and ANSI standards.