Transformers; power supplies; power supply systems comprised mainly of transformers, * or * electrical chokes, [ or electronic power supplies in combination with manual, magnetic and solid-starters and controllers, thermal, magnetic and solid-state overload relays, push button stations, comprised of selector switches and pilot lights, control circuit switches and relays, float, flow, pressure, and vacuum-operated switches, resistors and rheostats, proximity switches, time-delay relays and swi...