The WHITE-RODGERS S84-11 transformer steps 120V AC down to 25V AC to provide low-voltage control power for thermostats, relays, gas valves, and HVAC control circuits in residential and commercial HVAC systems. Built for panel or equipment mounting and continuous-duty operation, it supports furnace, air handler, refrigeration equipment, and HVAC control panels, offering a 25V AC secondary and a secondary designation of 3A356. Common replacements include Honeywell AT140A, Packard PF42440, and Mars 50354 transformers.
