White-Rodgers S84Z-401 E10 Transformer

The White-Rodgers S84Z-401 E10 Transformer is a 40 VA Class 2 HVAC power transformer that steps line voltage down to 24/25 VAC for thermostats, relays, gas valves, and control circuits. It accepts 120/208/240 VAC input at 60 Hz and provides a 24/25 VAC secondary, suitable for continuous-duty operation in residential and commercial HVAC systems. The unit is designed for foot or multi-mount installation, with primary connections as lead wires and secondary connections available as lead wires or screw terminals, and it tolerates up to 150°F ambient. Commonly used in furnaces, air handlers, refrigeration, rooftop HVAC units, and industrial control panels, it serves as a reliable low-voltage power source and is a documented replacement for Honeywell AT140A1000, White-Rodgers 90-T40F3, and Mars 50354 Class 2 transformers.