White-Rodgers 90-T40M1 Transformer

The White-Rodgers 90-T40M1 is a heavy-duty 120V to 24V step-down transformer engineered for reliable power distribution in industrial and HVAC control systems. Delivering a consistent 40VA power rating, this Class 2 transformer is a versatile solution for technicians requiring a robust replacement for the White-Rodgers 90-4011M or similar 40VA units. Its energy-limiting design is intrinsically safe, engineered to protect downstream 24V components from damage during momentary short circuits or overload conditions.

Built with a universal multi-mount configuration, this unit includes a mounting plate and color-coded lead wires to streamline field installation in tight electrical cabinets or furnace vestibules. The 90-T40M1 transformer is rated for 50/60 Hz operation and can withstand ambient temperatures up to 150°F, making it suitable for high-demand mechanical rooms. When replacing an existing 24V control transformer, contractors prioritize this model for its 1.67A secondary output and closed-construction durability, ensuring stable 24VAC power to thermostats, contactors, and integrated ignition modules.

• Universal Compatibility: The multi-mount plate allows for junction box, panel, or foot-style mounting, making it a "truck stock" essential for various service calls.
• Enhanced Safety: Built as a Class II energy-limiting device, it prevents fire hazards by opening the primary winding if a secondary short circuit is sustained.
• Simplified Wiring: Features factory-installed, color-coded primary and secondary leads for rapid identification and secure connection.
• High Temperature Tolerance: Maintains performance in demanding environments with a maximum 150°F ambient rating.

Can I use the 90-T40M1 to replace a 30VA transformer?
Yes. As long as the primary voltage (120V) and secondary voltage (24V) match, you can use a higher VA rating (40VA) to provide more "headroom" for your control circuit. Ensure the total load does not exceed 1.67 Amps.

Does this unit support 208V or 240V primary inputs?
No. This specific model is designed for a 120V primary input. For multi-voltage applications (120/208/240V), technicians should look for the White-Rodgers 90-T40M3.

How do I identify the common lead on the secondary side?
Always refer to the wiring diagram on the housing. Typically, White-Rodgers uses color-coded leads where the black lead is common relative to the transformer winding for the primary side, while secondary leads are pre-stripped for terminal board or nut connection.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.