Packard PM43440 Transformer

The Packard PM43440 is a versatile 40VA Class II control transformer engineered for reliable performance in demanding HVACR applications. Designed for maximum field flexibility, this multi-tap transformer features primary voltage inputs of 120V, 208V, and 240V, making it a "truck stock" essential for residential and commercial service calls. The secondary side provides multiple output options at 24V, 12V, and 2.5V via standard wire leads, allowing for precise control circuit integration. This HVAC voltage step-down transformer is a direct drop-in replacement for common industry models, including the Robertshaw 620-402 and Supco SXT111. Its multi-mount design includes a 4-1/4 inch x 4-1/4 inch mounting plate and a 1/2 inch conduit hub for simple electrical knockout installation. With a built-in fuse for overcurrent protection, the PM43440 ensures the safety and longevity of 24VAC thermostats and control boards. This unit effectively replaces any model with an equal or lower 40VA rating, providing a universal solution for secondary power requirements.

• Universal Compatibility: Multi-tap primary (120/208/240V) covers most standard HVAC power supplies.
• Efficient Installation: Multi-mount plate and conduit hub streamline setup in diverse equipment cabinets.
• Enhanced Protection: Integrated internal fuse protects downstream control components from electrical faults.
• Flexible Secondary Outputs: Triple-tap secondary (24/12/2.5V) accommodates specialized low-voltage requirements.
• Direct Cross-Reference: Replaces UEI UET111 and Global GT5032M without modification.

Can I use this transformer to replace a 30VA or 20VA unit?
Yes, the Packard PM43440 can safely replace any transformer with a VA rating of 40 or lower, provided the primary and secondary voltages match your system requirements.

What is the purpose of the 1/2 inch conduit hub?
The hub allows for secure mounting directly to an electrical knockout, ensuring a stable connection and protecting the wire leads from damage at the entry point.

How do I handle the unused primary taps?
Unused primary wires should be safely capped with wire nuts or heat-shrink tubing to prevent accidental shorting or contact with the equipment chassis.

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.