Functional Devices TR40VA004 Transformer

The Functional Devices TR40VA004 is a versatile 40VA multi-tap power transformer engineered for reliable 24Vac secondary output in demanding HVACR and building automation environments. Designed for maximum flexibility, this unit handles primary voltages of 120V, 208V, 240V, and 277V, making it a standard truck-stock item for commercial and residential service calls. The TR40VA004 features inherently limited over-current protection, ensuring the safety of downstream low voltage control circuits like thermostats, relays, and actuators without requiring external fusing. For mounting, the dual-threaded hub and foot-mount design provide multiple configurations for securing to 4-inch square boxes or unit cabinets. This Class 2 transformer is built to maintain steady secondary voltage under fluctuating loads, critical for modern digital controllers and 24V peripheral devices found in modern air handling units and heat pumps.

• Multi-Tap Primary: Supports 120/208/240/277Vac inputs, reducing the need to carry multiple single-voltage units.
• 40VA Capacity: Sufficient power for small-to-midsize control loops and basic residential HVAC systems.
• Mounting Versatility: Dual hub and foot-mount options for quick installation in field junctions or equipment panels.
• Safety Protection: Inherently limited design prevents thermal overload and short-circuit damage to the core.
• Industry Standard Leads: Features color-coded 8-inch leads for rapid wiring and identification.

Common Questions

Can the TR40VA004 be used for 208V and 240V applications? Yes, the multi-tap primary winding includes dedicated leads for both 208V and 240V, along with 120V and 277V common in commercial lighting and power circuits.

What is the difference between a foot mount and a hub mount? This unit offers both; the foot mount allows it to be screwed to a flat surface, while the threaded hubs allow it to be mounted directly through a standard 1/2-inch knockout on an electrical box.

How do I handle the unused primary leads? Unused primary voltage leads must be capped with wire nuts or heat shrink to prevent short circuits against the enclosure or other live components.

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.