Functional Devices-RIB TR175VA001 Transformer

The Functional Devices RIB TR175VA001 Transformer is a heavy-duty solution for contractors requiring reliable 24Vac control power in commercial and industrial HVACR environments. This 175VA control transformer features a multi-tap primary, allowing for 208Vac or 240Vac primary voltage input, making it highly versatile for various field service applications. Designed with split-bobbin construction, it ensures superior isolation between the primary and secondary windings to maintain system integrity during continuous operation. The foot mount transformer design includes dual bottom openings and 9.5-inch color-coded wire leads, facilitating clean and efficient wiring within control panels or junction boxes.

This unit is specifically engineered for high-demand loads such as powering large banks of magnetic switches, driving multiple relays, or supporting complex building automation sensors that exceed the capacity of standard 40VA or 75VA units. As a 1-phase step-down transformer with no internal over-current protection, it provides a raw, high-capacity 24Vac output that allows technicians to implement their own custom fused protection downstream. Its robust gray finish and compact dimensions (approximately 3.2" x 3.8" x 3.8") allow it to fit securely in standard enclosures while operating reliably in temperatures ranging from -30°F to 140°F.

• High Power Capacity: The 175VA rating allows for the simultaneous operation of multiple 24V components without voltage drop.
• Flexible Input: Compatible with both 208V and 240V lines, reducing the need to carry multiple base models on the truck.
• Simplified Wiring: Features 9.5-inch pre-stripped leads and dual bottom search openings for versatile conduit attachment.
• Industrial Durability: Built with UL listed split-bobbin construction for high dielectric strength and long-term reliability.

What is the primary difference between the 208V and 240V wiring on this unit?
The Functional Devices TR175VA001 uses color-coded leads to designate voltage: the Black wire is Common, the Red wire is for 208Vac, and the Orange wire is for 240Vac. Ensure the unused primary lead is properly capped to avoid electrical shorts.

Does this unit include an integrated circuit breaker?
No, this specific model has no over-current protection. For installations requiring sub-circuit protection, an external fuse or breaker must be installed on the 24Vac secondary side.

Can I mount this transformer in a plenum space?
Yes, if installed within a NEMA-rated enclosure and using the appropriate conduit knockouts, this transformer series is suitable for most HVACR control applications, though you should always verify local code requirements for specific plenum installations.

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.