Functional Devices-RIB TR20VA007 Transformer

The Functional Devices RIB TR20VA007 is a heavy-duty 20VA control transformer engineered for reliable performance in demanding building automation and industrial HVACR environments. Designed to handle a 277Vac primary voltage input, this step-down transformer provides a stable 24Vac secondary voltage output, making it an essential component for powering 24V control circuits, sensors, and relays. Built with professional-grade split-bobbin construction, it ensures superior isolation and thermal stability across an operating temperature range of -30°F to 140°F. This model is exceptionally versatile for field installations, featuring both foot and single threaded hub mount options to facilitate secure attachment to junction boxes or control panels via standard 1/2-inch knockouts.

Safety and compliance are prioritized with inherently limited overcurrent protection, reducing the risk of circuit failure without the need for external fusing in many applications. The unit includes 8-inch color-coded pigtail wire leads for fast, secure terminations. Whether you are integrating it into a lighting control system or a localized HVAC controller, the TR20VA007 delivers the consistent power regulation that veteran contractors expect from the RIB series. This UL Listed Class 2 transformer is a go-to solution for technicians requiring a compact, high-quality power source for 277V electrical systems.

• Dual Mounting Flexibility: Includes both foot mounting and a single threaded 1/2" hub for diverse installation requirements.
• Inherent Protection: Features inherently limited internal protection, safeguarding the secondary circuit from overcurrent conditions.
• Extreme Durability: Rated for ambient temperatures from -30°F up to 140°F, ensuring reliable operation in unconditioned mechanical spaces.
• High-Voltage Compatibility: Specifically designed for 277V to 24V voltage reduction in commercial electrical infrastructures.
• Compact Engineering: Efficient 20VA rating provides sufficient power for distributed I/O and magnetic switches while maintaining a small footprint.

Can the TR20VA007 be mounted inside a plenum-rated space?
Yes, when installed correctly within a suitable enclosure or junction box using the provided threaded hub, this transformer is appropriate for use in various commercial environments.

What is the purpose of the split-bobbin construction?
This design physically separates the primary and secondary windings, which provides higher insulation resistance and reduces the risk of electrical breakdown between the 277V and 24V sides.

Is an external circuit breaker required for this 20VA transformer?
Because this unit features inherently limited overcurrent protection, it is designed to limit current naturally under fault conditions, though you should always verify specific local code requirements for your installation.

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.