Functional Devices RIB2421B Relay

The Functional Devices RIB2421B is a versatile enclosed relay designed for demanding commercial and industrial power control applications. This SPDT relay features a 20 Amp contact rating, making it a reliable choice for switching HVAC control systems, motors, and lighting loads. Built for convenience, the "Relay in a Box" design includes pre-wired 16-inch, 600V rated leads and a 1/2" NPT nipple, allowing for rapid installation into a standard conduit knockout. The unit is equipped with a multi-voltage continuous duty coil that accepts 24 VAC/DC, 120 VAC, and 208-277 VAC, providing maximum flexibility on the job site. Housed in a NEMA 1 plenum-rated enclosure, it features an integrated LED indicator to provide immediate visual confirmation of the relay status. This RIB2421B relay is UL listed for energy management and fire alarm applications, ensuring compliance in critical building automation and BAS environments.

• Universal Voltage Compatibility: Simplifies inventory by supporting 24VAC/DC, 120V, and 208-277V coil inputs.
• High-Current Capacity: 20 Amp SPDT contacts handle heavy resistive and inductive loads.
• Plenum Rated Housing: NEMA 1 enclosure is suitable for installation in air-handling spaces.
• Pre-Wired Design: Saves labor hours by eliminating the need for separate relay sockets and labor-intensive assembly.
• Mechanical Durability: Rated for a minimum of 10 million cycles under standard operating conditions.

Can the RIB2421B be used for motor loads?
Yes, the Functional Devices RIB2421B is rated for 1 HP at 120 VAC and 2 HP at 277 VAC, making it suitable for direct control of small motors and blowers.

How do I confirm the relay is active?
This model includes a built-in LED indicator that illuminates when the coil is energized, allowing for quick troubleshooting in the field.

Is this relay suitable for fire alarm circuits?
Absolutely. It carries UL864 and UL916 listings, specifically approved for use in fire and energy management systems.

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.