Functional Devices RIB RIB2421SB Relay

The Functional Devices RIB2421SB is a heavy-duty, pre-packaged 20 Amp enclosed relay engineered for high-demand HVACR and industrial energy management systems. This SPDT relay features a multi-voltage coil that accepts 24VAC/DC, 120VAC, and 208-277VAC, providing a versatile solution for varying control circuit requirements without the need for multiple stocked parts. Designed for direct BAS and lighting control, the RIB2421SB relay includes an integrated override switch (Closed/Open/Auto) for manual testing and maintenance, ensuring field reliability during system commissioning.

Housed in a plenum-rated NEMA 1 enclosure, this unit is built for durability in commercial environments, featuring a 1/2" NPT nipple for secure mounting to standard electrical knockouts. The internal LED status indicator provides immediate visual confirmation of relay activation. With a mechanical life rating of 10 million cycles, this RIB relay handles resistive, ballast, and motor loads—rated up to 2 HP @ 277VAC—making it a staple for contractors managing complex building automation projects.

• Reduced Installation Time: Pre-wired and enclosed design eliminates the need for separate sockets, mounting rails, or housings.
• Broad Compatibility: Multi-voltage input supports 24VAC/DC, 120VAC, and 208-277VAC, making it suitable for almost any control transformer.
• Local Control: The Override Switch allows technicians to manually force the load on or off for fast troubleshooting.
• Plenum Rated: UL listed for use in air handling spaces, ensuring code compliance in ceiling installations.
• High Load Capacity: Capable of switching 20A resistive loads or 2 HP motors, covering a wide range of HVACR equipment.

Can the RIB2421SB be used for motor starting?
Yes, this 20 Amp power relay is rated for 1 HP at 120VAC and 2 HP at 277VAC, making it ideal for direct control of small motors and fans.

What does the Override Switch do?
The switch allows a technician to bypass the controller by setting the relay to "Closed" (On) or "Open" (Off). In "Auto" mode, the relay follows the signal from the 24V or line voltage coil.

Is this relay suitable for lighting circuits?
This model is frequently used for lighting control applications, rated for 20 Amp Ballast at 120/277VAC, though it is not rated for electronic ballasts.

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.