Functional Devices RIB2402SB-NC Relay

The Functional Devices RIB2402SB-NC is a robust 20 Amp pilot control relay engineered for heavy-duty HVACR applications where manual override and clear status indication are non-negotiable. This SPDT enclosed relay features a 24Vac/dc coil, making it highly versatile for interfacing with building automation systems or thermostat controllers. The integrated hand-off-auto override switch allows technicians to manually bypass control logic during system testing or emergency maintenance without disconnecting field wiring. With its NEMA 1 rated housing and polarized LED indicator for coil status, this unit ensures reliable switching for inductive loads, lighting circuits, or fractional horsepower motors operating on 208V to 277V systems.

• Universal Coil Input: Operates on 24Vac/dc, providing flexibility across various low voltage control circuits.
• High Contact Rating: Rated for up to 20 Amps, suitable for inductive and resistive loads.
• Integrated Override Switch: Includes a physical Hand-Off-Auto (HOA) switch for immediate manual control.
• Contractor-Friendly Installation: Pre-wired with 12-inch leads and 1/2" NPT nipple for easy mounting to electrical junction boxes.
• Durable Construction: UL listed and housed in a rugged enclosure for long-term commercial performance.

Can this relay be used to control high-voltage blowers?
Yes, the Functional Devices RIB2402SB-NC is rated for 208V to 277V, making it ideal for controlling industrial fans, blowers, and HVAC motor starters within its amperage rating.

How does the HOA switch assist in troubleshooting?
The Hand-Off-Auto switch allows a technician to force the load "On" (Hand) or "Off" regardless of the controller signal, which is critical for verifying field wiring or mechanical equipment operation during commissioning.

Is the coil input polarity sensitive?
When using DC voltage, it is important to observe polarity for the LED indicator to function correctly, though the relay remains a reliable interface relay for standard AC control signals.

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.