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How to Choose the Right RIB® Relay for Your HVAC System

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When it comes to reliability and simplicity, Functional Devices RIB® relays are hard to beat. Stromquist makes it easy to select the right one for your HVAC application — no guesswork required.

Why RIB® Relays?

RIB (Relay in a Box) units come pre-wired and ready to install, saving time on the job site. They’re trusted for dependable control in fans, pumps, compressors, lighting, and more.

How to Select the Right Relay

Choosing the correct RIB relay starts with three basics:

  • Control Voltage – Match your relay coil voltage to your control circuit (commonly 24 VAC, 120 VAC, or 208-277 VAC).
  • Load Type – Know if you’re switching resistive (heaters), inductive (motors, fans), or capacitive (ECMs, LED lighting) loads.
  • Mounting & Space – RIBs are available in surface, DIN-rail, or snap-track options to fit any panel layout.

Helpful Features

  • Depending on your project, consider relays with:
  • Time-delay options for short-cycle prevention
  • Indicator lights for quick troubleshooting
  • NEMA-rated enclosures for indoor/outdoor use

Popular Functional Devices RIB® Models

Application Model Highlights
Fan or blower RIBU1C Universal coil (10–30 VAC/VDC or 120 VAC), SPDT contacts
Pump control RIB2401B 20A contacts, pilot duty rated, NEMA 1 enclosure
Compressor lockout RIBU2C Two SPDT relays in one enclosure (dual control)
Lighting control (HVAC-linked) RIB2421B 20A rated, heavy-duty contacts, LED indicator
Staging / short-cycle prevention RIBTD2401B Adjustable time delay (6 sec – 20 min), SPDT

Need Help Selecting?

Stromquist’s team can help you find the right Functional Devices RIB® relay for your next job — ensuring the right fit, fast shipping, and full support.

?? Contact us to get started or request a quote today.


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