Functional Devices Relay Control Module

Functional Devices Relay Control Modules: RIB® Engineering You Can Count On

Functional Devices has been a trusted name in control electronics since 1969, and nowhere is that expertise more apparent than in their line of relay control modules. Built around the company's iconic RIB® (Relay in a Box®) platform, these modules represent decades of engineering refinement aimed at one goal: making relay-based switching simpler, more reliable, and faster to install.

What Sets Functional Devices Apart in Relay Control Modules

The defining advantage of a Functional Devices relay control module is the integrated, ready-to-deploy design. The RIB® Relay in a Box series comes mounted and pre-wired in a housing, eliminating the time, trouble, and expense of buying separate components — such as the relay, socket, mounting rail, and enclosure — and assembling them on-site or at the shop. For technicians working against tight schedules in HVAC, building automation, or lighting control environments, this all-in-one approach is a genuine differentiator.

Functional Devices has been designing and manufacturing high-quality electronic devices in the U.S. since 1969, and their products — including the RIB® relay lineup — are rigorously tested for unmatched reliability, with fewer than 1 in 16,000 failing in the field. They back this with an industry-leading 10-year warranty, providing confidence and peace of mind in every box.

RIB® Relay Control Module Series Overview

Functional Devices offers several distinct relay control module families to match a wide range of load and installation requirements:

• RIB® Pilot Series (e.g., RIBU1C, RIBU2C, RIB2401D): These 10A relay modules are used to control light electrical loads, drive power relays or contactors, or sense the voltage being fed to electrical loads.
• RIB® Power Series (e.g., RIB2401B, RIB2421B): The Power Series features relay contacts rated for 20 and 30A, and is used for direct switching and control of heavy electrical circuits — including large resistive, motor, and lighting loads.
• RIBM® Modular Panel Series: The RIBM Series Modular Panel Relays allow installers to mount a combination of relays in an attractive metal enclosure, with modules that snap into a 4-inch plastic track — providing a convenient, cost-saving method of mixing and matching relays of different ratings to suit the application.
• RIB-FA Fire Alarm Series: These polarized relay control modules are purpose-built to work in supervised fire alarm and smoke control systems, with 12 or 24 VAC/VDC coil voltage options and SPDT or SPST relay contacts.

Wide Voltage Compatibility and Easy Installation

A hallmark of the Functional Devices relay control module lineup is broad coil voltage compatibility. Models like the RIBU1C accept 10–30 VAC/DC or 120 VAC, while others such as the RIB2421B extend support to 208–277 VAC — making it straightforward to find the right module for virtually any building control circuit. The RIB Pilot Series features a protruding ½-inch or ¾-inch NPT nipple from which all wires exit; installation is as simple as removing a conduit knockout, inserting the wires and nipple, tightening the locknut, and connecting the wires.

Trusted Across HVAC and Building Automation

Functional Devices has established itself as a leader in the HVAC, Building Controls, Energy Management, Lighting Controls, and Wireless industries. Whether you're replacing a failed module in a rooftop unit, retrofitting a commercial building, or specifying controls for a new construction project, Functional Devices relay control modules are a field-proven choice backed by more than five decades of American manufacturing.

Browse the full selection of Functional Devices Relay Control Modules to find the right RIB® solution for your application, or explore the complete Functional Devices brand catalog and the broader Relay Control Module category for additional options.