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American-made Relays


RIB relaysLooking for relays? Controls Central carries a full line of reliable, American-made relays from Functional Devices, some of which are pre-packaged to save the HVAC/R professional time, trouble, and expense. Not only does Controls Central have the complete line of Functional Devices products, but also the lowest prices available on the Internet.

Since 1969, Functional Devices, Inc. has been designing and manufacturing quality electronic devices and related products for the HVAC/R, Building Controls and Energy Management, Energy Savings, Lighting Controls, and Wireless industries.

Headquartered in Russiaville, Indianapolis, Functional Devices’ goal is to offer customers high-quality, American-made products and the most reliable and economical solutions, together with world-class support from their sales and engineering experts.

Functional Devices is known for its following product lines: relays, current sensors, power control, enclosures, power supplies, transformers, and accessories. The company has established itself as a leader in the HVAC, Building Controls, Energy Management, Energy Savings, Lighting Controls, and Wireless industries.

If you need Functional Devices products or any other HVAC/R product brand, ControlsCentral.com is the largest online HVAC/R controls store in the world.  The website has more than 2.5 million HVAC/R controls parts in stock and offers products from leading manufacturers, including Emerson Motor Technologies. The site includes product specifications and product applications for all of your commercial HVAC controller needs.

Please do not hesitate to contact Controls Central if you need any additional information on Functional Devices relays and products, or any of the other brands that we carry. Controls Central offers support for the HVAC/R parts in our extensive online catalog.

Pilot Relays Series from Functional Devices

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The Pilot Series Relays are rated at 10 or 15 amps. Rather than buying separate components (relay, LED indicator, socket, mounting rail, transient protection, and housing) and assembling them on the job or at the shop, Pilot Series Relays are prepackaged to save the service professional time, trouble, and expense. A few popular Pilot Relays are RIBH1C, RIBU1C, RIBU1S, and RIB2401DView Pilot RIB Relays.

Power RIB Relay Services

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Power Series Relays, rated at 20 or 30 Amps, also come packaged to make the professional’s job easier. With these relays there is no need to buy separate components to assemble on the job. Some popular Power Series Relays on our site include RIB013Pand RIB2402B. View the complete list of Power Relays.

Latching Series

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For fast and easy installations, FDI Latching RIB comes pre-wired and pre-packaged with its own NEMA 1 plastic enclosure with a 1/2 mounting nipple, and LED indicator. Pulse commands from a controller or momentary switch closure activate these RIB relays. In the event of a temporary control panel failure, the relay contacts are mechanically latched in the closed position and the load will remain on. In the event of a complete power failure, the contacts will remain in their last state, and the load will activate upon the return of normal power or emergency power. A popular Latching Relay from this series is RIBL12B. View More Latching Relays.

Low Input/Optoisolated Series

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Optoisolated relays are the answer to greater coil drive power. Not only are the power settings adjustable on these relays, but additional power can be boosted through a separate pair of wires or from a local nearby relay.  View Optoisolated Relays.

Polarized Series

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What’s the difference between polarized RIB and non-polarized RIB?  

The Polarized RIB Series is distinguished from the standard RIB series only by its polarized coil; otherwise, they are identical. Polarized RIB Relays work in systems requiring supervision from controllers, utilizing EOLR (end-of-line resistors). These relays can optionally be used with (non-polarized) A/C voltage as well. View Polarized Relays

Dry Contact Input Series

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The Dry Contact Input RIB Series offers versatility. Not only does it have all of the advantages of the standard RIB line, but these relays can be activated by a variety of dry-contacts such as thermostats, switches, other relays, solid-state switches, etc. When the dry-contact input is closed, the Dry Contact Input RIB provides the Class 2 low-voltage power required to activate the relay (self-powered).

This relay can optionally be powered through a separate pair of wires and the control output of the controller, or from a local power source. The relay contacts can be wired to switch another power-load or low-voltage load (see specifications for contact ratings) since input power and dry contact input is isolated from the relay contacts. These relays offer versatility. For example, model RIB21CDC can operate from a voltage ranging from 120Vac-277Vac, allowing these relays to be used for many installations. (Specifications for input power may vary with other models). View Dry Contact Relays.

Specialty Peripheral Devices

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If you cannot locate a device with the specifications or packaging configurations that you require, we would be happy to quote and design one for you. Controls Central can provide you with a product to fit your specific needs. Functional Devices, Inc. develops, manufactures, and produces special peripheral devices. In addition to its current product offerings, Functional Devices makes variations of its products or can design a unique device to meet your needs. Please contact us so that we may review your project and special requirements.  View Specialty Peripheral Devices.

Have you used any of these Functional Devices relays or specialty devices? Feel free to share your experiences using these relays and other products.

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