Functional Devices
Functional Devices TR20VA004 20VA Multi-Tap Control Transformer 277/240/208/120V to 24V
Functional Devices RIBU2SC 10 Amp Pilot Relay with Override SPST-N/O SPDT NEMA 1
Functional Devices RIBU2S2 Enclosed Pilot Relay 10 Amp 2 SPST-N/O with Override Switch
Functional Devices RIBXGTV10 Split Core Multi-Range Current Transducer 0-10 Vdc Output
Representative Photo, actual item may vary
Functional Devices RIBXGTA-ECM Split-Core Adjustable Current Switch 0.25-150A for ECM Motors
Functional Devices RIBXGTA Split-Core AC Current Sensor 0.75-150 Amp Adjustable
Functional Devices RIBXGHTF Split-Core AC Current Sensor 120V 0.5-150A Enclosed
Representative Photo, actual item may vary
Functional Devices RIBXGHTA Split Core Adjustable Current Switch 0.75-150 Amp 120VAC
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Functional Devices RIBXGHF Split Core Current Switch 0.5-150 Amp 120VAC Fixed Setpoint
Functional Devices RIBXGHA Split Core Adjustable Current Switch 0.75-150A 120VAC
Functional Devices RIBXGA Split-Core Adjustable Current Switch 0.75-150 Amp with Wire Leads
Functional Devices RIBXG21TA Enclosed Split-Core AC Sensor 120-277V 0.75-150A Adjustable
Functional Devices RIBXG21A Enclosed Split-Core AC Current Sensor 120-277V 0.75-150A Adjustable
Functional Devices RIBX24SBF Current Sensing Relay 20 Amp SPST with Override 24VAC/DC
Functional Devices RIBX24SBA Current Switch and Relay Combination 20 Amp SPST with Override
Functional Devices RIBX24BF Current Switch and Relay Combination 20 Amp SPDT 24VAC/DC
Functional Devices RIBX24BA Enclosed Relay with 20A Adjustable Current Switch
Functional Devices RIBW24B-EN3 EnOcean 902 MHz Enclosed Relay 20 Amp SPDT 24VAC/DC
Functional Devices RIBW01B-EN3 EnOcean 902 MHz Wireless Relay 20A SPDT 120VAC
Functional Devices RIBTW24B-BCAI BACnet Enclosed Relay 20 Amp SPDT 24Vac/dc with Analog Input
Representative Photo, actual item may vary
Functional Devices RIBTW2401B-BC BACnet MS/TP Network Relay Device SPDT Controller
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Functional Devices RIBT242B 20 Amp 2 SPDT Power Relay 24V AC/DC Hi/Lo Voltage Separation
Functional Devices RIBT2401B Enclosed Relay 20 Amp SPDT Hi/Low Separation 24VAC/DC/120VAC Coil
Functional Devices RIBMU2C Pilot Relay 2 SPDT 15 Amp 10-30 Vac/dc/120 Vac Track Mount
Functional Devices RIBMU1S Track-Mount Relay 15A SPST-NO with Override 10-30VAC/DC/120VAC
Functional Devices RIBMU1C 4-Track DIN Rail Mount Relay 15A SPDT 10-30VAC/DC/120VAC
Functional Devices TR75VA001 Transformer 75VA 120-24V Class II with Circuit Breaker
Functional Devices TR50VA022US 50VA Multi-Tap Transformer 120/208/240/277/480V to 24V Class 2
Functional Devices TR75VA007 Transformer 75VA 120/208/240/480V to 24V with Circuit Breaker Dual Hub
Functional Devices TR75VA005 Transformer 75VA Multi-Tap 480/240/208/120V to 24VAC with Circuit Breaker
Functional Devices TR75VA002 Transformer 75VA 120V to 24V AC with Circuit Breaker
Functional Devices TR40VA015 40VA Transformer 120/208/240V to 24V Class II UL Listed
Functional Devices RIBMN24S Track Mount Pilot Relay 15 Amp SPST with HOA Override 24VAC/DC
Functional Devices PSMN24DA Non-Isolated Linear DC Power Supply 24VAC Input 1.5-28VDC Adjustable Output
Representative Photo, actual item may vary
Functional Devices RIBMNLB-4NO AHU Fan Safety Alarm Logic Circuit 4-Input N/O Track Mount
Representative Photo, actual item may vary
Functional Devices RIBU2C-OR 10A 2SPDT Enclosed Pilot Relay 10-30VAC/DC & 120VAC Coil
Functional Devices RIBU2C-AND Enclosed Pilot Relay 10A 2 SPDT 10-30 VAC/DC 120 VAC Coil
Functional Devices RIBTWX2401B-BC BACnet MS/TP Network Relay Device 20A SPDT with Current Sensor
About Functional Devices
Functional Devices has built a strong reputation as a leading American designer and manufacturer of control devices for the HVAC, building controls, and energy management industries. Founded on the principle that reliable, precision-engineered components are the backbone of any well-functioning building system, Functional Devices has become a go-to name for contractors, engineers, and facilities managers who demand consistency and quality from their electrical control hardware.
What sets Functional Devices apart is their commitment to domestic manufacturing. Every product is designed and built in the United States, ensuring tight quality control and shorter lead times compared to overseas alternatives. Their catalog of over 200 products covers the critical electrical and control components that keep commercial and residential HVAC systems running safely and efficiently.
Transformers for HVAC and Building Controls
One of Functional Devices' most recognized product lines is their lineup of Transformers. These step-down control transformers are engineered specifically for HVAC applications, converting line voltage down to the 24VAC signal voltage that thermostats, zone valves, and control boards depend on. Functional Devices transformers are designed with built-in overcurrent protection and a range of VA ratings to match virtually any residential or commercial application.
Relays, Fan Sequencers & Automation Controls
Perhaps the product line Functional Devices is best known for is their Relays & Fan Sequencers. Their iconic RIB® (Relay in a Box) series revolutionized the industry by packaging a fully enclosed, plug-in relay into a compact, universal-mount enclosure — eliminating the need for a separate panel or DIN rail in many installations. Fan sequencers from Functional Devices help stage multi-speed blower motors and electric heating elements efficiently, reducing electrical stress and improving system longevity.
Motor & Electrical Parts and Accessories
Beyond their flagship lines, Functional Devices also offers a selection of Motor & Electrical Parts & Accessories that complement their control systems. These components are designed to integrate seamlessly with Functional Devices transformers and relays, making it straightforward to build or service a complete control circuit without sourcing parts from multiple vendors.
Accessory Power Relays
For applications requiring switched power control, Functional Devices produces Accessory Power Relays suited to a variety of load types. These relays provide dependable switching action for auxiliary equipment loads, and their robust construction reflects the same durability standards applied across the entire Functional Devices product range.
Why Choose Functional Devices?
- American-designed and manufactured for consistent quality and reliability
- Extensive product range covering transformers, relays, sequencers, and accessories
- Industry-leading RIB® relay platform with universal mounting flexibility
- Products engineered specifically for HVAC, building automation, and energy management systems
- Trusted by HVAC contractors, electrical engineers, and facilities professionals nationwide