Functional Devices, Inc. has been designing and manufacturing quality electronic devices in the United States of America since 1969. Our goal is to provide high quality products for the most reliable and economical solutions to the needs of our customers, along with world-class support from our sales and engineering experts. Current product offerings include relays, current sensors, power control, enclosures, power supplies, transformers, and accessories. Functional Devices has established itself as a leader in the HVAC, Building Controls, Energy Management, Energy Savings, Lighting Controls, and Wireless industries.



  • LED indicator
  • Multi-voltage coil input
  • Several different contact ratings
  • True override switch on load side of relay
  • High/low voltage separation

Network Compatible Devices


RIB® BACnet and LonWorks Network Compatible Devices can be hard wired and used instead of more expensive multi-output controllers when a few more control points are needed, and large controllers are too much for the job. They can also be used when control points are widely spread throughout the job site. These devices have been prepackaged to save the installer the time, trouble, and expense of buying separate components and assembling them on the job. Functional Devices also offers WiFi and EnOcean WIRELESS Network Compatible Devices that can act singly as a (LCS) load control switch or as part of a larger network.


Wireless Devices


EnOcean® enabled wireless relay receivers in both 120 and 277 Vac models work in conjunction with many switching devices that are EnOcean® enabled with 902 MHz transmitters.

Wireless wall switches, occupancy sensors, thermostats, key card switches, patio door switches, and one-way controller transmitters are all devices which can activate the RIB® wireless control relays by using EnOcean®'s "energy harvesting" technology. Energy harvesting refers to the process by which energy is captured and stored, then used to transmit a wireless signal, which in turn is received by RIB®'s wireless relay.


Current Sensors


Many Variations

  • Miniature Size
  • Self-calibrating
  • Relay / current sensor combinations
  • Adjustable or fixed
  • Track Mount Styles
  • Solid or split core
  • Voltage outputs
  • 4-20 mA regulation

Power Control


Enclosed Power Control Centers

  • Two 120 Vac grounded convenience outlets
  • 4 or 10 Amp Switch / circuit breaker
  • Outlets can be continuously powered or controlled by the switch / circuit breaker
  • Auxiliary outputs are provided for convenient control panel installations

Track Mount Circuit Breaker Switches

  • Track mount circuit breaker switches provide a convenient addition to control panels
  • Circuits can be low voltage (24 Vac) or line voltage (120 Vac)

Prepackaged Switches

  • Standard configurations to provide simple switching schemes
  • Labels can be ordered with custom content to fit your project

UPS Interface

Functional Devices provides a 550 VA commercial UPS along with an enclosure and an interface board, which allows the installer to hardwire line voltage to the provided UPS while giving the ability to hardwire the UPS to the final load.


Power Supplies



  • Class 2
  • On/off control
  • Overcurrent protection
  • LED power indicator
  • High/low voltage separation
  • 120 Vac convenience outlets
  • 40-500VA AC models
  • Finger-safe terminals

PSH300A & PSH500A - Perfect for VAV applications

  • 5 or 3 isolated 100 VA outputs
  • On/off circuit breaker switch for each output
  • UL Listed Class 2
  • Fully enclosed - perfect for central location


  • US manufactured line
  • UL Listed
  • Class 2
  • 20 VA - 375 VA
  • Foot or hub mounting
  • Single or dual hub
  • Split bobbin construction
  • Circuit breaker available


  • UL Listed
  • NEMA 1
  • NEMA 4
  • Variety of sizes
  • Numerous knock outs
  • Full hinge
  • Key locks


  • Subpanels
  • Mounting supplies
  • Replacement parts