Functional Devices
Control Systems & Sensors
Functional Devices, Inc. manufactures electronic components for HVAC and building automation systems. Since 1969, the company has developed products that connect control signals with equipment operation. Its RIB® relays support load switching, while current sensors provide feedback on electrical current draw. Power supplies and transformers provide control power, with enclosures and accessories available to support system assembly. Packaged designs and varied mounting options accommodate different equipment configurations, whether the project involves a new control panel or an upgrade to existing equipment.
The Experience Behind Every Recommendation
Behind every equipment solution is Havtech’s own established legacy of commercial HVAC expertise, driven by our decades of experience, extensive project history, and trusted industry relationships.
Product Categories
Products That Fit Your Needs
Functional Devices’ building automation components support reliable equipment control and monitoring, with installation options suited to HVAC systems and control panels.
RIB® Relays
RIB® relays switch electrical loads in response to control signals. Packaged, prewired options simplify installation, with configurations available to match control voltage and load requirements for HVAC and lighting applications.
Current Sensors
Current switches and transducers monitor electrical current draw in fan, pump, and other equipment circuits. Switches provide status signals, while transducers provide proportional feedback for building automation monitoring.
Power Supplies
Power supplies provide AC or regulated DC power for building control components. Output and mounting options help match controllers, sensors, and other connected devices to the control panel’s electrical requirements.
Transformers
Control transformers reduce incoming AC voltage to the level required by HVAC control circuits. Voltage, capacity, and mounting options support applications such as thermostats, relay coils, and zone valves.
What You Get When You Work With Us
Working with Havtech connects your team with Functional Devices product guidance and local building automation expertise. We help review control signals and electrical requirements to identify components suited to your equipment. Coordination with engineers and contractors supports integration planning, with attention to existing controls and installation needs. Whether you are assembling a new system or updating a control panel, our team helps connect product selection with your building’s operating requirements.
Applications and Industries
Designed for the Buildings You Work In
Functional Devices products support HVAC and building control systems in commercial facilities. Applications include fan and pump monitoring, equipment switching, and lighting control. Component selection reflects the building’s control configuration and electrical requirements, with options available for new installations and updates to existing equipment.
Find Your Local Partner
Proudly Representing Across the Region
Havtech partners with manufacturers to deliver innovative solutions across the Mid-Atlantic and beyond. With dedicated regional offices and expert teams, we bring industry-leading products and responsive support closer to you – wherever your projects take place.
9505 Berger Road
Columbia, Maryland 21046
Call Columbia Service and Sales at (301) 206-9225
24/7 Standard & Emergency Requests: For 24/7 Standard & Emergency Requests, call Columbia Service and Sales at (443) 832-1750
Fast Answers. Full Support. Real Results.
Get expert guidance, responsive service, and the confidence that your HVAC system is built to perform.