Functional Devices Transformers
Functional Devices TR100VA002 Transformer 100VA 120V-24V Dual Hub Class 2 with Circuit Breaker
Functional Devices TR50VA003 Transformer 50VA 208/240V to 24V Dual Hub Class 2
Functional Devices PSMN500A Power Supply 120/240/277/480V to 24VAC Modular Multi-Tap UL Class II
Functional Devices PSH75AB10 75VA Enclosed Power Supply 120/208/240V to 24VAC UL Class II with 10A Breaker
Representative Photo, actual item may vary
Functional Devices PSH75A 75VA Multi-Tap Power Supply Transformer 24VAC UL Class 2
Functional Devices PSH500A-LVC Enclosed 500VA Power Supply with 5 Class 2 Outputs
Functional Devices PSH500A 500VA Enclosed Power Supply with Five 100VA Class 2 Outputs
Functional Devices PSH300A-LVC 300VA Power Supply with Three 24VAC Class 2 Outputs
Functional Devices PSH300A Enclosed Power Supply 120/240/277/480V to 24VAC 3-100VA UL Class 2
Functional Devices PSH24DWB10 Enclosed Power Supply to with Breaker Transformers - 120VAC 24VDC 2.5A 10A
Functional Devices PSH100AW 100VA 120V to 24V Transformer UL Class 2 Power Supply
Functional Devices PSH100AB10 Enclosed Power Supply to with Breaker Transformers - 100VA 120V 24VAC 10A
Functional Devices PSH100A100AB10 Dual Power Supply Transformer 120V-24VAC 100VA with Circuit Breaker
Functional Devices PSH100A Enclosed 100VA UL Class 2 Power Supply 120VAC to 24VAC
Representative Photo, actual item may vary
Functional Devices TR175VA003 Transformer 175VA 120V to 24VAC with Thermal Fuse
Functional Devices TR150VA008 Control Transformer 150VA 208-480V Primary 120V Secondary
Functional Devices TR100VA009US Transformer 96VA 120/208/240/277/480-24V Class 2 UL Listed DIN Rail
Functional Devices TR100VA004 Transformer 100VA Multi-Voltage 120/240/277/480V to 24V Dual Hub
Functional Devices TR100VA001 Transformer 100VA 120V to 24V Single Hub Class 2 UL Listed
Functional Devices TR40VA004 Transformer 40VA 277/240/208/120V to 24VAC Multi-Mount
Functional Devices TR40VA003 Transformer 40VA 24V Primary 24V Secondary Class 2
Functional Devices TR20VA004 20VA Multi-Tap Control Transformer 277/240/208/120V to 24V
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
Representative Photo, actual item may vary
Functional Devices PSH40AB10 Enclosed Single 40VA 120V to 24VAC UL Class 2 Power Supply with 10A Main Breaker
Functional Devices TR20VA007 277V to 24V 20VA Control Transformer Foot and Hub Mount
Functional Devices TR20VA003 Control Transformer 20VA 24V to 24V Single Hub Mount
Functional Devices TR100VA001-28 100VA 120V to 24V Control Transformer with 28-Inch Leads
Functional Devices PSH450DB10-LVC Fully Enclosed Power Supply 450VA 5-Output 120 to 24VAC
Representative Photo, actual item may vary
Functional Devices Transformers: Precision Power for Controls & Automation
Functional Devices has built a strong reputation as a specialist in control-circuit power solutions, and their line of Transformers sits at the heart of that expertise. Designed primarily to serve HVAC control systems, building automation, and low-voltage signaling applications, Functional Devices transformers are engineered to deliver consistent, clean power in demanding commercial and industrial environments.
What Sets Functional Devices Transformers Apart
Unlike commodity transformers, Functional Devices builds their units with control-circuit integration in mind. Many models in their transformer lineup are UL Listed and comply with Class 2 power-limiting requirements — an important safety consideration for low-voltage control wiring in commercial buildings. Their transformers are commonly multi-tap on the primary side, accepting a range of input voltages (typically 120, 208, 240, and 277 VAC) while delivering a stable 24 VAC output on the secondary side. This flexibility makes them particularly well-suited for retrofits and new installations alike, where the supply voltage may vary from one panel to the next.
Functional Devices is perhaps best known for their RIB® (Relay in a Box) product ecosystem, and their transformer offerings are engineered to pair seamlessly with that platform. Whether you need a standalone step-down transformer to power a thermostat circuit or a unit designed to mount alongside a relay module, Functional Devices provides form factors — including plug-in, DIN rail, and enclosure-mount styles — that integrate cleanly into control panels.
Key Features to Know When Shopping
- Class 2 Compliance: Many models meet NEC Class 2 power-limiting requirements, reducing conduit and wiring requirements in eligible installations.
- Multi-Tap Primary: Broad input voltage compatibility (120–277 VAC) suits a wide range of commercial power distribution scenarios.
- 24 VAC Output: The industry-standard secondary voltage for HVAC thermostats, damper actuators, and control boards.
- Compact Form Factors: Plug-in and panel-mount designs allow for flexible installation inside enclosures or directly at the load.
- UL Listing: Third-party safety certification provides confidence for inspected commercial and industrial installations.
Typical Applications
Functional Devices transformers are a go-to solution for HVAC technicians, electrical contractors, and building automation integrators. They are commonly used to power zone controllers, thermostats, VAV box actuators, economizer controls, and other 24 VAC devices throughout commercial buildings. Their reliability and straightforward installation make them a trusted choice when downtime is not an option.
With 13 transformer models available, the Functional Devices transformer lineup covers a practical range of VA ratings and mounting configurations. Whether you are specifying a new DDC system or replacing a failed transformer on an existing rooftop unit, there is likely a Functional Devices model suited to the task. Browse the full Transformers category or explore the complete Functional Devices catalog to find the right unit for your application.