Functional Devices, Inc. is expanding its transformer lineup with the TIB Series power supplies, a family of DIN rail mountable, UL Listed Class 2 transformers designed to bring a cleaner, faster installation experience to HVAC control panels and building automation enclosures.
The TIB Series is available in three models: the TIB40A (40VA), TIB50A (50VA), and TIB100A (96VA), all sharing the same compact form factor, pluggable terminal design, and 10-year warranty that Functional Devices backs across its product lineup.
What Makes the TIB Series Different
DIN Rail Mounting
The TIB® Series mounts directly to standard 35mm DIN rail—the same rail used for breakers, terminal blocks, and other panel components. With a newly redesigned, precision-fit DIN channel that matches the exact width of the rail, the TIB® snaps securely into place with zero wobble. Installation remains completely tool-free and effortless. For removal, a newly integrated, high-retention latch spring ensures the mechanism always stays perfectly in place and under optimal pressure; simply use a screwdriver to manually pull back the latch for a quick release.
For panel builders working in tight enclosures or on dense panel builds, this matters. Traditional toroidal or open-frame transformers require dedicated mounting space, hardware, and wiring routing that adds time to every build. The TIB® Series fits into the panel the same way everything else does.
Pluggable Terminals
The TIB® Series uses pluggable terminal connections for both high-voltage and low-voltage wiring. Pluggable terminals do two things that wire nuts and hardwired connections don't: they make initial wiring faster, and they make troubleshooting and maintenance significantly easier.
When you need to check voltage at the transformer, pluggable terminals give you clean, accessible test points with a meter. When a panel needs to be serviced or a transformer swapped in the field, the connections unplug cleanly rather than requiring wire nuts to be removed and reinstalled. For contractors doing ongoing service work on panels they built, that's a real practical advantage.
UL Listed Class 2—Assists Panel UL Compliance
The TIB® Series carries UL Listed status as a Class 2 transformer. Beyond the standard benefits of UL Listing for field installation acceptance, the use of terminals rather than wire nuts on a listed transformer assists in achieving UL compliance for the panel as a whole. For panel builders building UL 508A-listed panels, this is a meaningful specification point.
Compact Form Factor
The TIB® Series dimensions—4.315" × 3.112" × 3.255"—are substantially more compact than traditional enclosed transformers at equivalent VA ratings. In panels where space is at a premium, that reduction in footprint translates directly into panel size reduction or additional space for other components.
10-Year Warranty
Every TIB® Series transformer carries Functional Devices' 10-year warranty—the same coverage that backs the RIB® relay lineup. For contractors and panel builders specifying components that will go into buildings for decades, that warranty depth reflects the product quality and manufacturing standards behind it.
TIB Series Model Overview
Who the TIB Series Is For
Panel builders and OEM engineers will find the TIB® Series most immediately useful. The DIN rail form factor, pluggable terminals, and compact dimensions are all features that matter most when you're building panels repeatedly and looking for components that speed up the build process without compromising quality or compliance.
HVAC and BAS contractors building or maintaining field control panels benefit from the same features in a service context—faster wiring, cleaner test access, and a transformer that fits into the same DIN rail ecosystem as the RIB® relays, terminal blocks, and breakers already in the panel.
The TIB® Series fits naturally into the broader RIB® Trifecta of Relays, Current Sensors, and Power Supplies, giving contractors and panel builders a cohesive set of Functional Devices components that work together in HVAC, BAS, lighting, and emergency control applications.
Frequently Asked Questions
What is the TIB® Series?
The TIB® Series is a family of DIN rail mountable, UL Listed Class 2 power supply transformers from Functional Devices, available in 40VA (TIB40A), 50VA (TIB50A), and 96VA (TIB100A). They feature pluggable terminals, a compact form factor, and a 10-year warranty.
What does “Class 2” mean for a transformer?
A Class 2 transformer is limited in its output voltage and power by UL and NEC requirements—specifically, the output is limited to 30V and 100VA under NEC Article 725. Class 2 circuits are treated as low-hazard control circuits, which simplifies wiring requirements and allows for reduced wiring methods in many applications. The TIB Series is UL Listed as Class 2, making it suitable for BAS, HVAC control, and lighting control applications that require Class 2 power.
What VA rating should I specify?
VA (volt-ampere) rating is the transformer's output capacity. Add up the VA loads of all devices powered from the transformer's secondary—relay coils, actuators, sensors, controller power—and select a model with enough headroom above that total. The TIB40A (40VA) suits lighter control circuits; the TIB50A (50VA) provides additional headroom for mid-density panels; the TIB100A (96VA) handles larger panel builds with multiple devices on the secondary.
What DIN rail do I need for TIB® Series installation?
The TIB® Series mounts on standard 35mm DIN rail. Functional Devices offers the ADIN35 (35mm × 7.5mm × 1m perforated DIN rail) and ADIN35ES (end stops) as accessories for panel builders who need rail hardware alongside the transformer.
Where can I buy the TIB® Series?
TIB® Series transformers are available through Functional Devices' authorized distributor network. Use the distributor locator to find a supplier near you, or contact Functional Devices at (800) 888-5538 for purchasing assistance.