The Functional Devices TIB100A is a housed, DIN rail-mountable 24VAC Class 2 power supply with a 96VA output rating, 120VAC primary input, and integrated circuit breaker overcurrent protection. Designed for HVAC control panels and building automation applications, the TIB100A snaps directly onto standard 35mm DIN rail — eliminating the foot-mount hardware, conduit hubs, and exposed wiring of traditional open-frame transformers. Pluggable terminal connections make wiring fast and servicing clean.
Best for: HVAC control panels, BAS panel builds, and any application requiring a compact, self-contained 24VAC Class 2 power supply that mounts directly to DIN rail without additional hardware.
The TIB100A is backed by Functional Devices' industry-leading 10-year warranty — the longest standard warranty in the RIB product line. Functional Devices reports a field failure rate of approximately 1 in 16,000 units, reflecting the reliability built into every product they manufacture.
Why the TIB100A — Housed DIN Rail Transformer vs. Open-Frame
Traditional 24VAC control transformers require foot-mounting to the panel back plate, conduit hubs for wire entry, and careful routing of exposed primary and secondary wiring. The TIB100A eliminates all of that. Its patent-pending housed design snaps directly onto 35mm DIN rail alongside other panel components, with pluggable screw terminals for both primary and secondary connections. The result is a cleaner, faster, and more professional panel build — particularly on projects where multiple panels are being built to the same layout. The integrated circuit breaker also eliminates the need for a separate fuse block on the primary side.
35mm DIN Rail Snap-On Mount
Mounts directly to standard 35mm x 7.5mm DIN rail with no additional hardware. Sits alongside contactors, relays, and other DIN rail components for a clean, organized panel layout. Compatible with Functional Devices ADIN35 DIN rail and ADIN35ES end stops (sold separately).
Integrated Circuit Breaker
Built-in circuit breaker provides overcurrent protection on the primary side — eliminating the need for a separate fuse block or disconnect. Resettable without replacing a fuse, which reduces service time in the field. Protects both the transformer and connected 24VAC control circuits.
Pluggable Terminal Connections
Both primary (120VAC) and secondary (24VAC) connections use pluggable screw-type terminals. Terminals can be disconnected from the unit for wiring before installation, then plugged in — speeding up panel build time and simplifying troubleshooting or replacement without disturbing connected wiring.
UL Class 2 Listed
Listed to UL5085-3 as a Class 2 power supply and UL508 for industrial control equipment. Also carries C-UL (Canadian), CE (European), and RoHS approvals. The Class 2 rating limits output power to levels that do not require additional overcurrent protection on secondary wiring under NEC Article 725.
Installation Note — Neutral Terminal
On the 120VAC primary side, the Neutral terminal is marked [No Connect] — it is present on the housing but is not internally connected and should be left unused. Connect Line (120VAC hot) to the Line terminal and leave Neutral disconnected. On the 24VAC secondary side, Neutral is in phase with Com. Output derating may exceed 20% at elevated ambient temperatures or due to heat buildup in enclosed panels — account for this when sizing for loads near the 96VA rating.
| Specification | Value |
|---|---|
| Part Number | TIB100A |
| VA Rating | 96 VA |
| Primary Input | 120 VAC, 50/60 Hz |
| Secondary Output | 24 VAC |
| Neutral (Primary) | No Connect — not internally wired |
| Secondary Neutral | In phase with Com |
| Overcurrent Protection | Integrated Circuit Breaker |
| Mounting | 35mm x 7.5mm DIN Rail (snap-on) |
| Dimensions | 4.315” x 3.112” x 3.255” |
| Max Ambient Temperature | 40°C (104°F) |
| Approvals | Class 2 UL5085-3 Listed, UL508, C-UL, CE, RoHS |
| Origin | Made of US and non-US parts |
| Warranty | 10 Years |
| Accessories | ADIN35 (DIN Rail), ADIN35ES (End Stops) — sold separately |
| Patent Status | Patent Pending |
HVAC Control Panels
24VAC Class 2 supply for BAS controllers, relays, actuators, and sensors mounted on DIN rail in the same panel
Building Automation Systems
Powers 24VAC BAS field controllers, input/output modules, and networked devices from a single Class 2 source
Relay Panel Power Supply
Provides isolated 24VAC supply for RIB relay panels and Functional Devices control assemblies
VAV / Zone Control Panels
Compact DIN rail footprint fits neatly in smaller zone control enclosures alongside VAV controllers and actuators
Retrofit Panel Builds
Replaces foot-mount open-frame transformers in retrofits where DIN rail organization and clean wiring are priorities
Multi-Panel Projects
Consistent, repeatable DIN rail placement makes it ideal for projects where multiple identical panels are being built
- VA Rating:
- 100 VA
- Primary Voltage:
- 120 VAC
- Secondary Voltage:
- 24 VAC
