Lennox 13H28 Transformer

The Lennox 13H28 Transformer is the designated OEM replacement for 51M4401, engineered for high-demand HVAC control voltage applications. Designed by Basler Electric (Model BE28868001), this 70VA transformer handles a primary input of 208/240V AC and steps it down to a stable 24V secondary output. This component is critical for powering low-voltage control circuits, indoor air handlers, and packaged unit control boards. It features a robust 3.5 Amp circuit breaker for essential overcurrent protection, preventing damage to downstream electronics during a short circuit. The foot mount design and color-coded wire leads—typically black (common), red (208V), and orange (240V) for the primary side—ensure a straightforward field installation for service technicians. This Class 2 transformer is built to maintain tight voltage regulation across 50/60Hz frequencies, ensuring compatibility with a wide range of legacy and modern Lennox commercial and residential equipment.

Key Benefits

• Direct OEM Compatibility: Serves as the precise 13H2801 successor to obsolete parts like 51M44, 65G49, and 93J71.
• Enhanced Hardware Protection: Integrated 3.5A circuit breaker acts as a resettable safety, protecting expensive control boards.
• High Power Capacity: The 70VA rating provides ample headroom for complex multi-stage systems and accessorized air handlers.
• Industrial Build Quality: Constructed with a durable metal frame and high-temp lead wires to withstand cabinet heat.

Common Questions

Is the 13H28 compatible with 208V and 240V systems?
Yes, this is a multi-tap primary transformer. Use the red lead for 208V primary voltage or the orange lead for 240V primary voltage applications.

What does the 70VA rating mean for my installation?
The 70VA power rating indicates the maximum apparent power the transformer can supply. It is a significant upgrade over standard 40VA units, allowing it to drive more contactors and relays without voltage sag.

Can I use this to replace a 51M4401 transformer?
Yes, the 13H28 is the direct replacement for 51M4401 and maintains the same footprint and electrical specifications for a seamless swap.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.