OEM Carrier Transformer 460V Primary 24V Secondary 75VA for Model TCHC2550HECMRAY600

This is the genuine OEM factory-replacement transformer (part number HT01BD702) for the Carrier TCHC2550HECMRAY600 commercial HVAC unit. The transformer steps down the 460V line-side voltage to the 24V control circuit voltage that powers your thermostat, contactor coils, and all low-voltage switching logic. When this transformer fails — due to a shorted control board, wiring fault, or age-related winding breakdown — the entire control circuit loses power: the system will not respond to thermostat calls, no contactors will energize, and no diagnostic LEDs will illuminate.

• Specs: 460VAC primary voltage | 24V AC secondary voltage | 75VA capacity | Steel core with copper windings | Compact form factor (approx. 4.30" × 3.25" × 3.50")
• OEM vs Generic: This is a genuine Carrier Factory Authorized Part (FAP). OEM transformers are wound to exact VA and impedance tolerances for your system. Undersized or off-tolerance generic transformers can cause nuisance tripping, voltage sag under load, and premature contactor coil failure.
• Install difficulty: 3/5 — This unit operates on 460V primary power. Disconnect and lock out all power before servicing. Tools needed: multimeter, flathead and Phillips screwdrivers, wire stripper/crimper. Always verify 24V output with a meter before reconnecting the control circuit. Installation by a licensed HVAC technician is strongly recommended.
• Warranty & Shipping: Backed by Carrier's OEM parts warranty. In stock — ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model TCHC2550HECMRAY600. Verify your unit's primary supply voltage (460V) and existing transformer VA rating on the equipment data plate before ordering. Need fitment confirmation? Our HVAC parts specialists are standing by to verify compatibility before you buy.