OEM Carrier Control Transformer 40VA 120V to 24V for Model C50A502761

This is the OEM factory-replacement control circuit transformer for the Carrier C50A502761 packaged unit, sourced directly to OEM specification under part number HT01BD236. The transformer steps down line voltage (120V) to the 24V AC signal that powers your thermostat, contactor coil, control board, and all low-voltage safety circuits. When this component fails, the entire control circuit goes dead — the thermostat loses power, the system will not respond to any call for heating or cooling, and no safety safeties can trip. It is often the first part to inspect when absolutely nothing in the system responds.

• Specs: 40VA rating | Primary: 120V AC | Secondary: 24V AC | OEM part number HT01BD236 | Direct drop-in replacement with factory-matched terminal configuration
• OEM vs Generic: OEM transformers are wound to exact VA ratings and insulation class required by Carrier. Undersized or off-tolerance generic transformers can overheat under full load, blow the control fuse repeatedly, or cause erratic thermostat behavior that mimics more expensive failures.
• Install difficulty: 2/5 — Disconnect power at the disconnect and breaker before starting. Tools needed: flathead and Phillips screwdrivers, needle-nose pliers, multimeter to confirm 24V output after installation. Label or photograph all wiring connections before removal.
• Warranty: 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed for the Carrier C50A502761 commercial packaged rooftop unit. Verify your existing transformer's VA rating and primary/secondary voltages on the unit data plate or wiring diagram before ordering. Our parts specialists are available to confirm fitment prior to purchase — same-day shipping ensures you're back up and running fast.