OEM Carrier Control Transformer 50VA 120/208/240V–24V for Model YAC48110YAC203AT

The Carrier P201-35150 is the factory-specified step-down control transformer for the YAC48110YAC203AT packaged unit. Its job is to reduce incoming line voltage — 120, 208, or 240 VAC — down to a safe 24V for the low-voltage control circuit, powering the thermostat, control board, contactor coil, and all system safeties. When this transformer fails, the entire control circuit goes dead: the thermostat goes blank, the system won't respond to any calls, and absolutely nothing turns on. If your unit has blown a 3A fuse on the board repeatedly, a shorted transformer is the most common cause.

• Specs: 50 VA rating | Primary: 120 / 208 / 240 VAC multi-tap | Secondary: 12 / 24 VAC | 60 Hz single phase | CSA listed | Dimensions: 3.8"L × 3.1"W × 2.2"H
• OEM vs Generic: This OEM Carrier/Totaline unit is wound to exact factory VA and voltage tolerances. Under-rated generic transformers run hot, trip on thermal overload, and shorten control board life — the savings aren't worth it on a 50VA part.
• Install difficulty: 3/5 — Line voltage is present. Always shut off power at the disconnect AND the breaker before servicing. Tools needed: multimeter (verify 0V before touching wires), 1/4" nut driver, needle-nose pliers. Label all wires before disconnecting. Secondary wires (24V side) connect to C and R on the control board.
• Warranty: 1-year OEM factory warranty. In stock and ships same business day from our warehouse.

Compatibility: Direct OEM replacement for Carrier model YAC48110YAC203AT. Part number P201-35150 is a Carrier/Totaline Factory Authorized Part. Confirm your unit's data plate lists a 50VA, 120/208/240V primary transformer before ordering. Need fitment verification? Our team confirms compatibility before you buy — no guesswork.