OEM Carrier Single Run Capacitor 45 MFD 440V for Model YAC48140YAC103T

This OEM single run capacitor is the factory-specified replacement for the Carrier YAC48140YAC103T packaged or split-system unit. The run capacitor stores and releases the precise electrical charge needed to start and sustain the compressor motor during every cooling cycle. When it degrades or fails, you'll typically notice the system humming but not starting, blowing warm air, short-cycling, or tripping on high-pressure lockout — all classic signs of capacitor failure. This listing covers OEM part number P291-4504 (45 MFD 440V oval, primary compressor run capacitor) and cross-references P291-0753 (7.5 MFD 370V fan run capacitor) — verify your unit's data plate and wiring diagram to confirm which capacitor requires replacement before ordering.

• Specs — P291-4504: 45 MFD (microfarad) | 370/440V rated | Oval case | 4.9" can height | Factory ±5% tolerance | 50/60 Hz | RoHS compliant | UL approved
• Specs — P291-0753 (cross-ref): 7.5 MFD | 370V rated | Oval case | Replaces HC91CA007, GE 27L566
• OEM vs Generic: OEM Totaline/Carrier capacitors are subjected to 100% electrical testing and proven to 60,000 service hours of reliability. Generic aftermarket units often carry a wider ±10% MFD tolerance, which accelerates compressor wear, reduces efficiency, and shortens motor life — especially critical in a 4-ton packaged system running long cycles.
• Install difficulty: 2/5 — Always discharge the capacitor fully before touching terminals (use a 20,000-ohm resistor or insulated screwdriver across terminals). Tools needed: 1/4" nut driver, needle-nose pliers, multimeter set to capacitance. Photograph all wiring connections before disconnecting. Match MFD and voltage ratings exactly to your data-plate specification.
• Warranty: 1-year OEM factory warranty. In-stock — ships same business day from our warehouse.

Compatibility: Engineered as a direct OEM replacement for Carrier model YAC48140YAC103T. Also cross-references Carrier/Totaline part numbers HC91DA045, HC90BB045, HC96RH045, HC96LT045, HC96SV045, HC91DB045, and P281-4504. Always verify the MFD rating, voltage, and shape against your unit's data plate before ordering. Have a fitment question? Our HVAC parts team confirms compatibility before you buy.