45 uF/MFD 370-440VAC Round Run Start Capacitor

45 uF/MFD 370-440VAC Round Run Start Capacitor

Key Features

• Capacitance: 45 Microfarad (uF/MFD)
• Tolerance: +/- 6%
• Voltage Rating: Dual rated for 370 VAC or 440 VAC
• Frequency: 50 / 60 Hz
• Shape: Round
• Case Material: Aluminum
• Dielectric Material: Metalized Polypropylene
• Terminals: 1/4 inch male quick-connect
• Safety Standard: Meets EIA-456-A specifications
• Operating Temperature: -40°C to 70°C

Replaces / Cross-Reference Part Numbers

• Replaces any single-value round capacitor with matching 45 uF capacitance and either a 370V or 440V rating.
• Universal replacement for capacitors used by brands such as Carrier, Goodman, Lennox, Rheem, Trane, York, and others.

Compatibility & Fitment

• For continuous duty in single-phase motor applications.
• Commonly used in air conditioner condenser units, heat pumps, and furnace blower motors.
• Also used for compressor motors, fan motors, and refrigeration systems.

When to Replace

• Motor hums but fails to start.
• Fan requires a manual push to begin rotating.
• AC compressor does not engage.
• Visible damage to the existing capacitor, such as a bulging or swollen case, or leaking fluid.
• Capacitance measures outside the specified tolerance when tested with a multimeter.

Installation Tips

• Disconnect all electrical power to the unit before servicing.
• Discharge the old capacitor by carefully shorting the terminals with an insulated-handle screwdriver or a discharge tool.
• Confirm the new capacitor's uF rating matches the original part.
• The voltage rating of the new capacitor must be equal to or higher than the original. A 440V capacitor can safely replace a 370V capacitor.
• Note the wire positions on the original terminals before disconnecting.
• Secure the new capacitor using the existing mounting bracket.