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

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

Key Features

• Capacitance: 40 Microfarad (µF/MFD)
• Tolerance: ±5% to ±6%
• Voltage Rating: Dual 370V / 440V AC
• Frequency: 50/60 Hz
• Shape: Round
• Construction: Aluminum case, steel cover
• Terminals: 1/4 inch male quick-connect
• Operating Temperature: -40° C to 85° C (-40° F to 185° F)
• Safety Standard: UL recognized, 10,000 AFC protected
• Dielectric: Non-PCB, metalized polypropylene film

Replaces / Cross-Reference Part Numbers

• Replaces any round single-value capacitor with a 40 MFD rating and a voltage of 370V or 440V.
• Compatible with industry part numbers including CBB65, 97F series, and others with matching specifications.
• Substitutes for capacitors from multiple brands including Genteq, MARS, Packard, and Aerovox.

Compatibility & Fitment

• Used in single-phase motor applications including HVAC compressors, condenser fan motors, furnace blowers, and heat pumps.
• Physical dimensions are approximately 2.0 inches in diameter and 4.0 inches in height. Verify space in your unit before ordering as dimensions may vary slightly.
• This is a single-value capacitor and is not a direct replacement for dual-run capacitors (e.g., 40/5 MFD) that have three separate terminal posts.

When to Replace

• Motor hums but does not start or has difficulty starting.
• Fan or blower requires a manual push to begin spinning.
• Visible signs of damage on the existing capacitor, such as a swollen or bulging top, or fluid leakage.
• Reduced performance or speed from the motor or compressor.

Installation Tips

• Disconnect all electrical power to the equipment before beginning work.
• Safely discharge the existing capacitor by carefully shorting across the terminals with an insulated screwdriver.
• Note or photograph the wire connections before removing the old capacitor.
• Connect the wires to the new capacitor in the same configuration. Polarity does not apply to AC run capacitors.
• Secure the new capacitor in place using the original mounting bracket or strap.
• Professional installation is recommended for those unfamiliar with electrical component replacement.