40 uF MFD 370/440 VAC CBB65A Round Run Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump
BlueStars 40 uF 370/440 VAC CBB65A round run capacitor for AC motors and heat pumps.
Four-step installation guide for CBB65A 40 uF run start capacitor on an AC unit.
Infographic showing two 40 uF 370/440 VAC CBB65A round run capacitors with signs indicating when to replace an AC unit.
BlueStars 40 uF 370/440 VAC CBB65A round run capacitor for AC and heat pump motors.
40 uF 370/440 VAC CBB65A round run capacitor with dimensions and certification logos shown.
Specification chart for 40 uF 370/440 VAC CBB65A round run capacitor with technical details and product image.
Top view of 40 uF 370/440 VAC CBB65A round run capacitor showing 2-terminal layout and connection labels.
BlueStars 40 uF 370/440 VAC round run capacitor with aluminum case and metalized film construction details.
Educational infographic showing how to choose a 40 uF 370/440 VAC CBB65A round run capacitor for AC and motor systems.
BlueStars 40 uF 370/440 VAC CBB65A round run capacitor for AC motor and heat pump repair.
Technician installing a 40 uF 370/440 VAC CBB65A round run capacitor into an AC unit.
Infographic showing 40uF 370/440VAC capacitor applications for AC, refrigerator, heat pump, and compressor motors.
BlueStars 40 uF 370/440 VAC CBB65A round run capacitor for AC motors and heat pumps.
Four-step installation guide for CBB65A 40 uF run start capacitor on an AC unit.
Infographic showing two 40 uF 370/440 VAC CBB65A round run capacitors with signs indicating when to replace an AC unit.
BlueStars 40 uF 370/440 VAC CBB65A round run capacitor for AC and heat pump motors.
40 uF 370/440 VAC CBB65A round run capacitor with dimensions and certification logos shown.
Specification chart for 40 uF 370/440 VAC CBB65A round run capacitor with technical details and product image.
Top view of 40 uF 370/440 VAC CBB65A round run capacitor showing 2-terminal layout and connection labels.
BlueStars 40 uF 370/440 VAC round run capacitor with aluminum case and metalized film construction details.
Educational infographic showing how to choose a 40 uF 370/440 VAC CBB65A round run capacitor for AC and motor systems.
BlueStars 40 uF 370/440 VAC CBB65A round run capacitor for AC motor and heat pump repair.
Technician installing a 40 uF 370/440 VAC CBB65A round run capacitor into an AC unit.
Infographic showing 40uF 370/440VAC capacitor applications for AC, refrigerator, heat pump, and compressor motors.
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40 uF MFD 370/440 VAC CBB65A Round Run Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump

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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.
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  • Step 1

    Step 1

    Turn off the power and locate the capacitor
  • Step 2

    Step 2

    Discharge any stored electricity by shorting the terminals
  • Step 3

    Step 3

    Take a photo or note how the wires connect. Disconnect wires & install the new capacitor.
  • Step 4

    Step 4

    Reassemble and test

FAQ

This capacitor is dual-rated, meaning it is designed to operate safely at either 370 volts or 440 volts. It is perfectly safe to use this 440V-rated capacitor as a replacement for an original 370V capacitor of the same microfarad (uF) rating, as the higher voltage rating provides a greater safety margin and durability.
Common signs of a failing capacitor include a humming sound from the motor without it starting, the fan or motor struggling to reach full speed, or the unit failing to start entirely. Visually, a failed capacitor often shows signs of bulging at the top, leaking oil, or a burnt, acrid smell.
Before installation, always discharge the old capacitor using an insulated screwdriver across the terminals. It is also a good practice to inspect the contactor for pitted or burnt points, as a failing contactor can cause premature capacitor failure.
The replacement process is straightforward and typically requires only a screwdriver to access the service panel and a pair of needle-nose pliers to remove and reattach the spade connectors. The entire process usually takes 10 to 15 minutes.
Capacitors are heat-sensitive components. Over time, the internal dielectric material degrades due to the high ambient temperatures inside the outdoor unit, as well as the constant electrical stress of starting and running the motor. Exposure to extreme weather and age are the primary factors in their eventual failure.