Carrier Brand 45+7.5 uF MFD 370/440 VAC Round Dual Run Capacitor CBB65 CBB65A - Fits AC Unit Fan Motor, Heat Pump
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor for AC unit fan motor and heat pump.
Step-by-step installation guide for 45+7.5 MFD dual run capacitor on an AC unit fan motor.
Informational graphic showing when to replace 45+7.5 uF 370/440 VAC round dual run capacitors for AC units.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor for AC unit and heat pump motor.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor with dimensions labeled for AC unit and heat pump repair.
Specification chart for 45+7.5 uF 370/440 VAC round dual run capacitor for AC unit and heat pump motors.
Top view of 45+7.5 MFD dual run capacitor showing C, HERM, and FAN terminal labels for AC unit and heat pump motors.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor with aluminum case and metalized film construction details.
Educational infographic for 45+7.5 uF 370/440 VAC round dual run capacitor showing selection guide and product specs.
Technician installing a 45+7.5 uF 370/440 VAC round dual run capacitor into an AC unit.
Technician installing a 45+7.5 uF 370/440 VAC round dual run capacitor in an AC condenser unit.
Infographic showing applications for 45+7.5 MFD dual run capacitor in AC units, refrigerators, heat pumps, and compressors.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor for AC unit fan motor and heat pump.
Step-by-step installation guide for 45+7.5 MFD dual run capacitor on an AC unit fan motor.
Informational graphic showing when to replace 45+7.5 uF 370/440 VAC round dual run capacitors for AC units.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor for AC unit and heat pump motor.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor with dimensions labeled for AC unit and heat pump repair.
Specification chart for 45+7.5 uF 370/440 VAC round dual run capacitor for AC unit and heat pump motors.
Top view of 45+7.5 MFD dual run capacitor showing C, HERM, and FAN terminal labels for AC unit and heat pump motors.
BlueStars 45+7.5 uF 370/440 VAC round dual run capacitor with aluminum case and metalized film construction details.
Educational infographic for 45+7.5 uF 370/440 VAC round dual run capacitor showing selection guide and product specs.
Technician installing a 45+7.5 uF 370/440 VAC round dual run capacitor into an AC unit.
Technician installing a 45+7.5 uF 370/440 VAC round dual run capacitor in an AC condenser unit.
Infographic showing applications for 45+7.5 MFD dual run capacitor in AC units, refrigerators, heat pumps, and compressors.
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45+7.5 uF MFD 370/440 VAC Round Dual Run Capacitor CBB65 CBB65A - Fits AC Unit Fan Motor, Heat Pump

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45+7.5 MFD uf 370 or 440 Volt VAC Round Dual Run Capacitor CBB65A

Key Features

  • Capacitance Rating: 45 + 7.5 Microfarad (MFD/uF)
  • Voltage Rating: 370 or 440 Volts AC (VAC)
  • Capacitance Tolerance: ±6%
  • Operating Frequency: 50/60 Hz
  • Operating Temperature Range: -40°C to +70°C (-104°F to +158°F)
  • Case Material: Aluminum, round case design
  • Dimensions: 2.36 in Diameter x 4.73 in Height (60 mm x 120 mm)
  • Terminals: 3-terminal design for Common (C), Fan (F), and Compressor (HERM)
  • Safety: Internal pressure-sensitive interrupter; Non-PCB dielectric fluid
  • Compliance: Meets EIA-456-A industry standards for 60,000 hours of operational life

Replaces / Cross-Reference Part Numbers

  • This is a universal replacement for round dual run capacitors with matching specifications.
  • Replaces any capacitor with a 45/7.5 MFD rating and a voltage of 370V or 440V.
  • Can be used to replace a 370V rated capacitor, as 440V is a higher voltage rating. Do not use a 370V to replace a 440V capacitor.

Compatibility & Fitment

  • Designed for heavy-duty, continuous use in HVAC systems.
  • Powers both a compressor motor (45 MFD) and a fan motor (7.5 MFD) simultaneously.
  • Commonly used in residential and commercial air conditioner (AC) condensing units and heat pumps.
  • Verify physical dimensions to ensure proper fit within the unit's mounting bracket and available space.

When to Replace

  • Outdoor unit produces a humming sound, but the compressor or fan fails to start.
  • Fan blades do not spin without a manual push-start.
  • AC system blows warm air or fails to cool.
  • Visible signs of failure on the existing capacitor, such as a swollen or bulging top, rust, or fluid leakage.
  • Frequent tripping of the circuit breaker when the AC unit attempts to start.

Installation Tips

  • Disconnect all electrical power to the HVAC unit before servicing.
  • Safely discharge the stored energy from the old capacitor by shorting the terminals with an insulated-handle tool.
  • Note or photograph the wire connections to the C, F, and HERM terminals before removing the old part.
  • Ensure the MFD and voltage ratings of the replacement part match the original specifications.
  • Secure the new capacitor firmly in the mounting strap to prevent damage from vibration.
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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

Common symptoms of a failing capacitor include the AC unit failing to start, a humming sound coming from the condenser without the fan spinning, or the fan motor running slowly. If the top of the capacitor appears domed or swollen, or if you notice a burnt smell near the unit, it is likely time for a replacement.
This capacitor is a universal replacement for any dual run capacitor with a 45/7.5 MFD rating. It is designed to operate at both 370V and 440V. As long as your existing capacitor matches these MFD specifications, this unit will function correctly in your AC unit, heat pump, or condenser fan motor.
A capacitor rated for 440V can safely replace a 370V capacitor, but a 370V capacitor should never be used to replace a 440V unit. Because this capacitor is rated for 440V, it is versatile enough to be used in systems requiring either voltage specification.
Installation is generally straightforward for those comfortable working with electrical components. You will need a screwdriver to access the service panel and a pair of insulated needle-nose pliers. Expect the process to take about 15 to 30 minutes. Always ensure the power to the HVAC unit is completely disconnected at the breaker before beginning.
Before removing the old capacitor, take a photo of the wiring connections to ensure the new one is wired identically. Most importantly, you must discharge the old capacitor by placing an insulated screwdriver across the terminals to bridge them, as they can hold a dangerous electrical charge even after the power is turned off.
Capacitors are sensitive to heat and electrical surges. Excessive heat inside the condenser cabinet, frequent power cycling, or aging internal components are the most common causes of failure. Ensuring your condenser coils are clean and free of debris helps the unit run more efficiently, which reduces the thermal stress on the capacitor.