Lennox Brand [Lifetime Warranty] 50+7.5 uF MFD ±5% 370/440 VAC CBB65 CBB65B Dual Run Round Capacitor - Fits AC Unit Fan Motor, Heat Pump, Condenser
BlueStars 50+7.5 uF 370/440 VAC CBB65 dual run round capacitor for AC unit fan motor and condenser.
BlueStars 50+7.5 uF dual run round capacitor with dimensions and certification labels shown on infographic.
Specification chart for 50+7.5 uF 370/440 VAC dual run round capacitor with technical details.
Top view of 50+7.5 uF dual run capacitor showing C, HERM, and FAN terminal labels for AC unit motor compatibility.
BlueStars 50+7.5 uF dual run round capacitor with aluminum case and metalized polypropylene film construction.
Educational infographic showing how to choose a 50+7.5 uF dual run round capacitor for AC units.
Technician repairing an AC condenser unit with a 50+7.5 uF dual run round capacitor shown in the foreground.
Technician installing a 50+7.5 uF dual run round capacitor in an AC unit condenser.
Infographic showing wide range applications for 50+7.5 uF dual run capacitor in AC, refrigerator, heat pump, and compressor.
Infographic showing four easy installation steps for a 50+7.5 uF dual run round capacitor in an AC unit.
BlueStars 50+7.5 uF 370/440 VAC CBB65 dual run round capacitor for AC unit fan motor and condenser.
BlueStars 50+7.5 uF dual run round capacitor with dimensions and certification labels shown on infographic.
Specification chart for 50+7.5 uF 370/440 VAC dual run round capacitor with technical details.
Top view of 50+7.5 uF dual run capacitor showing C, HERM, and FAN terminal labels for AC unit motor compatibility.
BlueStars 50+7.5 uF dual run round capacitor with aluminum case and metalized polypropylene film construction.
Educational infographic showing how to choose a 50+7.5 uF dual run round capacitor for AC units.
Technician repairing an AC condenser unit with a 50+7.5 uF dual run round capacitor shown in the foreground.
Technician installing a 50+7.5 uF dual run round capacitor in an AC unit condenser.
Infographic showing wide range applications for 50+7.5 uF dual run capacitor in AC, refrigerator, heat pump, and compressor.
Infographic showing four easy installation steps for a 50+7.5 uF dual run round capacitor in an AC unit.
Lifetime Warranty

[Lifetime Warranty] 50+7.5 uF MFD ±5% 370/440 VAC CBB65 CBB65B Dual Run Round Capacitor - Fits AC Unit Fan Motor, Heat Pump, Condenser

Save 13%
0.00
$25.12
$28.89
$25.12
In stock
Fast delivery

Secure and trusted checkout with

  • Visa
  • Mastercard
  • American Express
  • PayPal
  • Diners Club
  • Discover
Contact for wholesale
🛠️
CONFIRM THE FIT FOR YOUR MODEL
Enter your model number

50+7.5 uf MFD ±5% 370 or 440 Volt AC CBB65B Dual Run Round Capacitor

Key Features

  • Capacitance: 50 + 7.5 Microfarad (MFD)
  • Tolerance: ±5%
  • Voltage Rating: 370 VAC or 440 VAC
  • Frequency: 50/60 Hz
  • Shape: Round
  • Construction: Oil-filled, metal case
  • Operating Temperature: -40°C to +85°C (-40°F to +185°F)
  • Terminals: 3 (Common, Fan, Hermetically Sealed Compressor)

Replaces / Cross-Reference Part Numbers

  • Functionally replaces any round or oval dual run capacitor with matching 50+7.5 MFD and 370V or 440V specifications.
  • Common part numbers include: P291-5074R, C35075R, USA2236, TRCD5075.

Compatibility & Fitment

  • Used in HVAC systems, air conditioners, and heat pumps to power the compressor and fan motor simultaneously.
  • Compatible with units from brands including Goodman, Carrier, Bryant, Trane, Lennox, Rheem, and more, provided the specifications match.
  • Dimensions: 1.97 inches (Diameter) x 5.59 inches (Overall Height). Verify physical space and mounting bracket compatibility before purchase.

When to Replace

  • Compressor or fan motor hums but will not start.
  • Outdoor unit fan is not spinning.
  • AC unit is not cooling efficiently.
  • Capacitor case is visibly swollen, bulging, or leaking fluid.
  • Capacitance measurement is outside the rated ±5% tolerance.

Installation Tips

  • Disconnect all electrical power to the HVAC unit before servicing.
  • Safely discharge the old capacitor by shorting the terminals with an insulated tool.
  • Note the wire positions on the C, FAN, and HERM terminals before removal.
  • Connect wires to the corresponding terminals on the new capacitor.
  • Secure the capacitor in the mounting bracket to prevent vibration.

FAQ

This capacitor is used in many air conditioning and heat pump outdoor units that require a dual run capacitor rated at 50/7.5 microfarads (MFD or uF) with a ±5% tolerance and a 370/440 VAC rating. It is typically used to run both the compressor and the condenser fan motor from one capacitor. Match the capacitance values exactly to your original part, and verify the voltage rating, terminal layout, and physical fit before ordering.
Yes, in many HVAC applications a 440 VAC capacitor can replace a 370 VAC capacitor if the microfarad ratings match exactly, such as 50+7.5 uF. A 440 VAC rated capacitor can handle the same job with a higher voltage rating. However, you should not replace a 440 VAC capacitor with a 370 VAC version unless the equipment manufacturer specifically allows it.
On a dual run capacitor, the 50 uF side is commonly used for the compressor and the 7.5 uF side is commonly used for the condenser fan motor. The terminals are usually marked C for common, HERM for compressor, and FAN for fan motor. Always confirm the terminal markings and wire locations on your existing capacitor before installation.
Common signs include the outdoor AC unit humming but not starting, the condenser fan blade not spinning or spinning only when pushed, the compressor struggling to start, intermittent shutdowns, warm air from the vents, or a visibly swollen or leaking capacitor. A weak capacitor may still allow occasional operation, so testing with a meter that reads capacitance is the best way to confirm failure.
Check your old capacitor label for all of these details: 50+7.5 uF, dual run type, round shape if required by your mounting strap, and 370 or 440 VAC. The microfarad rating must match exactly. The voltage rating must match or be higher. Also confirm the number of terminals and that the new part will fit inside the control compartment and existing bracket.
For someone familiar with HVAC electrical safety, replacement is usually a short job of about 15 to 30 minutes. Typical tools include a screwdriver or nut driver to open the access panel, needle-nose pliers for terminals, and a camera or phone to photograph wire positions before removal. Because capacitors can hold a charge even with power off, shut off disconnects and breakers and discharge the capacitor safely before handling it.
Run capacitors commonly fail from heat, age, voltage stress, heavy compressor starts, poor airflow through the condenser, or prolonged operation in high ambient temperatures. Loose terminals and vibration can also shorten life. If a replacement capacitor fails again quickly, the system should be checked for an overamping fan motor, hard-starting compressor, weak contactor, or airflow and coil-cleanliness issues.
Before replacing the capacitor, inspect the contactor for burned contacts, check the condenser fan motor for free rotation, look for bulging or overheated wire terminals, and verify the unit nameplate or original capacitor ratings. During installation, move one wire at a time or use a photo reference so each lead returns to the correct terminal: C, FAN, and HERM. Incorrect wiring can damage the motor or prevent the unit from starting.