Emerson Brand 55 uF MFD 370/440 VAC CBB65 Round Run Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor for AC motors and heat pumps.
Four-step installation guide for 55 uF 370/440 VAC CBB65 round run start capacitor for AC and heat pump units.
Infographic showing two 55 uF 370/440 VAC CBB65 round run capacitors and signs indicating when to replace an AC capacitor.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor for AC and heat pump systems.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor with dimensions and certification labels.
Technical specification chart for 55 uF 370/440 VAC CBB65 round run capacitor with product details.
Top view of 55 uF 370/440 VAC CBB65 run capacitor showing 2-terminal layout and connection labels.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor with aluminum case and metalized film construction.
Educational infographic showing how to choose a 55 uF 370/440 VAC CBB65 round run capacitor for AC and motor systems.
Technician repairing an AC condenser unit with a 55 uF 370/440 VAC CBB65 round run capacitor.
Technician installing a 55 uF 370/440 VAC CBB65 round run capacitor into an AC unit.
Infographic showing wide range applications for 55 uF 370/440 VAC run capacitor in AC, refrigerator, and heat pump units.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor for AC motors and heat pumps.
Four-step installation guide for 55 uF 370/440 VAC CBB65 round run start capacitor for AC and heat pump units.
Infographic showing two 55 uF 370/440 VAC CBB65 round run capacitors and signs indicating when to replace an AC capacitor.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor for AC and heat pump systems.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor with dimensions and certification labels.
Technical specification chart for 55 uF 370/440 VAC CBB65 round run capacitor with product details.
Top view of 55 uF 370/440 VAC CBB65 run capacitor showing 2-terminal layout and connection labels.
BlueStars 55 uF 370/440 VAC CBB65 round run capacitor with aluminum case and metalized film construction.
Educational infographic showing how to choose a 55 uF 370/440 VAC CBB65 round run capacitor for AC and motor systems.
Technician repairing an AC condenser unit with a 55 uF 370/440 VAC CBB65 round run capacitor.
Technician installing a 55 uF 370/440 VAC CBB65 round run capacitor into an AC unit.
Infographic showing wide range applications for 55 uF 370/440 VAC run capacitor in AC, refrigerator, and heat pump units.
Lifetime Warranty

55 uF MFD 370/440 VAC CBB65 Round Run Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump

Save 13%
0.00
$20.40
$23.46
$20.40
Out of 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

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

Key Features

  • Capacitance: 55 Microfarad (µF/MFD)
  • Voltage Rating: 370V or 440V AC
  • Tolerance: ±6%
  • Frequency: 50/60 Hz
  • Shape: Round
  • Construction: Oil-filled metal can
  • Terminals: ¼ in. male quick-connect
  • Safety: Contains no Polychlorinated Biphenyls (PCBs)
  • Protection: Features an internal pressure-sensitive interrupter
  • Operating Temperature: -40°C to +70°C

Replaces / Cross-Reference Part Numbers

  • C355R
  • C455R
  • 97F9042
  • 97F9010
  • 12752

Compatibility & Fitment

  • Designed for continuous duty in motor run applications.
  • Used in air conditioner condensers, heat pumps, furnace blowers, and other single-phase AC motors.
  • Compatible with systems specifying either a 370VAC or 440VAC capacitor. A 440VAC capacitor can safely replace a 370VAC unit.

When to Replace

  • The motor hums but will not start or struggles to start.
  • The fan or compressor fails to turn on.
  • Visible signs of damage, such as a swollen or bulging top, cracks, or leaking oil.
  • Capacitance measures outside the specified tolerance range when tested with a multimeter.

Installation Tips

  • Disconnect all electrical power to the equipment before servicing.
  • Safely discharge the existing capacitor by shorting the terminals with a properly insulated tool.
  • Confirm that the capacitance (MFD/µF) and voltage ratings are appropriate for your application.
  • Ensure terminals are connected securely. Polarity is not a factor for this type of AC capacitor.
Product image
Product image
Product image
Product image
  • 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

Yes. This capacitor is rated for both 370 VAC and 440 VAC. It is perfectly safe to use this part in a system requiring either voltage rating, as it is designed to handle the higher threshold.
A failing capacitor often causes the AC unit or fan motor to hum without starting, or it may start slowly and struggle to reach full speed. If your outdoor condenser fan motor is not spinning but you hear a humming sound, or if your AC is blowing warm air because the compressor isn't engaging, the capacitor is a primary component to inspect.
Check the label on your existing capacitor. You need to match the microfarad (µF or MFD) rating exactly. This unit is a 55 µF capacitor. While the voltage rating can be equal to or higher than your original part, the microfarad rating must be the same to ensure your motor runs at the correct torque and speed.
This is a single-value 55 µF run capacitor. It is designed for applications requiring a single capacitance value, such as standalone motor run or fan start circuits. It should not be used as a replacement for dual-run capacitors that have three terminals (labeled C, HERM, and FAN).
Installation typically takes 15 to 30 minutes. You will need a screwdriver to remove the access panel and a pair of insulated needle-nose pliers to disconnect and reconnect the spade terminals. Always ensure the power to the unit is completely shut off at the breaker before beginning, and use an insulated screwdriver to safely discharge the old capacitor before handling it.
Capacitors are essentially consumable components. They are sensitive to extreme heat and voltage fluctuations common in HVAC systems. Over time, the internal dielectric material degrades, leading to a loss of capacitance. Frequent cycling of the AC unit and exposure to high ambient temperatures in the condenser cabinet will accelerate this wear.