70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump
BlueStars 70+5 uF 370/440 VAC CBB65 dual run circular start capacitor for AC motors and heat pumps.
Infographic showing wide range applications for 70+5 uF dual run capacitor in AC, refrigerator, heat pump, and compressor.
Four-step infographic showing easy installation instructions for a 70+5 uF dual run circular start capacitor.
Infographic showing two 70+5 uF CBB65 dual run capacitors and signs indicating when to replace an AC unit capacitor.
70+5 uF CBB65 dual run capacitor for AC and heat pump systems shown in a lifestyle marketing graphic.
70+5 uF MFD 370/440 VAC CBB65 dual run circular capacitor with 5.12-inch height and 2.36-inch diameter dimensions.
Specification chart for 70+5 uF 370/440 VAC CBB65 dual run circular start capacitor with technical details.
Top view of 70+5 MFD dual run capacitor showing C, HERM, and FAN terminal labels for AC motor and heat pump wiring.
BlueStars 70+5 uF dual run circular capacitor with aluminum case and metalized polypropylene film construction.
Informational guide on choosing a 70+5 uF 370/440 VAC dual run circular capacitor for AC and heat pump motors.
BlueStars 70+5 uF 370/440 VAC CBB65 dual run circular capacitor shown in a lifestyle graphic with an HVAC technician.
Technician installing a 70+5 uF CBB65 dual run capacitor in an AC unit with product specifications displayed.
Infographic showing wide range applications for 70+5 uF dual run capacitor in AC, refrigerator, heat pump, and compressor.
BlueStars 70+5 uF 370/440 VAC CBB65 dual run circular start capacitor for AC motors and heat pumps.
Infographic showing wide range applications for 70+5 uF dual run capacitor in AC, refrigerator, heat pump, and compressor.
Four-step infographic showing easy installation instructions for a 70+5 uF dual run circular start capacitor.
Infographic showing two 70+5 uF CBB65 dual run capacitors and signs indicating when to replace an AC unit capacitor.
70+5 uF CBB65 dual run capacitor for AC and heat pump systems shown in a lifestyle marketing graphic.
70+5 uF MFD 370/440 VAC CBB65 dual run circular capacitor with 5.12-inch height and 2.36-inch diameter dimensions.
Specification chart for 70+5 uF 370/440 VAC CBB65 dual run circular start capacitor with technical details.
Top view of 70+5 MFD dual run capacitor showing C, HERM, and FAN terminal labels for AC motor and heat pump wiring.
BlueStars 70+5 uF dual run circular capacitor with aluminum case and metalized polypropylene film construction.
Informational guide on choosing a 70+5 uF 370/440 VAC dual run circular capacitor for AC and heat pump motors.
BlueStars 70+5 uF 370/440 VAC CBB65 dual run circular capacitor shown in a lifestyle graphic with an HVAC technician.
Technician installing a 70+5 uF CBB65 dual run capacitor in an AC unit with product specifications displayed.
Infographic showing wide range applications for 70+5 uF dual run capacitor in AC, refrigerator, heat pump, and compressor.

70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump

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70+5 uF ±5% 70/5 MFD 370/440 VAC Dual Run Start Round Capacitor

Key Features

  • Capacitance Rating: 70 + 5 Microfarad (MFD/uF)
  • Capacitance Tolerance: ±5%
  • Voltage Rating: 370 / 440 Volts AC (VAC)
  • Frequency: 50 / 60 Hertz (Hz)
  • Configuration: Dual run capacitor in a single round case
  • Terminals: Three terminals labeled for Common, Fan, and Compressor connections
  • Construction: Aluminum case, oil-filled, non-PCB dielectric
  • Safety: Integrated 10,000 AFC pressure-sensitive interrupter
  • Operating Temperature: -40 °C to +70 °C (-104 °F to +158 °F)
  • Standard: Tested to EIA-456-A specifications

Replaces / Cross-Reference Part Numbers

  • Replaces any round or oval dual run capacitor with matching 70/5 MFD and 370V or 440V specifications. A 440V capacitor can be used to replace a 370V capacitor.
  • Common part number formats include: CBB65, P291-7054R, USA2236, C3705R, C4705R, TRCD705, and CAP05070.
  • Compatible replacement for capacitors from brands such as Genteq, Packard, Titan, and TEMCo.

Compatibility & Fitment

  • Used in air conditioning units, heat pumps, condensing units, and other HVAC systems to run a compressor motor and a fan motor simultaneously.
  • Physical dimensions must be verified for fitment in the existing mounting bracket.
    • Diameter: Approx. 2.36 in (60 mm)
    • Case Height: Approx. 5.4 in (137 mm)
  • The dual voltage rating allows for use in both 370 VAC and 440 VAC applications.

When to Replace

  • Compressor or fan motor hums but fails to start.
  • AC unit requires a manual "push start" to get the fan spinning.
  • Air conditioner blows warm air.
  • Visible damage to the capacitor, such as a bulging top, swelling, or fluid leakage.
  • Capacitance measurement is outside the rated ¬±5% tolerance when tested with a multimeter.

Installation Tips

  • WARNING: Disconnect all electrical power to the HVAC unit before handling or replacing the capacitor.
  • Safely discharge the existing capacitor by carefully shorting across the terminals with an insulated screwdriver.
  • Before disconnecting, note the wire colors and their corresponding terminals ("C", "HERM", "FAN").
  • Connect the run wire from the compressor to the "HERM" terminal.
  • Connect the run wire from the fan motor to the "FAN" terminal.
  • Connect the common wire from the contactor to the "C" terminal.
  • Ensure all connections are secure before restoring power.
70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 1
70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 2
70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 3
70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 4
  • 70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 1

    Step 1

    Turn off the power and locate the capacitor
  • 70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 2

    Step 2

    Discharge any stored electricity by shorting the terminals
  • 70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 3

    Step 3

    Take a photo or note how the wires connect. Disconnect wires & install the new capacitor.
  • 70+5 uF MFD ±5% 370/440 VAC CBB65 Dual Run Circular Start Capacitor - Fits AC Motor Run, Fan Start, Heat Pump 4

    Step 4

    Reassemble and test

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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FAQs

This is a dual-run capacitor, meaning it serves two functions in one unit. The 70 uF (microfarad) side provides the necessary power to start and run your compressor, while the 5 uF side is dedicated to the fan motor. It is critical to match these ratings exactly to your existing capacitor to ensure your motor and compressor receive the correct electrical load.
Yes. A 440 VAC capacitor is a direct, universal replacement for 370 VAC units. The voltage rating indicates the maximum voltage the capacitor can handle; therefore, a 440 VAC unit is more robust and perfectly safe to use in a 370 VAC application.
Common signs include the AC unit humming but failing to start, the fan motor struggling to spin or requiring a manual push to start, or the system blowing warm air because the compressor is not engaging. If you notice the top of the capacitor is domed or bulging, it has failed and requires immediate replacement.
Replacing a capacitor is a straightforward task, typically taking 15–30 minutes. You will need a screwdriver to open the service panel and a pair of needle-nose pliers to disconnect the spade terminals. Always ensure the power to the HVAC unit is completely disconnected at the breaker before beginning, and use an insulated screwdriver to safely discharge any residual energy from the old capacitor terminals before touching them.
Before installation, visually inspect the wiring for any signs of heat damage, such as melted or scorched insulation on the spade connectors. If the connectors are loose or corroded, they should be cleaned or replaced to ensure a tight, low-resistance connection. Additionally, verify that the physical dimensions of the new capacitor will fit within your unit's mounting bracket, as sizes can vary slightly between manufacturers.
Capacitors are sensitive to heat and electrical surges. Frequent power cycling, extreme summer temperatures, and poor ventilation around the outdoor condenser unit can accelerate internal degradation. Keeping your condenser coils clean and free of debris helps the system run more efficiently, which reduces the thermal stress on the capacitor.