[Lifetime Warranty] 45+5 uF MFD 370/440 VAC Round Dual Circular Run Capacitor CBB65 50/60 Hz - Fits AC Motor Run, Fan Start, Condenser - Pack of 2
Two BlueStars 45+5 uF 370/440 VAC round dual run capacitors for AC motor and condenser fan applications.
BlueStars 45+5 uF 370/440 VAC round dual run capacitor with technical specifications and dimensions diagram.
Infographic showing technical specifications for a 45+5 uF round dual run capacitor with aluminum case.
Top view of 45+5 uF dual run capacitor showing C, HERM, and FAN terminal labels for AC motor and condenser wiring.
BlueStars 45+5 uF 370/440 VAC round dual run capacitor with aluminum case and metalized film construction details.
BlueStars 45+5 uF 370/440 VAC round dual run capacitor informational guide and product specifications.
Technician installing a 45+5 uF 370/440 VAC round dual run capacitor in an AC condenser unit.
Technician installing a 45+5 uF 370/440 VAC round dual run capacitor in an AC condenser unit.
Infographic showing wide range applications for 45+5 uF dual run capacitor in AC, refrigerators, heat pumps, and compressors.
Two BlueStars 45+5 uF 370/440 VAC round dual run capacitors for AC motor and condenser fan applications.
BlueStars 45+5 uF 370/440 VAC round dual run capacitor with technical specifications and dimensions diagram.
Infographic showing technical specifications for a 45+5 uF round dual run capacitor with aluminum case.
Top view of 45+5 uF dual run capacitor showing C, HERM, and FAN terminal labels for AC motor and condenser wiring.
BlueStars 45+5 uF 370/440 VAC round dual run capacitor with aluminum case and metalized film construction details.
BlueStars 45+5 uF 370/440 VAC round dual run capacitor informational guide and product specifications.
Technician installing a 45+5 uF 370/440 VAC round dual run capacitor in an AC condenser unit.
Technician installing a 45+5 uF 370/440 VAC round dual run capacitor in an AC condenser unit.
Infographic showing wide range applications for 45+5 uF dual run capacitor in AC, refrigerators, heat pumps, and compressors.
Lifetime Warranty

[Lifetime Warranty] 45+5 uF MFD 370/440 VAC Round Dual Circular Run Capacitor CBB65 50/60 Hz - Fits AC Motor Run, Fan Start, Condenser - Pack of 2

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CBB65 45+5 uF/MFD 45/5 uF 370 or 440 VAC Round Dual Run Capacitor - Pack of 2

Key Features

  • Package Contents: 2 capacitors
  • Model: CBB65
  • Capacitance: 45 + 5 microfarads (uF/MFD)
  • Capacitance Tolerance: ±6%
  • Voltage Rating: 370 or 440 Volts AC (VAC)
  • Frequency: 50/60 Hz
  • Operating Temperature: -40°C to 70°C (-40°F to 158°F)
  • Shape: Round
  • Terminals: 3 terminals labeled C (Common), FAN (Fan Motor), and HERM (Compressor Motor)
  • Physical Dimensions: 2.36 in. diameter x 3.15 in. height (60 mm x 80 mm)
  • Safety Standard: S1

Replaces / Cross-Reference Part Numbers

This capacitor replaces any round dual run capacitor with matching specifications. Verify the following on your original part:

  • Capacitance: 45/5 uF, 45+5 MFD
  • Voltage: 370V or 440V (a 440V rated capacitor can replace a 370V unit)
  • Shape: Round
  • Physical dimensions for proper mounting

Compatibility & Fitment

  • Application: Dual run capacitors combine two capacitors into one unit to start and run a compressor motor and a fan motor simultaneously.
  • Designed for use in HVAC systems, including air conditioner (AC) condensing units, heat pumps, air handlers, and furnace motors.
  • Compatible with units from major brands that require a capacitor with matching electrical specifications.

When to Replace

A failing capacitor can cause motor damage. Consider replacement if you observe the following symptoms:

  • The outdoor unit hums but the fan does not spin.
  • The compressor does not start.
  • The AC unit does not blow cold air.
  • The capacitor casing is visibly swollen, bulging, or leaking oil.
  • The system starts slowly or requires multiple attempts to start.

Installation Tips

  • Disconnect all electrical power to the HVAC unit at the breaker box and service panel before beginning work.
  • Safely discharge the old capacitor by shorting the terminals with an insulated screwdriver.
  • Note the wire placement on the C, FAN, and HERM terminals before disconnecting the old unit.
  • Connect the wires to the corresponding terminals on the new capacitor.
  • Ensure the new capacitor is secured with the original mounting bracket.
  • Consult a qualified technician if you are not comfortable performing this repair.
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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
Capacitance
‎45 µF + 5 µF (dual)
Voltage Rating
‎370 VAC or 440 VAC dual
Certification
‎UL & cUL, CE, TUV SÜD compliance
Replacement For
‎97F9895, Z97F995, 97F9895BZ3, 27L880, TRCD455, TRCFD455, PRCFD455, 27L889, 97F9851, 97F9851S, 12788, RC0114, Z97F9895, 97F9895, TT-CAP-45/5/440R, HC98KA046, TP-CAP-45/5/440R, CAP050450440RT, HC98JA046, HCKS450D050R440Z, 00662441180262
Dimensions
‎2.36" (6cm) x Height 4.73" (12cm)
Temp Range
‎–25 °C to +70 °C (–13 °F to +158 °F)
SCCR
‎10,000 A fault current rating
Terminals
‎Herm (compressor), Fan (fan), Common
Material
‎Aluminum Case

FAQ

This type of round dual run capacitor is commonly used in residential and light commercial air-conditioning and heat pump outdoor condenser units. The 45+5 uF rating means it supports two circuits in one capacitor: typically 45 uF for the compressor side and 5 uF for the condenser fan motor. It should only be used as a replacement when your original capacitor matches the same microfarad rating and has a compatible voltage rating and terminal layout.
In many cases, yes. A 370/440 VAC capacitor is generally used as a replacement for a 370 VAC capacitor if the microfarad rating is exactly the same, such as 45+5 uF. The replacement voltage rating can be equal to or higher than the original, but the capacitance rating should match the equipment requirement.
45+5 uF identifies the two capacitance values inside the dual run capacitor: one section rated at 45 microfarads and the other at 5 microfarads. CBB65 is a common capacitor series/type marking used on metal-can motor run capacitors for HVAC equipment. 50/60 Hz indicates it is intended for standard AC power frequencies.
Common signs include the outdoor AC unit humming but not starting, the condenser fan not spinning, the compressor struggling to start, intermittent cooling, breaker trips during startup, or visible swelling/leaking from the capacitor can. A weak capacitor may also let the fan run slowly or cause the system to shut off on thermal overload.
Check the label on your existing capacitor for three things: the capacitance rating, the voltage rating, and the style. For this part, the key match is 45+5 uF on a round dual run capacitor. Your replacement should also have a voltage rating of 370 VAC or 440 VAC as required by your system, and the terminal arrangement should match your wiring setup, usually marked C, FAN, and HERM.
Most dual run capacitors use three terminal groups labeled C, FAN, and HERM. C is common, FAN connects to the condenser fan motor circuit, and HERM connects to the compressor circuit. Always move wires one at a time from the old capacitor to the new one or take a clear photo before removal, because miswiring can prevent the system from running correctly.
Installation is usually a moderate repair for someone comfortable working around HVAC electrical components. Typical tools include a screwdriver or nut driver to open the service panel, insulated needle-nose pliers for terminals, and ideally a multimeter with capacitance testing. The job often takes about 15 to 30 minutes, but power must be fully disconnected and the old capacitor safely discharged before handling.
Repeated capacitor failure can point to an underlying problem such as high operating temperatures, voltage imbalance, a weak condenser fan motor, a hard-starting compressor, poor airflow through the condenser coil, loose electrical connections, or an aging contactor. If a replacement capacitor does not restore normal operation or fails again soon, the rest of the outdoor unit should be inspected rather than replacing capacitors repeatedly.