Carrier Brand 40+5 uF MFD 370/440 VAC Round Dual Run Capacitor Dual Run Circular Start Capacitor - For Air Conditioner, Heat Pump
BlueStars 40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump systems.
Infographic showing wide range applications for 40+5 uF dual run capacitor in HVAC and refrigeration systems.
Four-step installation guide for 40+5 uF 370/440 VAC dual run capacitor on air conditioner and heat pump units.
Infographic showing two 40+5 uF 370/440 VAC dual run capacitors and signs indicating when to replace an AC capacitor.
40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump systems.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor with technical dimensions and safety certification labels.
Technical specification chart for 40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump.
Diagram of 40+5 uF dual run capacitor showing C, HERM, and FAN terminal labels for air conditioner and heat pump repair.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor with aluminum case and metalized polypropylene film construction.
Educational infographic showing how to choose a 40+5 uF 370/440 VAC dual run capacitor for HVAC systems.
Technician installing a 40+5 uF 370/440 VAC round dual run capacitor in an air conditioner unit.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump maintenance.
Infographic showing wide range applications for 40+5 uF dual run capacitor in HVAC and refrigeration systems.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump systems.
Infographic showing wide range applications for 40+5 uF dual run capacitor in HVAC and refrigeration systems.
Four-step installation guide for 40+5 uF 370/440 VAC dual run capacitor on air conditioner and heat pump units.
Infographic showing two 40+5 uF 370/440 VAC dual run capacitors and signs indicating when to replace an AC capacitor.
40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump systems.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor with technical dimensions and safety certification labels.
Technical specification chart for 40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump.
Diagram of 40+5 uF dual run capacitor showing C, HERM, and FAN terminal labels for air conditioner and heat pump repair.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor with aluminum case and metalized polypropylene film construction.
Educational infographic showing how to choose a 40+5 uF 370/440 VAC dual run capacitor for HVAC systems.
Technician installing a 40+5 uF 370/440 VAC round dual run capacitor in an air conditioner unit.
BlueStars 40+5 uF 370/440 VAC round dual run capacitor for air conditioner and heat pump maintenance.
Infographic showing wide range applications for 40+5 uF dual run capacitor in HVAC and refrigeration systems.
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40+5 uF MFD 370/440 VAC Round Dual Run Capacitor Dual Run Circular Start Capacitor - For Air Conditioner, Heat Pump

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40+5 MFD uF 370 or 440 Volt VAC Round Dual Run Capacitor

Key Features

  • Capacitance: 40 + 5 Microfarad (MFD)
  • Voltage Rating: 370V or 440V AC
  • Tolerance: +/- 5%
  • Frequency: 50 / 60 Hz
  • Operating Temperature: -40°C to +70°C (-40°F to +158°F)
  • Construction: Round aluminum case
  • Terminals: 3-terminal configuration (C, HERM, FAN)
  • Safety Standard: 10,000 AFC fault current protection

Replaces / Cross-Reference Part Numbers

  • USA2235
  • TRCFD405
  • P291-4054RS
  • C3405R
  • C4405R
  • 27L880
  • PRCFD405
  • HC98JA041

Compatibility & Fitment

  • Universal replacement for round dual run capacitors with matching 40/5 MFD capacitance and 370V or 440V ratings.
  • A 440V capacitor can replace a 370V capacitor; do not replace a 440V capacitor with a 370V unit.
  • Used in air conditioner condensers, heat pumps, and other HVAC systems.
  • Physical dimensions are approximately 2.0 - 2.4 inches in diameter and 3.7 - 5.25 inches in height. Verify fitment before purchase.

When to Replace

  • Outdoor unit fan does not spin.
  • Compressor hums but will not start.
  • HVAC system is running but not cooling.
  • Visible signs of failure, such as a bulging or leaking capacitor case.
  • Capacitance measures outside the specified tolerance when tested with a multimeter.

Installation Tips

  • Disconnect all electrical power to the HVAC unit before servicing.
  • Discharge the existing capacitor by shorting across the terminals with an insulated-handle screwdriver.
  • Photograph or note the wire placement on the C, HERM, and FAN terminals before disconnecting.
  • Connect the wires to the corresponding terminals on the new capacitor.
  • Secure the new capacitor with the original mounting bracket to prevent 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

A failing capacitor often shows physical signs like a bulging or domed top, leaking oil, or a burnt smell. Functionally, you may notice your air conditioner or heat pump struggling to start, a humming sound from the motor without it spinning, or the unit blowing warm air because the compressor is not engaging.
The 40+5 uF rating indicates the capacitance: 40 microfarads for the compressor motor and 5 microfarads for the fan motor. The 370/440 VAC rating means this capacitor is designed to operate safely at either 370 or 440 volts, making it a versatile replacement for systems requiring either voltage specification.
Yes, as long as the microfarad (uF) ratings match your original part, you can use a 440V capacitor to replace a 370V capacitor. A higher voltage rating is safe and will not damage your system, whereas the capacitance (uF) must be an exact match to ensure your motors start and run correctly.
You will need a screwdriver to remove the access panel, a pair of insulated needle-nose pliers for the terminals, and a pair of insulated pliers or a screwdriver with an insulated handle to safely discharge the old capacitor before handling it. The installation typically takes 15 to 30 minutes.
Capacitors are sensitive to heat and age. Over time, the internal dielectric material degrades. Frequent power surges, extreme outdoor temperatures, and restricted airflow around the condenser unit can accelerate this process, leading to premature failure.
Always turn off the power to the HVAC unit at the disconnect box or circuit breaker before opening the panel. Even when powered off, a capacitor can hold a dangerous electrical charge; always discharge the old capacitor by touching the terminals with an insulated tool before disconnecting the wires.