340-408 uF MFD 110-125 VAC ±20% Round Start Capacitor 50/60 Hz - Fits Single-Phase Motors, Gear Motors
BlueStars 340-408 uF 110-125 VAC round start capacitor for single-phase motors with dual terminal connectors.
Four-step installation guide for 340-408 uF 110-125 VAC round start capacitor on a single-phase motor.
BlueStars 340-408 uF 110-125 VAC round start capacitor with informational graphic on replacement signs.
BlueStars 340-408 uF 110-125 VAC round start capacitor for single-phase motors shown in a lifestyle advertisement.
340-408 uF 110-125 VAC round start capacitor with dimensions labeled for single-phase motor compatibility.
Specification chart for 340-408 uF 110-125 VAC round start capacitor with technical details and product image.
BlueStars 340-408 uF 110-125 VAC 2-pin round motor start capacitor with label details.
BlueStars 340-408 uF 110-125 VAC round start capacitor with phenolic resin casing and metalized film construction.
Educational infographic showing a 340-408 uF 110-125 VAC round start capacitor and how to select the right replacement.
BlueStars 340-408 uF 110-125 VAC round start capacitor being installed into a single-phase motor.
340-408 uF 110-125 VAC round start capacitor for single-phase motors shown next to a cutaway view of a water pump.
Infographic showing wide applications for 340-408 uF start capacitor in electric motors, pumps, and carpentry equipment.
BlueStars 340-408 uF 110-125 VAC round start capacitor for single-phase motors with dual terminal connectors.
Four-step installation guide for 340-408 uF 110-125 VAC round start capacitor on a single-phase motor.
BlueStars 340-408 uF 110-125 VAC round start capacitor with informational graphic on replacement signs.
BlueStars 340-408 uF 110-125 VAC round start capacitor for single-phase motors shown in a lifestyle advertisement.
340-408 uF 110-125 VAC round start capacitor with dimensions labeled for single-phase motor compatibility.
Specification chart for 340-408 uF 110-125 VAC round start capacitor with technical details and product image.
BlueStars 340-408 uF 110-125 VAC 2-pin round motor start capacitor with label details.
BlueStars 340-408 uF 110-125 VAC round start capacitor with phenolic resin casing and metalized film construction.
Educational infographic showing a 340-408 uF 110-125 VAC round start capacitor and how to select the right replacement.
BlueStars 340-408 uF 110-125 VAC round start capacitor being installed into a single-phase motor.
340-408 uF 110-125 VAC round start capacitor for single-phase motors shown next to a cutaway view of a water pump.
Infographic showing wide applications for 340-408 uF start capacitor in electric motors, pumps, and carpentry equipment.
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340-408 uF MFD 110-125 VAC ±20% Round Start Capacitor 50/60 Hz - Fits Single-Phase Motors, Gear Motors

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340-408 uF MFD 110-125VAC ±20% Round Start Capacitor 50/60Hz

Key Features

  • Capacitance: 340-408 µF (MFD)
  • Rated Voltage: 110-125 VAC
  • Frequency: 50/60 Hz
  • Tolerance: ±20%
  • Operating Temperature Range: -40°C to +65°C (-40°F to +149°F)
  • Shape: Round
  • Case Material: Moisture and oil-resistant plastic
  • Terminal Type: 1/4 inch male quick-connect

Replaces / Cross-Reference Part Numbers

  • Universal replacement for start capacitors with matching specifications.
  • Compatible replacement for any brand capacitor rated at 340-408 µF and 110-125 VAC.
  • Interchangeable with CD60 type start capacitors.

Compatibility & Fitment

  • Designed for the starting circuit of single-phase AC electric motors.
  • Commonly used in applications such as:
    • Air conditioners
    • Air compressors
    • Pool and well pumps
    • HVAC units
    • Other motor-driven equipment

When to Replace

  • Motor hums but fails to start or starts slowly.
  • Circuit breaker trips upon motor startup.
  • Visible signs of damage, such as a bulging case, cracks, or fluid leakage.
  • Capacitance measures outside the specified tolerance range when tested with a multimeter.

Installation Tips

  • Disconnect all electrical power to the unit before performing installation.
  • Safely discharge the existing capacitor by shorting the terminals with a resistor or an insulated tool.
  • Verify that the µF (MFD) and VAC ratings of the replacement capacitor match the original part.
  • AC start capacitors are non-polarized; wires can be connected to either terminal.
  • Ensure all electrical connections are secure.
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  • Perfect fit

    Perfect fit

    Universal fit with any brands with the same ratings
  • Premium quality

    Premium quality

    This product adopts a high-quality metalized polypropylene film that provides stable and durable performance
  • Saving solution

    Saving solution

    Enjoy the great feeling when your engine is repaired and works properly like before - BlueStars brings DIY solutions to help you deal with any trouble
  • Simple installation

    Simple installation

    Because the capacitor is a relatively simple part, the installation just takes a few minutes and will save you at least a hundred bucks in labor

FAQ

This capacitor replaces or supersedes numerous industry-standard parts, including 092A340B125AD2A, 4X067, 11022, 11922, 1022, PMJ340, PMJ340A, BC-340, PSU34015, 235-9739-02, MSC125V340, and CS340-408x110.
A failing start capacitor often prevents a single-phase motor from reaching its operating speed. You may notice the motor humming or buzzing without turning, or it may struggle to start and trip the thermal overload. If the capacitor casing is bulging, leaking, or shows signs of burn marks, it should be replaced immediately.
Yes, this is a standard round start capacitor designed for use in HVAC systems, compressors, pumps, gear motors, and various other single-phase motor applications requiring a 340-408 uF rating at 110-125 VAC.
Installation is generally straightforward for those familiar with electrical safety. You will need a screwdriver to remove the housing and a pair of needle-nose pliers to disconnect the terminals. Always ensure the power is disconnected and the old capacitor is safely discharged before touching the terminals to avoid electrical shock.
The uF (microfarad) rating indicates the amount of electrical energy the capacitor can store. This specific unit is designed for motors requiring a range between 340 and 408 uF. It is critical to match this rating to your motor's specifications, as using an incorrect value can prevent the motor from starting or cause damage to the motor windings.
Before installation, inspect the wiring connections for any corrosion or loose terminals. If the terminals are corroded, clean them to ensure a solid electrical connection. Additionally, verify that the voltage and uF ratings on your old capacitor match the requirements of your motor, as installing the wrong size can lead to premature motor failure.