340-408 uF MFD 110-125 VAC ±20% Round Start Capacitor 50/60 Hz - Fits Single-Phase Motors, Gear Motors - 2 Pack
Two BlueStars 340-408 uF 110-125 VAC round start capacitors for single-phase motors.
BlueStars 340-408 uF 110-125 VAC round start capacitor with technical specifications infographic.
Two BlueStars 340-408 uF 110-125 VAC round start capacitors for single-phase motors.
BlueStars 340-408 uF 110-125 VAC round start capacitor with technical specifications infographic.
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340-408 uF MFD 110-125 VAC ±20% Round Start Capacitor 50/60 Hz - Fits Single-Phase Motors, Gear Motors - 2 Pack

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340-408 uF 110-125 VAC ±20% Volts Round Start Capacitor

Key Features

  • Capacitance: 340-408 MFD/uF
  • Voltage: 110-125 VAC
  • Frequency: 50/60 Hz
  • Tolerance: ±20%
  • Operating Temperature: -40°C to +65°C (-40°F to 149°F)
  • Shape: Round with a moisture and oil-resistant case
  • Terminals: Standard 1/4 inch dual blade quick-connect
  • Duty Cycle: Rated for up to 20 starts per hour at a 3-second duration
  • Quantity: Includes two capacitors

Replaces / Cross-Reference Part Numbers

  • Replaces any start capacitor with the same capacitance range and voltage rating.
  • Commonly replaces part numbers such as Packard PMJ340.
  • Interchangeable with capacitors from brands like BMI and TEMCo that meet equivalent electrical specifications.

Compatibility & Fitment

  • Designed for use in single-phase AC electric motors to provide starting torque.
  • Suitable for applications including HVAC units, air compressors, well pumps, refrigeration units, and various gear motors.
  • Features a standard round case and snap-in mounting type for broad compatibility.

When to Replace

  • Motor hums but fails to start or is slow to reach operating speed.
  • Circuit breaker trips during motor startup.
  • The existing capacitor shows physical damage, such as bulging, cracking, or leaking fluid.
  • A multimeter test indicates the capacitance is outside the specified tolerance range.

Installation Tips

  • Disconnect all electrical power to the motor before installation.
  • Safely discharge the existing capacitor by shorting the terminals with a suitable resistor or an insulated tool.
  • Confirm the new capacitor's uF/MFD range and voltage rating match the original part. The voltage rating can be equal to or higher than the original.
  • Note the wire positions before disconnecting. AC start capacitors are non-polarized.
  • Securely mount the new capacitor and firmly connect the wires to the terminals.

FAQ

A failed start capacitor typically prevents the motor from reaching its operating speed. You may notice the motor humming or buzzing when you attempt to start it, but it fails to turn, or it may start very slowly and struggle to gain momentum. In some cases, the motor may trip the circuit breaker or thermal overload protector immediately upon startup.
This capacitor is a direct replacement for various industry-standard parts, including 092A340B125AD2A, 092A340B125AC1A, 4X067, 11022, 11922, 1022, PMJ340, PMJ340A, BC-340, PSU34015, 235-9739-02, MSC125V340, and CS340-408x110.
Yes, this capacitor is designed for use with any single-phase motor that requires a 340-408 uF start capacitor rated for 110-125 VAC. It is commonly used in compressors, pumps, gear motors, and various industrial motor applications requiring a 50/60 Hz frequency.
Always ensure the power is disconnected from the equipment. Before handling the old capacitor, discharge it by placing an insulated screwdriver across the terminals to prevent electrical shock. Additionally, inspect the motor's centrifugal switch; if the switch is stuck or faulty, it can cause the new capacitor to fail prematurely.
Ensure that the microfarad (uF/MFD) rating matches your motor's requirements. While the voltage rating can be higher than the original, it should never be lower. This capacitor is rated for 340-408 uF and 110-125 VAC; using a capacitor with a significantly different uF rating can prevent the motor from starting or cause it to overheat during the startup phase.