Emerson Brand 540-648 uF MFD 110-125 VAC ±20% CD60 Round Start Capacitor - Fits OEM Single Phase Motor, Heat Pump
BlueStars 540-648 uF 110-125 VAC CD60 round start capacitor for single phase motors and heat pumps.
Four-step installation guide for 540-648 uF 110-125 VAC motor start capacitor.
Infographic showing when to replace a 540-648 uF 110-125 VAC CD60 round start capacitor for single phase motors.
BlueStars 540-648 uF 110-125 VAC round start capacitor for heat pump motors shown in a lifestyle home setting.
BlueStars 540-648 uF 110-125 VAC round start capacitor with dimensions labeled on a technical specification graphic.
Specification chart for BlueStars 540-648 uF 110-125 VAC round start capacitor for motors and heat pumps.
BlueStars 540-648 uF 110-125 VAC round motor start capacitor with 2-pin terminal design.
Infographic showing 540-648 uF 110-125 VAC CD60 round start capacitor features and construction materials.
Educational infographic showing how to select a 540-648 uF 110-125 VAC CD60 round start capacitor for motor replacement.
Technician installing a 540-648 uF 110-125 VAC round start capacitor into a single phase motor.
BlueStars 540-648 uF 110-125 VAC round start capacitor shown with a cutaway view of a single phase motor.
Infographic showing wide application of 540-648 uF start capacitor for electric motors, pumps, and heat pump equipment.
BlueStars 540-648 uF 110-125 VAC CD60 round start capacitor for single phase motors and heat pumps.
Four-step installation guide for 540-648 uF 110-125 VAC motor start capacitor.
Infographic showing when to replace a 540-648 uF 110-125 VAC CD60 round start capacitor for single phase motors.
BlueStars 540-648 uF 110-125 VAC round start capacitor for heat pump motors shown in a lifestyle home setting.
BlueStars 540-648 uF 110-125 VAC round start capacitor with dimensions labeled on a technical specification graphic.
Specification chart for BlueStars 540-648 uF 110-125 VAC round start capacitor for motors and heat pumps.
BlueStars 540-648 uF 110-125 VAC round motor start capacitor with 2-pin terminal design.
Infographic showing 540-648 uF 110-125 VAC CD60 round start capacitor features and construction materials.
Educational infographic showing how to select a 540-648 uF 110-125 VAC CD60 round start capacitor for motor replacement.
Technician installing a 540-648 uF 110-125 VAC round start capacitor into a single phase motor.
BlueStars 540-648 uF 110-125 VAC round start capacitor shown with a cutaway view of a single phase motor.
Infographic showing wide application of 540-648 uF start capacitor for electric motors, pumps, and heat pump equipment.
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540-648 uF MFD 110-125 VAC ±20% CD60 Round Start Capacitor - Fits OEM Single Phase Motor, Heat Pump

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540-648 uF/MFD 110-125 VAC Round Start Capacitor

Key Features

  • Capacitance: 540-648 microfarads (uF/MFD)
  • Voltage Rating: 110-125 Volts AC
  • Frequency: 50/60 Hz
  • Dimensions: 1 13/16 in. Diameter x 4 3/8 in. Height
  • Terminals: 1/4 inch male quick-connect
  • Construction: Non-polarized aluminum electrolytic
  • Case: Hermetically sealed bakelite case resists oil, dirt, and moisture
  • Duty Cycle: Intermittent, for motor starting applications

Replaces / Cross-Reference Part Numbers

  • Packard PMJ540A
  • BMI 091A540B125CE7A
  • UPC 840899105864

Compatibility & Fitment

  • Application: Designed for starting single-phase AC motors
  • Common Usage: Air conditioners, refrigeration units, compressors, furnace fan motors, and other motor-driven equipment
  • Fits applications requiring a 540-648 MFD capacitor rated for 110V, 115V, or 125V systems

When to Replace

  • Motor hums but does not start
  • Slow or difficult motor startup
  • Circuit breaker trips when the motor attempts to start
  • Existing capacitor shows physical damage like bulging, cracking, or leaking fluid
  • Capacitance measures outside the rated tolerance when tested with a multimeter

Installation Tips

  • Disconnect all electrical power to the unit before servicing.
  • Safely discharge the old capacitor using a suitable resistor across the terminals.
  • Ensure the microfarad (uF/MFD) rating matches the original capacitor's specification.
  • The new capacitor's voltage rating must be equal to or higher than the original.
  • As a non-polarized capacitor, wires can be connected to either terminal.
  • Secure the capacitor in its mounting bracket to prevent vibration.
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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

If your motor hums but fails to reach full speed, trips the circuit breaker upon startup, or refuses to start entirely, the capacitor is likely failing. You may also notice the capacitor casing is bulging, leaking, or showing signs of heat damage.
Yes, this CD60 capacitor is designed for any single-phase AC motor application requiring a 540-648 uF rating at 110-125 VAC. It is commonly used in air compressors, pressure washers, HVAC systems, generators, washing machines, and refrigeration units operating at 50/60 Hz.
Always verify that your equipment's power is disconnected and that the old capacitor has been safely discharged using a resistor or an insulated screwdriver across the terminals. Inspect the wiring connections for corrosion or loose fitment, and ensure the new capacitor’s voltage and microfarad (uF) ratings match your motor's original specifications exactly.
Replacing a start capacitor is a straightforward task that typically takes 10 to 20 minutes. You will generally only need a screwdriver to open the access panel and a pair of needle-nose pliers to remove and reattach the spade connectors. Ensure the new unit is securely mounted in the same orientation as the original.
Start capacitors are designed for intermittent use to provide the initial torque required to get a motor spinning. Failure is most often caused by excessive heat, frequent rapid cycling of the motor, or simple age-related degradation of the internal dielectric material.