Marathon Brand 124-149 uF MFD 165 VAC Round Run Start Capacitor - 2 Pack
Two 124-149 uF 165 VAC round start capacitors with BlueStars branding and terminal connectors.
BlueStars 124-149 uF 165 VAC round start capacitor with technical specifications infographic.
BlueStars 124-149 uF 165 VAC round start capacitor showing dimensions of 3.18 inches height and 1.8 inches diameter.
Air conditioner unit showing symptoms of a faulty start capacitor like hard starting or unusual noise.
Close-up of a single 124-149 uF 165 VAC round start capacitor with phenolic resin case and product label.
124-149 uF 165 VAC round start capacitor with 1/4 inch terminals and close-up view of connector pins.
Woman relaxing on a couch under an air conditioner with BlueStars Economical DIY Repair text overlay.
Two 124-149 uF 165 VAC round start capacitors with BlueStars branding and terminal connectors.
BlueStars 124-149 uF 165 VAC round start capacitor with technical specifications infographic.
BlueStars 124-149 uF 165 VAC round start capacitor showing dimensions of 3.18 inches height and 1.8 inches diameter.
Air conditioner unit showing symptoms of a faulty start capacitor like hard starting or unusual noise.
Close-up of a single 124-149 uF 165 VAC round start capacitor with phenolic resin case and product label.
124-149 uF 165 VAC round start capacitor with 1/4 inch terminals and close-up view of connector pins.
Woman relaxing on a couch under an air conditioner with BlueStars Economical DIY Repair text overlay.
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124-149 uF MFD 165 VAC Round Run Start Capacitor - 2 Pack

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124-149 uF/MFD 165VAC Round Run Start Capacitor

Key Features

  • Capacitance: 124-149 Microfarad (µF/MFD)
  • Voltage Rating: 165 VAC
  • Frequency: 50/60 Hz
  • Operating Temperature: -40°C to 65°C (-40°F to 149°F)
  • Tolerance: -0% / +20%
  • Terminals: 1/4 inch quick disconnect
  • Case: Round, moisture and oil-resistant plastic
  • Dielectric Fluid: PCB-free
  • Certifications: UL 810 Recognized

Replaces / Cross-Reference Part Numbers

  • Direct replacement for any capacitor with matching capacitance (124-149 µF) and voltage (165VAC or higher) ratings.
  • Commonly used to replace parts from brands such as Mars, TEMCo, and Seentech.
  • Compatible with generic model type CD60.
  • Replaces part number TEMCo SC0092.

Compatibility & Fitment

  • Designed for intermittent duty motor starting applications.
  • Suitable for single-phase and three-phase AC electric motors.
  • Commonly used in HVAC systems, air conditioners, compressors, refrigeration units, and other motor-driven equipment.

When to Replace

  • Motor hums but fails to start.
  • Motor starts slowly or requires assistance.
  • A clicking sound is heard with no motor activity.
  • The capacitor case is visibly bulged, cracked, or leaking fluid.
  • Capacitance measures outside the specified 124-149 µF range when tested with a multimeter.

Installation Tips

  • Disconnect all electrical power to the unit before beginning installation.
  • Safely discharge the existing capacitor by shorting the terminals with an insulated tool.
  • Confirm the new capacitor's µF rating matches the original component's specifications. The voltage rating must be equal to or greater than the original.
  • Ensure firm connections to the quick disconnect terminals.
  • Mount the capacitor securely to prevent movement and vibration during operation.

FAQ

This 124-149 uF 165 VAC start capacitor is designed for use in fractional horsepower, single-phase electric motors. It is commonly utilized in HVAC systems, air compressors, water pumps, and various gear motor applications.
This unit is a direct replacement for several industry-standard part numbers, including PSMJ124, MARS 11031, JARD 11931, and CD60.
This capacitor measures approximately 3 3/8 inches in height and 1 7/16 inches in diameter. It features a rugged plastic housing that does not require additional insulation.
A failing start capacitor is often the culprit when a motor hums but fails to reach operating speed, or if the motor trips its thermal overload protector shortly after attempting to start. If you notice the motor struggling to turn over or failing to start entirely, testing the capacitor with a multimeter is the recommended next step.
Yes. Capacitors store an electrical charge even when the power is disconnected. Before handling the terminals, you must safely discharge the capacitor using an insulated screwdriver to bridge the terminals. Always ensure the power supply to the equipment is completely shut off and verified with a voltage tester before beginning any work.
The uF (microfarad) or MFD rating indicates the electrical capacitance of the unit. This specific capacitor is designed to operate within the 124-149 uF range. It is critical to replace your old capacitor with one that matches this range, as using an incorrect capacitance can prevent the motor from starting or cause damage to the motor windings.