Marathon Brand 6 uF MFD ±5% 370/440 VAC Oval Run Start Capacitor 50/60 Hz - Fits AC Motor Run, Fan Start, Heat Pump
6 uF 370/440 VAC oval run start capacitor for AC motors and heat pumps.
Infographic showing when to replace a 6 uF 370/440 VAC oval AC run start capacitor due to damage or performance issues.
6 uF 370/440 VAC oval run start capacitor for AC motors and heat pumps shown in a lifestyle advertisement.
BlueStars 6 uF 370/440 VAC oval run capacitor with dimensions and top view showing terminal layout.
Specification chart for 6 uF 370/440 VAC oval run capacitor with technical details and product image.
Top view of 6 uF oval run capacitor showing 2-terminal layout with C, F, and H terminal labels.
Educational infographic showing how to choose a 6 uF 370/440 VAC oval run start capacitor for AC motors and fans.
6 uF 370/440 VAC oval run capacitor for AC motors and heat pumps shown in a promotional lifestyle graphic.
Technician installing a 6 uF 370/440 VAC oval run start capacitor in an AC unit.
Infographic showing 6 uF run capacitor applications for air conditioners, refrigerators, heat pumps, and compressors.
Step-by-step installation guide for 6 uF 370/440 VAC oval run start capacitor for AC and heat pump motors.
6 uF 370/440 VAC oval run start capacitor for AC motors and heat pumps.
Infographic showing when to replace a 6 uF 370/440 VAC oval AC run start capacitor due to damage or performance issues.
6 uF 370/440 VAC oval run start capacitor for AC motors and heat pumps shown in a lifestyle advertisement.
BlueStars 6 uF 370/440 VAC oval run capacitor with dimensions and top view showing terminal layout.
Specification chart for 6 uF 370/440 VAC oval run capacitor with technical details and product image.
Top view of 6 uF oval run capacitor showing 2-terminal layout with C, F, and H terminal labels.
Educational infographic showing how to choose a 6 uF 370/440 VAC oval run start capacitor for AC motors and fans.
6 uF 370/440 VAC oval run capacitor for AC motors and heat pumps shown in a promotional lifestyle graphic.
Technician installing a 6 uF 370/440 VAC oval run start capacitor in an AC unit.
Infographic showing 6 uF run capacitor applications for air conditioners, refrigerators, heat pumps, and compressors.
Step-by-step installation guide for 6 uF 370/440 VAC oval run start capacitor for AC and heat pump motors.
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6 uF MFD ±5% 370/440 VAC Oval Run Start Capacitor 50/60 Hz - Fits AC Motor Run, Fan Start, Heat Pump

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6uF MFD ±5% 370-440VAC Oval Run Start Capacitor

Key Features

  • Capacitance: 6 microfarads (uF)
  • Tolerance: ±5%
  • Voltage Rating: 370/440 VAC, dual rated
  • Frequency: 50/60 Hz
  • Shape: Oval
  • Operating Temperature: -40° C to 70° C
  • Construction: Metallized polypropylene film
  • Dielectric: Non-PCB fluid-filled
  • Terminals: 1/4 inch male quick-connect
  • Standards: EIA-456 compliant, UL recognized, RoHS compliant

Replaces / Cross-Reference Part Numbers

  • Replaces any oval 6 MFD or 6 uF capacitor with a 370V or 440V rating.
  • AMRAD USA2030

Compatibility & Fitment

  • Designed for continuous duty in single-phase AC motor run applications.
  • Used in air conditioners, heat pumps, compressors, furnaces, and fan motors.
  • The physical dimensions must match the mounting bracket of the existing equipment.

When to Replace

  • Motor hums but does not start.
  • Motor starts or runs slowly.
  • Fan blades require a manual push to start spinning.
  • Visible signs of damage, such as a bulging top, cracks, or fluid leaks.
  • Capacitance measures outside the ±5% tolerance when tested with a multimeter.

Installation Tips

  • Disconnect all electrical power to the appliance before installation.
  • Safely discharge the old capacitor by shorting the terminals with a resistor or insulated screwdriver.
  • Ensure the new capacitor's uF (MFD) rating matches the original specification exactly.
  • Using a capacitor with an equal or higher VAC rating is acceptable. Do not use one with a lower VAC rating.
  • Note the wire placement on the old capacitor's terminals before disconnecting.
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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 causes the motor to hum without starting, or it may start slowly and struggle to reach full speed. If you notice your fan or motor is sluggish, or if the top of the capacitor appears domed or bulging, it is likely time for a replacement.
Yes, this capacitor is rated for both 370 VAC and 440 VAC. You can safely use this 440 VAC rated capacitor in place of an original 370 VAC part, provided the MFD (microfarad) rating matches your equipment requirements.
The 6 uF (microfarad) rating is the capacitance value. It is critical to match this number exactly to your motor's specifications. A variance of ±5% is acceptable, but using a capacitor with a significantly different MFD rating can cause the motor to overheat or fail to start.
Always disconnect the power supply to the unit before beginning. Because capacitors store an electrical charge even when the power is off, use an insulated screwdriver to short across the terminals to safely discharge any remaining energy before handling the unit.
Installation is generally straightforward and typically only requires a screwdriver to open the access panel and a pair of needle-nose pliers to remove and attach the spade connectors to the terminals. The process usually takes less than 15 minutes.
Capacitors are heat-sensitive components. Over time, internal degradation occurs due to environmental heat, frequent power surges, or the natural aging of the dielectric material. Keeping the motor area clean and free of debris to ensure proper airflow can help extend the life of your replacement.