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[UL Certified] 30 uF MFD ±5% 370/440 VAC 50/60 Hz Multi-Purpose Motor Run Round Capacitor - For Air Conditioner, Heat Pump

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30 uF/MFD ± 5% 370 or 440 VAC Motor Run Round Capacitor

Key Features

  • Capacitance Rating: 30 Microfarad (uF/MFD)
  • Tolerance: ± 5%
  • Voltage: Dual voltage rated for 370 VAC or 440 VAC applications
  • Frequency: 50/60 Hz
  • Case: Round aluminum case with steel cover
  • Terminals: 1/4 inch male quick-connect terminals
  • Safety: Pressure-sensitive interrupter mechanism
  • Operating Temperature: -40° C to 70° C

Replaces / Cross-Reference Part Numbers

  • This capacitor replaces any round, single-capacitance 30 uF capacitor with a voltage rating of either 370V or 440V.
  • Always match the microfarad (uF/MFD) rating.
  • The replacement capacitor's voltage rating must be equal to or greater than the original capacitor.

Compatibility & Fitment

  • Commonly used for HVAC systems, air conditioner compressors, heat pumps, fan motors, and other electric motor applications.
  • The round shape and standard terminal configuration allow for wide compatibility with units from multiple manufacturers.
  • Verify physical dimensions (diameter and height) to ensure a proper fit within the existing mounting bracket and space.

When to Replace

  • The motor hums but fails to start or struggles to start.
  • The fan or compressor runs intermittently or at a reduced speed.
  • The top of the existing capacitor is swollen or bulging.
  • Fluid is leaking from the capacitor casing.
  • A multimeter test shows the capacitance is outside the specified tolerance range.

Installation Tips

  • Disconnect all electrical power to the equipment before beginning work.
  • Safely discharge the old capacitor by shorting the terminals with an insulated-handle screwdriver.
  • Note the wire placement on the old capacitor terminals before disconnecting. Taking a picture is recommended.
  • Connect the wires to the corresponding terminals on the new capacitor.
  • Secure the new capacitor with the original mounting strap or bracket.
Product image
  • 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

To ensure compatibility, you must match the MFD (microfarad) rating and the voltage (VAC) rating of your existing capacitor. This unit is rated for 30 uF and can safely replace capacitors rated for either 370 VAC or 440 VAC. While physical dimensions can vary between manufacturers, the electrical specifications must match your motor or compressor requirements exactly.
A failing capacitor often causes the motor or compressor to struggle to start, hum loudly without turning, or fail to start entirely. In some cases, the fan motor may only start if manually spun, or the air conditioner may blow warm air because the compressor is not engaging. If the top of the capacitor appears domed or swollen, it has failed and requires immediate replacement.
This is a single-run capacitor designed for applications requiring a 30 uF rating. It features two terminals for connection. If your system requires a dual-run capacitor (which typically has three terminals labeled 'C', 'HERM', and 'FAN'), this unit will not be compatible, as it does not provide the secondary capacitance needed for a fan motor.
Installation typically takes 15 to 30 minutes. You will need a screwdriver to access the electrical panel and a pair of insulated needle-nose pliers to disconnect and reconnect the spade terminals. Always ensure the power to the unit is completely shut off at the breaker before beginning work.
Capacitors store a lethal electrical charge even when the power is disconnected. After turning off the power at the breaker, you must discharge the capacitor by placing an insulated-handle screwdriver across the terminals to bridge the connection. Never touch the metal terminals with your bare hands until you have confirmed the capacitor is fully discharged.