40+10 uF 370-440 VAC ±5% Volts Round Run Start Capacitor

40+10 uF 370-440 VAC ±5% Volts Round Run Start Capacitor

Key Features

• Dual capacitance rating: 40 microfarad (uF) for compressor, 10 uF for fan motor
• Dual voltage rating: 370 or 440 VAC
• Capacitance tolerance: ±5%
• Operating frequency: 50/60 Hz
• Case: Round aluminum can with moisture and oil resistance
• Terminals: Three-post design (C, FAN, HERM) with 1/4 inch male quick-connects
• Operating temperature: -40°C to 70°C (-40°F to 158°F)
• Safety protection: 10,000 AFC (Ampere Fault Current) internal protector

Replaces / Cross-Reference Part Numbers

• Replaces any dual round motor run capacitor with matching 40/10 uF and 370V or 440V specifications.
• Check the label of your original capacitor for matching capacitance (e.g., 40/10, 40+10, 40+10 MFD) and voltage ratings.
• Known to replace parts such as USA2232A and 40/10DVR.

Compatibility & Fitment

• Designed for continuous duty in single-phase motor applications.
• Common in residential and light commercial HVAC systems.
• Suitable for use in:
  • Air conditioner condensing units
  • Heat pumps
  • Compressor motors
  • Condenser fan motors
  • Refrigeration systems

When to Replace

• Compressor or fan motor fails to start or struggles to start.
• A humming sound is audible, but the motor does not engage.
• Capacitor casing is visibly swollen, bulging, cracked, or leaking fluid.
• The unit starts but shuts down after a short period.
• A capacitance test reading is outside the specified ±5% tolerance.

Installation Tips

• Disconnect all electrical power to the main unit before beginning work.
• Safely discharge the existing capacitor by shorting across the terminals with an insulated screwdriver (e.g., C to HERM, then C to FAN).
• Verify the uF (MFD) and voltage ratings of the replacement capacitor match the component being replaced. The voltage rating can be equal to or higher, but never lower.
• Document or photograph the wire connections to each terminal (C, FAN, HERM) before disconnecting.
• Ensure the new capacitor is physically secured with the original mounting bracket.