55 uF/MFD 370-440VAC Round Run Start Capacitor

Key Features

• Capacitance: 55 Microfarad (µF/MFD)
• Voltage Rating: 370V or 440V AC
• Tolerance: ±6%
• Frequency: 50/60 Hz
• Shape: Round
• Construction: Oil-filled metal can
• Terminals: ¼ in. male quick-connect
• Safety: Contains no Polychlorinated Biphenyls (PCBs)
• Protection: Features an internal pressure-sensitive interrupter
• Operating Temperature: -40°C to +70°C

Replaces / Cross-Reference Part Numbers

• C355R
• C455R
• 97F9042
• 97F9010
• 12752

Compatibility & Fitment

• Designed for continuous duty in motor run applications.
• Used in air conditioner condensers, heat pumps, furnace blowers, and other single-phase AC motors.
• Compatible with systems specifying either a 370VAC or 440VAC capacitor. A 440VAC capacitor can safely replace a 370VAC unit.

When to Replace

• The motor hums but will not start or struggles to start.
• The fan or compressor fails to turn on.
• Visible signs of damage, such as a swollen or bulging top, cracks, or leaking oil.
• Capacitance measures outside the specified tolerance range when tested with a multimeter.

Installation Tips

• Disconnect all electrical power to the equipment before servicing.
• Safely discharge the existing capacitor by shorting the terminals with a properly insulated tool.
• Confirm that the capacitance (MFD/µF) and voltage ratings are appropriate for your application.
• Ensure terminals are connected securely. Polarity is not a factor for this type of AC capacitor.

Compatibility & Fitment