Rectorseal M12171 Dual Run Capacitor 40/5 Mfd 370V Oval

Product Description

The RECTORSEAL M12171 is a dual run capacitor rated at 40/5 microfarads (MFD) and 370 volts, designed for use in single-phase residential and light commercial HVAC systems. Run capacitors store and release electrical energy to maintain smooth motor operation in compressors and fan motors. This oval-style unit provides a compact form factor suited for installations where space inside the electrical compartment is limited. Licensed HVAC technicians install this component during routine seasonal maintenance or when diagnosing motor start and run faults in air conditioning and heat pump equipment.

This capacitor is commonly used in split-system air conditioners and heat pumps that require a single dual run capacitor to serve both the compressor and the condenser fan motor simultaneously. The 40 MFD rating supports the compressor circuit while the 5 MFD rating serves the fan motor circuit. The oval housing fits many standard capacitor brackets found in outdoor condensing units, making it a practical field replacement option for HVAC service technicians.

Key Features

• Dual run capacitor supports both compressor and condenser fan motor in a single unit
• 40/5 MFD rating covers common compressor and fan motor capacitor requirements
• 370-volt rating suitable for standard single-phase residential HVAC applications
• Oval form factor fits standard condensing unit capacitor brackets
• Compact dimensions allow installation in tight electrical compartments

Compatibility

Designed as an OEM-style replacement dual run capacitor for single-phase residential and light commercial air conditioning and heat pump condensing units requiring a 40/5 MFD 370-volt oval capacitor.

Installation Notes

Installation must be performed by a licensed HVAC technician. Disconnect and lock out all power to the condensing unit before servicing the capacitor compartment. Capacitors retain a dangerous electrical charge even after power is removed — discharge the capacitor using an insulated discharge tool before handling or removing terminals. Verify the MFD rating and voltage rating of the replacement capacitor match the equipment nameplate requirements before installation.

Technical Specifications

• Capacitance: 40/5 MFD
• Voltage Rating: 370 volts
• Style: Oval
• Width: 1.806 inches
• Length: 2.806 inches
• Height: 4.25 inches
• UPC: 685744121718

Standard Information

• Brand: RECTORSEAL
• Manufacturer Part Number: M12171