Rectorseal M12172 Dual Run Capacitor 45/10 Mfd 440V

Product Description

The RECTORSEAL M12172 is a dual run capacitor rated at 45/10 microfarads (MFD) and 440 volts, designed to support the start and run cycles of single-phase compressor and fan motor circuits in air conditioning and heat pump systems. Dual run capacitors combine two capacitance values in a single round housing, reducing cabinet space and simplifying replacement. The round form factor measures 2.5 inches in diameter and 4.375 inches in height, making it a compact fit for most residential condensing unit electrical compartments. Licensed HVAC technicians install this component as a direct replacement when original capacitors show signs of failure such as bulging tops, low capacitance readings, or motor starting issues.

This capacitor is suited for residential and light commercial HVAC applications where a single-can dual run capacitor is required to serve both the compressor and the condenser fan motor simultaneously. The 440-volt rating provides compatibility across standard 208/230-volt single-phase systems and offers a voltage tolerance margin above the typical 370-volt minimum found in many OEM applications. It installs in the electrical compartment of split-system air conditioners and heat pumps and is a common service replacement during the cooling season.

Key Features

• Dual capacitance rating: 45 MFD for compressor and 10 MFD for condenser fan motor in a single housing
• 440-volt rating compatible with standard 208/230-volt single-phase residential systems
• Round form factor fits most OEM condensing unit capacitor brackets and terminals
• Compact dimensions of 2.5 inches diameter by 4.375 inches height for tight electrical compartment fitment
• Single-can design reduces component count and simplifies field replacement

Compatibility

Designed as an OEM-style replacement dual run capacitor for residential and light commercial single-phase air conditioning and heat pump condensing units requiring a 45/10 MFD 440-volt round capacitor.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect and lock out all power to the condensing unit before servicing the electrical compartment, and discharge the existing capacitor safely before handling or removing it, as capacitors can retain a dangerous charge even after power is removed. Verify terminal labeling (HERM, FAN, COM) before making connections, and confirm the replacement capacitor MFD ratings and voltage rating match or exceed the equipment nameplate requirements. Follow applicable NEC guidelines for electrical service on HVAC equipment.

Technical Specifications

• Capacitance: 45/10 MFD
• Voltage Rating: 440 volts
• Shape: Round
• Diameter: 2.5 inches
• Height: 4.375 inches
• UPC: 685744121725

Standard Information

• Brand: RECTORSEAL
• Manufacturer Part Number: M12172