Mars M12243 Round Run Capacitor 35 Mfd 440V

Product Description

The MARS M12243 is a round run capacitor rated at 35 microfarads (MFD) and 440 volts, designed for single-capacitor motor run applications in HVAC equipment. Run capacitors store and release electrical energy to maintain a steady phase shift in single-phase motors, improving torque and efficiency during continuous operation. This unit is a direct-replacement style capacitor suited for use in condensing units, air handlers, and other motor-driven HVAC components. Installation is typically performed by a licensed HVAC technician as part of a motor replacement or capacitor failure diagnosis.

The M12243 is commonly used in residential and light commercial HVAC systems where a single round run capacitor is required. Typical applications include condenser fan motors and compressor run circuits in split-system air conditioners and heat pumps. The 440-volt rating provides a safety margin above standard 370-volt circuits, making it a widely accepted substitute in both 370V and 440V rated applications.

Key Features

• 35 MFD capacitance rating for single-phase motor run circuits
• 440-volt rating suitable for use in 370V and 440V applications
• Round form factor for compatibility with standard capacitor mounting brackets
• Designed as a direct OEM-style replacement to reduce downtime on service calls

Compatibility

Designed as an OEM-style replacement for single round run capacitors used in residential and light commercial HVAC condensing units and air handlers requiring a 35 MFD 440-volt round capacitor.

Installation Notes

Run capacitors must be installed by a qualified HVAC technician. Disconnect and lock out all power to the unit before handling capacitors, and discharge the capacitor safely before removal, as stored voltage can remain after power-down. Verify the replacement MFD and voltage rating match or exceed the original equipment specification before installation. Follow all applicable local codes and the equipment manufacturer's wiring diagram during replacement.

Technical Specifications

• Capacitance: 35 MFD
• Voltage Rating: 440 volts
• Shape: Round
• UPC: 685744122432

Standard Information

• Brand: MARS
• Manufacturer Part Number: M12243