Run Start Capacitor, Round, 85/10 MFD, 440/370

Mars 12944 – Dual Motor Run Capacitor for PSC HVAC Applications

The Mars 12944 is a dual-rated motor run capacitor engineered for use in permanent split capacitor (PSC) motor applications. With capacitance values of 85/10 microfarads (MFD) and a voltage rating of 440V AC, this component is suited for HVAC systems requiring simultaneous support for compressor and fan motor circuits. The round aluminum construction and sealed design make it a durable solution for field service replacements and OEM-equivalent installations.

Designed to handle the electrical demands of continuous operation, the Mars 12944 is part of the JARD capacitor series and conforms to industry requirements for thermal endurance, voltage stability, and mechanical reliability.

Capacitor Features and Functional Attributes

• ✅ Dual Value Configuration – Combines 85 MFD and 10 MFD capacitance in a single housing, minimizing component count in dual-motor systems.
• ✅ Rated at 440V AC – Supports high-voltage HVAC equipment and resists dielectric breakdown under elevated load conditions.
• ✅ Round Hermetically Sealed Case – Aluminum enclosure with moisture and corrosion resistance, suitable for vertical or horizontal mounting.
• ✅ Oil-Free Construction – Uses metallized polypropylene film and is free of hazardous materials.

Technical Specifications

• Model: Mars 12944
• Capacitance: 85/10 MFD (microfarads)
• Voltage Rating: 440V AC
• Shape: Round
• Application: Dual motor run support for HVAC PSC motor systems

Installation Requirements

Installation must be performed by a qualified technician in accordance with applicable electrical codes. Power to the unit should be isolated before removing or installing any capacitor. Terminal identification must be verified to match system requirements for both compressor and fan motor connections.

• ???? Tools Required: Screwdriver, nut driver, multimeter (with MFD function)
• ???? Safety Considerations: Use insulated tools and appropriate PPE. Follow LOTO (lockout/tagout) procedures.
• ⚙️ Verification: Confirm capacitance with a calibrated multimeter before re-energizing equipment.

Ensure the capacitor is securely mounted to reduce vibration impact. Spade terminal leads should be inspected for integrity and tightened to prevent electrical arcing or fatigue.

Use Case Overview

The Mars 12944 is ideal for HVAC systems requiring a dual-motor run capacitor with higher capacitance values. Typical applications include residential and commercial air conditioners, heat pumps, and refrigeration units where compressor and condenser fan motors share a capacitor assembly. It is compatible with a range of OEM specifications requiring 85/10 MFD, 440V support.

Product Highlights for HVAC Professionals

• ✅ Dual Support in One Unit – Simplifies installations and reduces service inventory requirements.
• ✅ High Voltage Tolerance – Suitable for environments subject to voltage fluctuations or thermal load cycles.
• ✅ Service-Ready Build – Designed for routine field replacement and scheduled preventative maintenance programs.
• ✅ Reliable Manufacturer Lineage – Part of the Mars JARD series, trusted in the HVAC industry for performance and compatibility.

Professional Summary

The Mars 12944 Dual Motor Run Capacitor is a dependable component for supporting PSC compressor and fan motors in HVAC systems operating at 440V. Its high capacitance rating, sealed aluminum construction, and industry-standard dimensions make it a reliable solution for contractors handling replacement, upgrade, or retrofit applications. Built for electrical stability and long-term operation, it meets the demands of modern HVAC service environments.