Run Capacitor, Round, 5 MFD, 440/370

Mars 12805 – 5 MFD Round Motor Run Capacitor for Single-Phase Motors

The Mars 12805 is a single-value motor run capacitor designed to support the operation of permanent split capacitor (PSC) single-phase motors. Rated at 5 microfarads (MFD) and 440/370V AC, this component provides continuous-phase shifting for improved torque and motor efficiency in HVAC and refrigeration applications.

Constructed with metallized polypropylene film and enclosed in a hermetically sealed aluminum housing, the 12805 is designed to maintain capacitance stability over long duty cycles and in environments subject to heat, vibration, or voltage fluctuation. This capacitor is part of the Mars JARD series, recognized for field reliability and OEM-grade construction.

Performance and Application Features

• ✅ Capacitance Rating: 5 MFD – Supports continuous operation in PSC motors where low capacitance is required for motor windings.
• ✅ Voltage Rating: 440/370V AC – Handles elevated line voltage and protects against electrical degradation in high-demand systems.
• ✅ Round Aluminum Canister – Sealed enclosure ensures protection from moisture and airborne contaminants.
• ✅ Non-PCB Design – Environmentally compliant and manufactured to modern safety standards.

Technical Specifications

• Model: Mars 12805
• Capacitance: 5 MFD
• Voltage Rating: 440/370V AC
• Shape: Round
• Application: PSC single-phase induction motors in HVAC and refrigeration systems

Installation Notes

Installation of the Mars 12805 should be performed by a licensed technician. Disconnect power to the unit before handling electrical components. Use a multimeter with MFD reading capability to verify the new capacitor before installation. Confirm that the replacement unit matches the OEM specifications for both capacitance and voltage.

• ???? Tools: Nut driver or screwdriver for mounting, multimeter for capacitance verification
• ???? PPE: Insulated gloves, safety eyewear
• ⚠️ Compliance: Follow all applicable electrical codes and grounding practices

Ensure secure mechanical mounting and tight terminal connections. Avoid over-tightening to prevent terminal stress or distortion.

Use Case Summary

The Mars 12805 is typically installed in condenser fan motors, blower motors, and other small single-phase PSC motors where 5 MFD capacitance is required. It supports continuous-duty operation and helps maintain efficient torque output while reducing overheating or phase imbalance in motor windings.

Contractor-Grade Benefits

• ✅ Stable Capacitance Output – Minimizes power fluctuation in fan or compressor motors over time.
• ✅ Standard Sizing – Compatible with most capacitor brackets and electrical terminals in HVAC cabinets.
• ✅ Trusted for Field Replacement – Manufactured under the Mars JARD line, known for reliability and longevity.
• ✅ Designed for Longevity – Dielectric materials and sealed construction reduce service frequency.

Professional Summary

The Mars 12805 Motor Run Capacitor delivers consistent electrical performance for HVAC and refrigeration motors requiring a 5 MFD, 440V component. Built with contractor-grade materials and tested to meet industry standards, it offers long-lasting reliability for use in preventative maintenance programs and emergency service replacements across a wide range of motor-driven equipment.