Run Start Capacitor, Round, 50/10 MFD, 440/370

Mars 12892 – Dual Rating Motor Run Capacitor for HVAC Systems

The Mars 12892 is a dual-value run capacitor used in HVAC systems that operate permanent split capacitor (PSC) motors. Rated at 50/10 microfarads (MFD) with a 440/370V AC tolerance, this capacitor is engineered to support both compressor and fan motor circuits within a single component. The round aluminum housing is hermetically sealed to resist environmental degradation and mechanical stress during high-cycle operation.

This unit is commonly deployed in air conditioning condensers, heat pumps, and other HVAC assemblies where reliable start-up and continuous operation are essential to motor efficiency and service life.

Designed for Field Durability and Compatibility

• ✅ Dual Capacitance Configuration – Provides 50 MFD (compressor) and 10 MFD (fan motor) in one round-body design.
• ✅ 440/370V AC Rating – Suitable for standard residential and light commercial HVAC equipment operating under high voltage conditions.
• ✅ Hermetically Sealed Aluminum Canister – Offers long-term performance stability and moisture resistance.
• ✅ Standard Terminal Layout – Compatible with industry-standard mounting brackets and terminal lead spacing.

Technical Specifications

• Model: Mars 12892
• Type: Dual Motor Run Capacitor
• Capacitance: 50/10 MFD (Microfarads)
• Voltage: 440/370V AC
• Shape: Round
• Certification: UL Listed

Installation and Handling

This capacitor should be installed by certified HVAC technicians in accordance with local code requirements. Ensure all power is isolated and discharge the old capacitor safely before installation. Match capacitance and voltage ratings to system specifications and verify polarity and lead integrity before system startup.

• ???? Appropriate hand tools for panel and bracket access
• ???? Multimeter with capacitance test function
• ???? Electrical PPE and LOTO procedures

Mount the unit securely using existing hardware or approved clamps. Confirm all terminal connections are tight and corrosion-free to prevent heat buildup during continuous duty cycles.

Use Case Overview

The Mars 12892 is suited for installations in HVAC systems where two motor circuits require a consolidated capacitor. It is often specified in outdoor condenser units and packaged systems operating with PSC motors that demand precise capacitance regulation for optimal compressor and fan operation.

Product Performance Summary

• ✅ Dual-Section Operation – Optimizes space by combining start and run capacitance in one unit.
• ✅ High Ambient Compatibility – Operates reliably in environments with temperature fluctuation and voltage variation.
• ✅ UL Recognition – Tested and listed to ensure compliance with U.S. safety standards.
• ✅ Field-Proven Performance – A common replacement part in contractor inventories for residential and light commercial systems.

Professional Use Component

The Mars 12892 provides dependable start-up and continuous run support for HVAC motor assemblies requiring dual capacitance. It is a compact, serviceable solution for systems with limited internal space and high-capacitance demands. Designed for extended operation and easy field replacement, this capacitor helps maintain operational efficiency and reduce motor strain over time.