Run Start Capacitor, Round, 85/7.5 MFD, 440/370

Mars 12942 – 85/7.5 MFD Dual Motor Run Capacitor for HVAC Equipment

The Mars 12942, branded under ClimaTek, is a dual-rated run capacitor designed to provide continuous support for permanent split capacitor (PSC) motors in HVAC systems. With capacitance ratings of 85 and 7.5 microfarads (MFD) and a voltage rating of 440V AC, this capacitor is built for long-duty cycle operation in air conditioning condensers, heat pumps, and ventilation units requiring dual motor support.

Constructed with metallized polypropylene film and enclosed in a round aluminum canister, the Mars 12942 is engineered to withstand high electrical loads, thermal stress, and mechanical vibration in commercial and residential HVAC applications. The dual-capacitance design supports simultaneous operation of both compressor and fan motor circuits from a single unit.

Field-Ready Features for HVAC Professionals

• ✅ Dual Rating (85/7.5 MFD) – Supports two motor windings with distinct capacitance values in one component.
• ✅ 440V AC Voltage Rating – Designed to maintain performance stability under elevated line voltage conditions.
• ✅ Hermetically Sealed Aluminum Housing – Protects internal dielectric elements from moisture, dust, and vibration.
• ✅ Non-PCB Design – Manufactured with environmentally safer materials and compliant with current regulations.
• ✅ Standard Round Profile – Compatible with most mounting brackets and terminal configurations used in HVAC service panels.

Technical Specifications

• Model: Mars 12942
• Capacitance: 85/7.5 MFD (Microfarads)
• Voltage: 440V AC
• Type: Dual Motor Run Capacitor
• Shape: Round
• Application: PSC compressor and fan motor support in HVAC systems

Installation Requirements

Installation of the Mars 12942 should be performed by licensed HVAC professionals. Prior to installation, ensure the power is disconnected and any previously installed capacitor is safely discharged. Verify that replacement values match OEM equipment specifications for capacitance and voltage. Use appropriate PPE and observe proper torque when making terminal connections.

• ???? Tools: Screwdriver, nut driver, or ratchet for panel and bracket removal
• ???? Diagnostic: Multimeter with MFD testing capability
• ???? Safety: Insulated gloves, eye protection, and LOTO protocols

Ensure the capacitor is mounted securely to reduce exposure to vibration-induced failure. Recheck connections before system reactivation to confirm stable contact.

Service Use and Compatibility

The Mars 12942 is ideal for use in condenser units and package systems where high capacitance support is needed for both start and continuous run phases. Its 85/7.5 MFD configuration and high voltage tolerance are suited to demanding operating environments where performance degradation due to electrical fluctuation is a concern.

Key Benefits for Contractors

• ✅ Dual Motor Capability – Supports fan and compressor motors from a single enclosure to reduce inventory and simplify field service.
• ✅ Voltage Stability – Minimizes capacitance drift and maintains torque delivery under high-demand cycles.
• ✅ Durable Design – Engineered for use in high-cycle installations with minimal maintenance intervention.
• ✅ Trusted for Field Replacement – Compatible with a wide range of HVAC equipment requiring dual-value capacitors.

Summary for Professional Use

The Mars 12942 (ClimaTek) dual motor run capacitor offers dependable electrical support for HVAC systems that operate PSC motors in both compressor and fan configurations. Its high voltage rating, compact form factor, and dual-value output make it an ideal solution for service calls, system rebuilds, and long-term field replacements in heavy-use environments.