Motor Run Capacitors, 70/10 MFD, (440V)

Mars 12169 – 70/10 MFD 440V Dual Motor Run Capacitor, Round Case

The Mars 12169 is a dual-section motor run capacitor engineered for single-phase permanent split capacitor (PSC) motors. Rated at 70/10 microfarads (MFD) and 440 volts AC, this capacitor supports both compressor and fan motor operation in residential and light commercial HVAC systems. It is commonly used in air conditioning and heat pump units where a single component is needed to serve two capacitance loads simultaneously.

This unit is part of the Mars Blue Box series and is built with a rolled aluminum shell, oil-filled dielectric, and internal pressure-sensitive interrupter for fault protection. It is designed to meet EIA-456-A performance standards and UL-recognized safety requirements for HVAC components.

Technical Specifications

• Capacitance: 70/10 MFD ±6%
• Voltage Rating: 440 VAC, 50/60 Hz
• Case Type: Round aluminum
• Dielectric: Non-PCB, oil-filled
• Terminals: ¼" quick-connect, labeled C (Common), HERM (Compressor), FAN
• Operating Temp: -40°C to +70°C

Physical Dimensions

• Diameter: Approx. 2.5 inches
• Height: Approx. 5.0 inches (excluding terminals)

Installation Guidelines

The Mars 12169 should be installed by trained HVAC personnel. Confirm motor specifications match the capacitor's microfarad and voltage ratings prior to replacement. Disconnect all power, safely discharge the existing capacitor, and use insulated terminals for all connections. Ensure secure mounting within a UL-listed bracket or strap and inspect for proper polarity and contact integrity before re-energizing the unit.

Application and Use

This dual capacitor is suitable for HVAC systems requiring a single component to support both compressor and condenser fan motor functions. Its 440V rating allows it to withstand high-voltage fluctuations and motor startup loads typical in modern split systems. The 70/10 MFD configuration is widely used across OEM platforms, making it a common service part in both residential and light commercial applications.

Contractor-Oriented Advantages

• ✅ Dual Capacitance Support – Combines two values in one housing for compressor and fan circuits
• ✅ High Voltage Rating – Operates reliably in systems subject to line voltage surges
• ✅ Built-In Interrupter – Protects equipment by disabling the capacitor under internal fault conditions
• ✅ Service-Grade Durability – Designed for extended field life under daily motor cycling
• ✅ Standard Round Form Factor – Fits most OEM control panels and bracket designs