MARS 12857 Run Capacitor

The MARS 12857 Run Capacitor is a high-performance 60/10 MFD 370V oval dual run capacitor engineered for HVACR outdoor condensing units. Designed to support both the compressor motor and the condenser fan motor, this dual section motor run capacitor provides critical phase shift and current limiting for Permanent Split Capacitor (PSC) systems. This JARD 12857 replacement features an aluminum case construction with non-PCB fluid and a built-in pressure-sensitive interrupter to ensure safe circuit interruption in case of failure.

Operating across a frequency range of 50/60 Hz and a temperature rating of -40°C to +70°C, this HVAC capacitor is built to maintain stable capacitance under high-demand electrical loads. Its oval 370 VAC configuration makes it a preferred choice for HVAC contractors seeking a reliable aftermarket replacement for MARS 12157 or Titan HD POCD6010A. The standard 4-blade terminals allow for quick C-HERM-FAN wiring, ensuring accurate motor torque and efficient compressor startup.

Key Benefits

• Universal Compatibility: Serves as a direct replacement for 60/10 microfarad 370V or 440V oval capacitors in residential and commercial AC systems.
• Dual-Section Utility: Houses two independent capacitance values (60 MFD for the compressor, 10 MFD for the fan) in a single space-saving oval housing.
• Contractor Grade Reliability: Rated for 60,000 hours of operational life, meeting UL and CUL safety standards for the HVACR industry.
• Physical Interrupter: Integrated safety mechanism disconnects the capacitor internally to prevent case rupture during extreme voltage spikes.

Common Questions

Can I use a 440V capacitor if the old one was rated for 370V?
Yes, a higher voltage rating (440V) can safely replace a lower voltage rating (370V) in the same MFD range, as it provides a higher dielectric strength against voltage spikes.

Does the shape (oval vs. round) matter for performance?
No, as long as the microfarad (MFD) and voltage ratings match. However, the oval shape is critical for physical fitment within specific condenser mounting brackets.

What are the signs of a failing dual run capacitor?
Technicians should look for a "bulging" top, oil leaks, or a multimeter reading outside the +/- 5% tolerance range. Symptoms include the compressor failing to start (hard start) or the fan motor humming without rotation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.