MARS 12730 Run Capacitor

The MARS 12730 is a heavy-duty 35/3 MFD 370V dual run capacitor designed for high-demand HVACR applications where consistent motor torque and compressor reliability are non-negotiable. This round dual run capacitor features a dual-rated design, providing 35 microfarads for the hermetic compressor and 3 microfarads for the condenser fan motor. Built to professional standards, the MARS 12730 utilizes a non-PCB, oil-filled construction within a rugged aluminum case to ensure thermal stability and heat dissipation during peak summer cycles. Designed for 50/60Hz systems, this 35/3 microfarad capacitor includes a built-in pressure sensitive interrupter (PSI) to safely disconnect the circuit in the event of internal failure, preventing casing rupture. It serves as a direct-fit replacement for various OEM and aftermarket 370Vac run capacitors, ensuring your equipment maintains proper power factor correction and efficiency.

• High-Grade Construction: Encased in a rust-resistant aluminum housing with a non-PCB, soybean-based oil fill for superior environmental safety and heat management.
• Integrated Safety Features: Features a patented internal pressure interrupter that provides a failsafe disconnection in high-pressure or end-of-life scenarios.
• Wide Compatibility: Designed for use in central air conditioning units, heat pumps, and refrigeration systems requiring a dual 35+3 MFD configuration.
• Standardized Terminals: Equipped with standard 1/4-inch male quick-connect terminals clearly labeled for C (Common), HERM (Compressor), and FAN.
• Operational Resilience: Rated for a temperature range of -40°C to +70°C, allowing for stable performance in unconditioned outdoor cabinets.

Can I use a 440V capacitor to replace this 370V unit?
Yes, in accordance with standard HVAC electrical practices, you can upgrade to a higher voltage rating (like 440V) as long as the 35/3 MFD capacitance remains the same. You must never replace a capacitor with one of a lower voltage rating.

What are the signs that a MARS 12730 needs replacement?
Technicians should look for physical bulging (doming) at the top of the terminal plate, oil leaks, or a compressor "hard starting" with a distinct humming sound. Use a multimeter to verify if the capacitance has drifted more than ±6% from the 35/3 rating.

Does the shape matter if my original was an oval capacitor?
The electrical function is identical; however, because the MARS 12730 is round, ensure the mounting strap in the condenser cabinet can accommodate a round diameter of approximately 2 inches.

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.