MARS 12904 Run Capacitor

The MARS 12904 Run Capacitor is a high-reliability, 4 Microfarad 370Vac Oval Run Capacitor designed for continuous duty in residential and commercial HVACR systems. As a professional-grade component, this 4 MFD 370V motor capacitor is specifically engineered to replace the P291-0403 and various OEM equivalents like the GE 97F5704. It features a robust metallized polypropylene film construction housed in a durable aluminum case, ensuring stable capacitance and efficient motor starting for permanent split capacitor (PSC) motors.

Operating within a standard 50/60Hz frequency, the MARS 12904 is rated for temperatures ranging from -40°C to 70°C. It includes a patented internal pressure-sensitive interrupter for safety, designed to disconnect the capacitor in the event of an internal failure. The HVAC oval run capacitor utilizing 1/4-inch quad-blade quick-connect terminals facilitates seamless integration during field service, maintaining the tight tolerances required for modern high-efficiency compressor and fan motor applications.

Key Benefits for Technicians:

• Direct Cross-Reference: 12904 is identical to P291-0403 and replaces common industry parts such as 12004, C304L, and 27L571.
• Industrial Safety Standards: Built with a physical interrupter and non-PCB biodegradable synthetic oil for environmentally conscious and safe operation.
• Durable Construction: Features a drawn steel/aluminum oval case that resists corrosion and handles harsh mechanical room environments.
• High Precision: Maintained with a +/- 6% capacitance tolerance to protect motor windings from improper current draw.

Common Professional Questions:

What are the physical dimensions of the MARS 12904?
The can height is approximately 1-5/8 inches, with a total height including terminals of 2-1/8 inches. The oval base measures 2 inches in length and 1-1/4 inches in width.

Can I use a 440V capacitor if the 370V is unavailable?
Yes, in HVACR applications, a capacitor with a higher voltage rating (like 440V) can replace a 370V unit as long as the microfarad (MFD) rating is an exact match and it fits the physical mounting bracket.

Is this capacitor compatible with both 50Hz and 60Hz systems?
Yes, this component is rated for universal 50/60Hz operation, making it suitable for a wide range of motor applications.

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.