MARS 12747 Run Capacitor

The MARS 12747 Run Capacitor is a 45/3 Microfarad 370Vac Round Dual Run Capacitor engineered for high-demand HVACR applications. As a veteran-grade dual section motor run capacitor, it provides the essential phase shift required for optimal torque and efficiency in both the compressor and the condenser fan motor. This model is the direct replacement for 43-25133-05, ensuring a drop-in fit for Rheem, Ruud, and ProTech equipment without the need for mounting modifications. Built to EIA 456A standards and Tecumseh H-115 specifications, it features a non-PCB oil-filled design and a pressure-sensitive interrupter (PSI) for safety. The round dual run capacitor is rated for 50/60 Hz operation and supports 370 volts, though it can be replaced by a 440V equivalent if necessary. With 1/4 inch male quick-connect terminals, it offers high thermal stability and reliability under severe operating conditions.

• OEM-Spec Compatibility: Serves as the precise replacement for 43-25133-05, maintaining factory performance standards.
• Dual-Function Design: Integrates a 45 MFD compressor circuit and a 3 MFD fan circuit into a single space-saving round housing.
• Enhanced Safety: Includes an internal pressure-sensitive interrupter to prevent case rupture during end-of-life electrical failure.
• Industrial Durability: Constructed with a hermetically sealed case to resist moisture, oil, and debris in harsh outdoor environments.
• Technical Compliance: Meets UL 810 and CSA requirements, ensuring 5,000 AFC (Available Fault Current) protection.

Can I use a 440V capacitor to replace a 370V MARS 12747?
Yes, a higher voltage rating like 440VAC is a suitable upgrade and will handle voltage spikes more effectively, but never use a capacitor with a lower voltage than 370V.

What is the difference between MFD and uF on the 12747?
There is no difference; MFD and uF both represent microfarads, the unit of capacitance required to start and run the motor efficiently.

Does the MARS 12747 replace an oval capacitor?
If the 45/3 MFD and 370Vac ratings match, it is electrically compatible. However, since the 12747 is a round run capacitor, ensure the mounting bracket in your unit can accommodate the cylindrical shape.

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.