MARS 12766 Run Capacitor

The MARS 12766 is a professional-grade 35/5 MFD 370V round dual run capacitor engineered for demanding HVACR applications. Designed for permanent split capacitor (PSC) motors, this component provides the essential phase shift required for both compressors and condenser fan motors in residential and light commercial AC units. It serves as a direct replacement for CAP050350370RSS, ensuring seamless mechanical and electrical compatibility during field service. Constructed with non-PCB oil-filled metallized polypropylene film, the unit features a high-grade plastic or metal case designed to meet the EIA-456-A standard. The quad-blade quick-connect terminals facilitate rapid wiring, while the internal pressure interrupter provides a critical safety mechanism by disconnecting the capacitor at the end of its service life to prevent case rupture. This dual-section capacitor maintains stable capacitance tolerances of +/- 5%, ensuring optimal motor torque and efficiency under high-heat conditions.

Key Benefits for Technicians:

• Dual-Purpose Design: Consolidates inventory by handling both 35 MFD and 5 MFD requirements in a single round housing.
• Enhanced Reliability: Rated for 370 VAC operation with a 10,000 AFC (Available Fault Current) safety rating.
• Broad Compatibility: Cross-references directly with major OEM brands, including Jarden Zinc and Packard equivalents.
• Field Service Efficiency: Features physical dimensions optimized for standard mounting brackets in most condensing units.

Common Installation Questions:

Can I use a 440V capacitor if the original was 370V?
Yes, a 440V capacitor is a suitable upgrade for a 370V application as it offers a higher dielectric strength, though the physical diameter should be verified for bracket fitment.

What does the +/- 5% tolerance mean for motor performance?
This tolerance ensures the capacitor maintains precise microfarad output, which is critical for preventing motor overheating and maintaining the correct magnetic field alignment in the windings.

How do I identify the common terminal?
The terminal marked 'C' is the common line, 'HERM' connects to the compressor start winding, and 'FAN' connects to the condenser fan motor.

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.