MARS 12905 Run Capacitor

The MARS 12905 Run Capacitor is a high-performance 5 MFD 370V oval component designed for continuous duty in single-phase motor applications. Engineered to meet the rigorous demands of HVAC/R contractors, this single capacitance unit is a direct OEM replacement for the P00340 and various GE/Genteq 97F series capacitors. It is commonly utilized in condenser fan motors and small blower applications to maintain steady torque and efficiency.

Constructed within a rugged aluminum housing, the MARS 12905 features 4-terminal quick-connect posts for secure wiring in tight enclosures. The non-PCB fluid and integrated physical interrupter ensure safe failure modes, protecting the surrounding system during over-voltage conditions. Rated for 60,000 hours of operational life at up to 70°C, it provides consistent phase shift performance across 50/60 Hz frequencies.

• Universal Compatibility: Serves as a direct cross-reference for leading brands including JARD, Titan PRO, and Carrier P291-0503 parts.
• Space-Saving Geometry: The oval run capacitor profile is ideal for compact motor control boxes where round capacitors may not fit.
• High Temperature Resilience: Reliable operation in extreme rooftop environments with a range of -40°C to +70°C.
• Contractor Grade Durability: UL and CUL approved construction with a 10,000 AFC safety protection rating.

Can I use a 440V capacitor to replace a 370V 5 MFD capacitor?
Yes, in modern HVAC systems, a 440 VAC capacitor can replace a 370 VAC unit as long as the microfarad (MFD) rating is an exact match. The higher voltage rating indicates a thicker internal dielectric but will not negatively affect motor performance.

Is this a dual or single capacitance capacitor?
The 12905 is a single run capacitor. If your system requires a dual capacitor (typically for a compressor and fan combo), you would likely see two MFD ratings (e.g., 35/5). This unit is dedicated to a single motor circuit.

How do I know if my 5 MFD capacitor is failing?
Common indicators include a bulging top, visible oil leaks, or a motor that hums without starting. Technicians should verify the MFD output with a multimeter; a variance exceeding +/- 6% typically requires replacement.

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.