MARS 12934 Run Capacitor

The MARS 12934 is a professional-grade 15 MFD 440V oval run capacitor engineered for demanding HVACR applications. Designed for 440 VAC motor run operations, this component effectively regulates current flow and improves motor efficiency in condenser fan motors and small compressor circuits. Built with high-grade metallized polypropylene film, it features a dielectric fluid fill for superior heat dissipation under continuous load. The non-PCB construction ensures environmental safety, while the integrated pressure sensitive interrupter provides a critical fail-safe by disconnecting the capacitor at the end of its service life or under extreme internal pressure. This oval motor capacitor is rated for 50/60 Hz and operates within a wide temperature range, making it a reliable choice for field replacements where 15 microfarad 440 volt specifications are required. Its multi-spade terminals allow for quick, secure wiring during proactive maintenance or emergency system repairs.

Key Benefits for Technicians

• Dual Voltage Compatibility: Rated for up to 440 volts, making it a versatile replacement for both 370V and 440V applications.
• Physical Resilience: Housed in a ruggedized, corrosion-resistant oval aluminum casing to withstand harsh mechanical room environments.
• Safety Compliance: UL/CSA recognized with internal protection mechanisms to prevent casing rupture during failure.
• Operational Stability: Maintains tighter capacitance tolerances to ensure optimal motor torque and reduced amperage draw.

Common Installation Questions

Can I use a 440V capacitor if the original was 370V?
Yes, you can safely substitute a 440V rated capacitor for a 370V unit, provided the microfarad (MFD/µF) rating remains identical. This higher voltage rating provides a larger safety margin for voltage spikes.

What indicates a failing run capacitor in an AC system?
Field indicators include a "humming" motor that fails to start, high amperage readings, or physical signs such as bulging, leaking fluid, or "mushrooming" of the capacitor top.

Is the MARS 12934 compatible with 50Hz systems?
Yes, this unit is engineered for 50/60 Hz operation, making it suitable for standard domestic power grids and various international equipment configurations.

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.