MARS 12902 Run Capacitor

The MARS 12902 is a professional-grade 2 MFD 370V oval run capacitor designed for continuous duty in residential and light commercial HVACR systems. As a veteran technician knows, maintaining the precise microfarad rating is critical for motor efficiency and preventing winding overheating. This MARS 12902 run capacitor features a durable aluminum case and is filled with non-PCB dielectric fluid to ensure optimal heat dissipation during long run cycles. It is commonly utilized in furnace blower motors, inducer motors, and small exhaust fan applications where a stable phase shift is required. With a 370Vac rating, this unit provides the necessary insulation margin for standard 240V systems while maintaining a compact oval physical profile for tight cabinet installations. When you are out on a service call, this 12902 serves as a reliable replacement for any 2 microfarad 370V oval capacitor, ensuring the motor starts under load and runs within its design parameters.

• Precise Capacitance: Rated at exactly 2 MFD to ensure proper phase angle and motor torque.
• Universal Compatibility: Standard oval run capacitor geometry fits most OEM mounting brackets in furnace and AC cabinets.
• Industrial Construction: Encased in a rugged, leak-proof aluminum housing for high-ambient temperature stability.
• Safe Operation: Safety-interrupter protected and contains no PCBs, meeting modern environmental and safety standards.
• High Voltage Margin: The 370Vac rating provides a robust dielectric barrier against back-EMF spikes from the motor windings.

Can I use a 440V capacitor to replace this 370V MARS 12902?
Yes, in HVACR applications, you can always uprate the voltage. A 440V capacitor will provide a higher insulation breakdown point and often run cooler, but you must ensure the 2 MFD rating matches the motor specifications exactly.

What are the signs that a 2 MFD run capacitor has failed?
Technicians should look for physical bulging of the oval casing, oil leaks, or a motor that hums but fails to start. Testing with a multimeter should show a reading within +/- 10% of the 2 microfarad rating; otherwise, the part requires immediate replacement.

Does the orientation of the oval capacitor affect its performance?
No, the MARS 12902 can be mounted in any orientation. However, it is standard practice to secure it firmly with a mounting strap to prevent vibration damage to the terminals.

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.