MARS 12914 Run Capacitor

The MARS 12914 is a professional-grade 20 MFD 370V run capacitor designed for consistent motor performance in residential and commercial HVAC systems. As a primary motor run capacitor, this oval-shaped component maintains the phase shift necessary for efficient motor operation in air conditioning units and furnace blower motors. This specialized 370 VAC capacitor is the direct replacement for CPT00946, ensuring exact physical and electrical compatibility during field service. Constructed with a durable aluminum case and a non-PCB dielectric fluid, it is engineered to withstand demanding environments with an operating temperature range of -40°C to 70°C. The MARS 12914 features high-quality 1/4-inch quick-connect terminals for secure wiring and a physical interrupter for internal safety. This 20 microfarad 370V run capacitor provides a reliable solution for technicians looking to restore peak efficiency and torque to single-phase motors while meeting stringent UL and CSA safety standards.

Key Benefits:

• Universal Compatibility: Serves as the precise direct replacement for CPT00946, reducing downtime and streamlining inventory for common HVAC repairs.
• Enhanced Thermal Stability: Rated for a temperature range of -40°C to 70°C, ensuring reliable HVAC motor performance under extreme climate conditions.
• Safety Interrupter: Integrated physical pressure interrupter disconnects the capacitor at the end of its functional life to prevent case rupture.
• Standardized Form Factor: The oval run capacitor design fits standard mounting brackets in various fan motor and compressor housings.

Common Questions:

Can I use a 440V capacitor if my original was 370V?
Yes. In HVAC electrical maintenance, you can use a capacitor with a higher voltage rating (e.g., 440V) to replace a 370V unit, provided the microfarad (MFD) rating is an exact match. However, you cannot use a lower voltage rating than the original equipment specifies.

What are the signs of a failing 12914 capacitor?
Common indicators include a bulging or "mushroomed" top, oil leaks around the terminals, or a humming motor that fails to start. Testing with a multimeter set to capacitance (MFD) should show a reading within +/- 6% of the 20 MFD rating.

Does it matter which wire goes to which terminal on a single-run capacitor?
On a single-run capacitor like the MARS 12914, there is no polarity. You can connect the "Herm" or "Fan" wires interchangeably between the terminal posts as long as the circuit is completed according to the manufacturer's wiring diagram.

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.