MARS 12997 Run Capacitor

The MARS 12997 is a trade-grade 7.5 MFD 370 VAC round run capacitor engineered for persistent duty in HVACR systems. When you're dealing with internal motor winding heat or fluctuating line voltage, this 7.5 microfarad motor capacitor provides the precise phase shift required for optimal torque and energy efficiency. Designed to meet rigorous EIA-456-A standards, it features a physical round metal case that dissipates heat more effectively than plastic alternatives. For technicians looking for a HVAC run capacitor replacement, the 12997 is a direct fit for applications requiring 7.5 uF at 370 volts, and it can also safely replace lower-rated 330V units. The non-PCB oil-filled construction and integrated 10,000 AFC internal protection ensure the system remains safe in the event of a capacitor failure. This HVACR motor capacitor is built for extreme environments, rated for operation up to 70°C, making it a reliable choice for condenser fan motors and blower assemblies.

• High Temperature Rating: Engineered to withstand ambient temperatures up to 70°C for reliable service in hot condenser cabinets.
• Universal Compatibility: Standard round single value capacitor dimensions ensure a quick fit in existing mounting brackets.
• Safety Integrated: Features a pressure-sensitive interrupter and 10,000 AFC (Available Fault Current) protection.
• Technical Precision: Maintains a ±6% tolerance to ensure your PSC motor runs within its designed slip and efficiency range.

Common Questions

Can I use a 440V capacitor to replace this 370V model?
Yes. You can always "up-rate" the voltage. A 440VAC capacitor will work in place of a 370VAC unit like the MARS 12997, provided the microfarad (7.5 uF) rating and physical dimensions match your mounting space.

How do I know if this run capacitor is failing?
Look for physical signs like a bulged top or leaking oil. Electrically, if the capacitance drops more than 6-10% below 7.5 MFD, the motor will pull higher amps and eventually overheat or fail to start.

Does it matter which wire goes to which terminal?
On a single-value run capacitor like this one, the terminals are generally not polarized; however, standard practice is to connect the "Herm" or start winding to one side and the "Line" or "Common" to the other as per the motor's wiring schematic.

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.