MARS 12943 Run Capacitor

Professional HVAC technicians rely on the MARS 12943 Run Capacitor for high-duty cycle applications requiring a persistent phase shift. This 35 MFD 440V oval run capacitor is engineered to withstand the rigorous demands of residential and commercial condensing unit motors and blower assemblies. As a technical-grade OEM replacement capacitor, it serves as a direct substitute for failing units that exhibit bulging cases or dropped capacitance, which often lead to high-amp draw and motor overheating.

The MARS 12943 features a standard 440 VAC rating, making it a versatile choice for both 370V and 440V systems. Its oval aluminum case design facilitates heat dissipation, extending the functional life of the internal metallized polypropylene film. With a wide operating temperature range of -40°C to 70°C and 50/60 Hz frequency compatibility, this 12943 35 microfarad capacitor ensures consistent torque and RPM stability for induction motors in the field. Dual terminals allow for rapid, secure lead connections during emergency service calls.

Key Benefits

• Universal Voltage Compatibility: Rated at 440Vac, allowing it to safely replace 370Vac units for increased dielectric strength.
• Non-PCB Construction: Utilizes environmentally safe, non-toxic oil for cooling and electrical insulation.
• Internal Pressure Interrupter: Integrated safety mechanism disconnects the capacitor at the end of its lifecycle to prevent case rupture.
• Corrosion-Resistant Housing: Standard oval aluminum casing provides superior protection against moisture and debris in outdoor enclosures.

Common Questions

• Can I use a 440V capacitor if my original was 370V? Yes. You can always increase the voltage rating, but never decrease it. The 12943 440V rating provides a higher margin of safety.
• What is the tolerance range for this 35 MFD rating? This unit typically maintains a +/- 5% or 10% tolerance; always verify that the actual MFD reading is within these specs during preventative maintenance.
• How do I confirm the 12943 fits my current bracket? This is an oval-base capacitor. Standard oval mounting straps or brackets used for 35 MFD 440V units are compatible.

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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.