MARS 12821 Run Capacitor

Stocking the MARS 12821 Run Capacitor ensures you have a reliable, multi-application 80/10 MFD 440V dual run capacitor ready for demanding condenser fan and compressor service calls. Built into a round aluminum case, this dual section motor run capacitor is engineered for continuous duty in HVACR systems, providing the necessary phase shift to maintain motor torque and efficiency. With a 440VAC rating, it is backward compatible with 370V systems, offering a rugged upgrade for high-stress environments. The non-PCB, oil-filled design includes a built-in physical interrupter for safety, disconnecting the internal membrane if pressure builds due to excessive heat or electrical stress. Rated for 60,000 operational hours and operating within a temperature range of -40°C to +70°C, this JARD 12821 replacement meets EIA-456A standards. Its 1/4-inch quick-connect terminals are clearly marked for 'C', 'FAN', and 'HERM' to streamline wiring on the job site. This is a standard AC capacitor replacement for units requiring high-capacitance 80 microfarad and 10 microfarad support.

• Dual-application design supports both the compressor and the condenser fan motor from a single compact unit.
• High voltage tolerance allows the 440V rating to safely replace 370V capacitors, improving performance overhead.
• Standardized round chassis fits most universal mounting brackets and strap configurations found in residential and light commercial equipment.
• Internal safety interrupter protects the system by opening the circuit in the event of a capacitor failure or bulge.
• Contractor-grade reliability with a -40°C to +70°C operating range, suitable for extreme climate conditions.

Can I use this 440V capacitor to replace a 370V unit?
Yes. You can always increase the voltage rating when replacing a capacitor, provided the microfarad (MFD) ratings match the motor nameplate. The 440V rating is a heavy-duty alternative that handles voltage spikes more effectively than a 370V unit.

What happens if the capacitance (MFD) rating is incorrect?
Using a capacitor with the wrong MFD rating can lead to excessive heat in the motor windings. If the MFD is too low, the motor may fail to start or run at a reduced speed; if it is too high, it may cause the motor to draw too much current, leading to premature failure.

Does the physical size of the capacitor matter?
While the electrical specifications are the primary concern, the physical dimensions must allow the part to fit inside the control box. The MARS 12821 features a standard round diameter that is compatible with most OEM and universal mounting straps.

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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.