MARS 11921 Start Capacitor

The MARS 11921 Start Capacitor is a 324-388 MFD, 110/125V AC round electrolytic capacitor engineered to provide the essential starting torque for fractional horsepower single-phase motors and refrigeration compressors. Designed for intermittent duty in HVAC systems and industrial machinery, this component ensures efficient motor engagement in high-demand cycles. The JARD by MARS series 11921 is a professional-grade replacement for several standard industry part numbers, including PMJ324, CS324X110, and 11021.

Constructed within a hermetically sealed black Bakelite case, this unit is built to withstand harsh mechanical environments by shielding internal elements from moisture, oil, and dirt. It features standard dual blade terminals for fast field connections and a phenolic resin composition that preserves electrical integrity across an operating temperature range of -40°C to +65°C (-40°F to 149°F). With a compact case size 2 profile (approximately 1.437" diameter x 2.75" length), it fits comfortably in standard motor terminal boxes and capacitor cans.

Key Benefits:

• Enhanced Starting Torque: Provides the 324-388 microfarad boost required to overcome inertia in heavy-duty compressors and fan motors.
• Bakelite Housing: The rugged, non-conductive Bakelite case prevents arcing and protects against environmental contaminants like grease and humidity.
• Universal Compatibility: Serves as a direct technical match for MARS 11021, Packard PMJ324, and Supco CS324X110.
• Optimized Duty Cycle: Rated for up to 20 starts per hour with a 3-second start duration, meeting EIA Standard RS-463 Type 2 requirements.
• Compliance and Standards: UL recognized and cUL approved for safety and performance in North American electrical systems.

Common Questions:

Can I use this MARS 11921 to replace a capacitor with a slightly lower MFD rating?
Technically, you should match the microfarad (MFD) range specified by the motor manufacturer. A 324-388 MFD rating is specifically calibrated for motors requiring high starting torque; using an incorrect rating can lead to overheating or failed startups.

Is the 110/125V rating compatible with standard 115V or 120V systems?
Yes, the 110/125V AC rating is designed for standard residential and commercial low-voltage circuits. As long as the system voltage does not exceed 125V, this capacitor will perform reliably.

Does it matter which wire goes to which terminal?
No, the MARS 11921 is a non-polarized (AC) electrolytic capacitor, meaning there is no positive or negative terminal. It features dual blade terminals for easy line connection regardless of orientation.

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.