Packard PMJ540 Start Capacitor

The Packard PMJ540 Start Capacitor is a heavy-duty, dry electrolytic component designed for intermittent AC motor starting applications. Engineered for reliability in demanding HVACR environments, this 540-648 MFD 125V Round Start Capacitor provides the high torque necessary to engage compressors and fan motors rapidly. Encased in a moisture and oil-resistant molded phenolic resin, the PMJ540 is built to withstand operating temperatures from -40°C to 65°C. With a 110-125V rating and 50/60 Hz compatibility, this unit serves as a direct professional-grade replacement for industry standard 11026 and Supco CS540-648X110. Its round start capacitor profile features standard 1/4-inch dual male blade terminals for straightforward integration into existing wiring harnesses. Field-tested for up to 20 starts per hour with a 3-second start cycle, this Packard capacitor meets or exceeds EIA RS-463 Type 2 standards, ensuring stable performance across refrigeration and air conditioning systems.

• Broad Compatibility: Replaces common industry numbers including 11026, NTE MSC125V540, and Mars 11926.
• Rugged Construction: Phenolic resin housing protects internal electrolytic cells from environmental moisture and oil.
• Optimized Startup: Delivers precise 540-648 microfarad capacitance to ensure high-starting torque for sluggish compressors.
• Standardized Fit: 1-13/16 inch diameter and 3-3/8 inch to 4-3/8 inch height fits most standard motor capacitor brackets.
• Certified Safety: UL recognized and cUL approved for professional HVACR installations.

Can I use the PMJ540 to replace a 110V capacitor?
Yes, this unit is rated for 110-125V AC applications, making it suitable for any motor circuit within that voltage range provided the MFD matches.

What is the difference between this and a run capacitor?
The PMJ540 is a start-duty electrolytic capacitor intended for intermittent use (3-second starts). It should never be used as a continuous-run component.

How do I confirm this fits my motor?
Verify that your existing motor requires a 540-648 MFD range and that the physical clearance allows for a 1-13/16" diameter round casing.

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.