Packard PRMJ145 Start Capacitor

The Packard PRMJ145 is a professional-grade, dry electrolytic motor start capacitor designed for intermittent duty in AC motor starting circuits. Engineered with a capacitance range of 145-174 MFD and a voltage rating of 330V, this round start capacitor provides the necessary phase shift to initiate high-starting torque in HVAC compressor motors and pump applications. The unit is housed in a moisture and oil-resistant molded phenolic resin case, ensuring durability in demanding environments. Featuring standard dual blade terminals (1/4" male) and a 50/60 Hz frequency rating, it serves as a reliable field replacement for failed OEM start capacitors. Technical specifications include a diameter of 2-1/16 inches and a height of 4-3/8 inches. This Packard 330V start capacitor is UL and cUL recognized, rated for a 3-second start cycle with an operating temperature range of -40°C to 65°C, meeting EIA Standard RS-463 Type 2 requirements for precision performance in the field.

• High Starting Torque: The 145-174 microfarad range delivers the precise electrical boost required to overcome rotor inertia in heavy-duty compressors.
• Durable Construction: Molded phenolic resin housing protects the internal electrolytic film from oil, moisture, and common HVAC contaminants.
• Universal Terminal Fit: Standard 1/4 inch dual male blade terminals facilitate quick wiring and direct compatibility with existing bracketry.
• Broad Temperature Stability: Certified for operation from -40°F to 149°F, maintaining consistent discharge rates in extreme ambient conditions.

• Can I use a 330V capacitor to replace a 125V or 250V unit? Yes, the voltage rating on a start capacitor indicates the maximum dielectric strength. You can always use a higher voltage rating (330V) to replace a lower one, provided the MFD range matches.
• How do I confirm the PRMJ145 is the correct fit? Match the MFD range (145-174) and check physical dimensions (2-1/16" x 4-3/8") to ensure it fits the existing motor starting kit or mounting strap.
• What causes these capacitors to fail? Excessive heat, prolonged start cycles beyond 3 seconds, or faulty potential relays are common causes of swelling or terminal "blow-out" in electrolytic capacitors.

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