MARS 11913 Start Capacitor

For service technicians handling single-phase compressor troubleshooting, the MARS 11913 is a critical 110/125V start capacitor designed for high-torque applications. This 145-175 microfarad electrolytic capacitor provides the necessary phase shift to overcome high head pressures in refrigerant circuits, particularly in systems utilizing non-bleed TXVs or where low-voltage starting is problematic. Built with a hermetically sealed black Bakelite case, this round start capacitor is resilient against persistent oil and moisture exposure common in condensing units. With a temperature rating of -40°C to +65°C and dual-frequency 50/60 Hz compatibility, it is an essential component for residential condenser motor repair and HVAC compressor troubleshooting. This MARS motor start capacitor features improved terminals to dissipate thermal energy efficiently during its momentary operational cycle, ensuring the compressor reaches 75% of full rotational speed before the potential relay cycles it out of the circuit.

• Designed for high-torque starting in compressors and electric motors requiring 145-175 MFD capacitance.
• Rugged phenolic case material provides superior protection against environmental grease and dirt.
• Compact 2-3/4" height and 1-7/16" diameter dimensions ensure universal capacitor replacement in tight control boxes.
• Constructed for up to 60 starts per hour, meeting high-performance HVAC part specifications.
• UL and CUL safety certifications for verified compliance in professional air conditioning maintenance.

Can I use this 125V capacitor on a 240V motor?
No. In HVAC capacitor voltage ratings, you may use a higher voltage rating than the original, but never lower. For 240V systems, you must use a capacitor rated for 250V or higher.

Why does this capacitor have a range (145-175 MFD) instead of one number?
Unlike run capacitors, start capacitors are rated in a microfarad range. This allows the component to provide sufficient starting torque across varying load conditions for single-phase induction motors.

What is the difference between a start and run capacitor?
A start capacitor is designed for momentary use to initiate motor rotation. It stays in the circuit for roughly 1/4 second. Run capacitors are designed for continuous duty to optimize efficiency while the motor is in operation.

This item is not eligible for free shipping.

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.