Electric Compressor Motor Pump Capacitor

Motor Start Capacitors are used to boost the starting torque of single-phase electric motors by increasing the current through the start windings during startup. They typically only stay in the circuit for a few seconds before being switched off by a centrifugal or electronic switch inside the motor. If your single-phase motor will not start, very often, the start capacitor (if it has one), could be bad. It is a common failure mode in single phase motors.
A single phase motor will usually have both starting capacitors and run capacitors. Run capacitors have a smaller capacitance rating than a starting capacitor and are designed for continuous duty operation because they stay in the circuit all the time. It is important to never use a start capacitor as a replacement for a run capacitor because start capacitors are not designed for continuous duty.

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Capacitors