A start capacitor stays in the circuit long enough to rapidly bring the motor up to a predetermined speed, which is usually about 75% of the full speed, and is then taken out of the circuit, often by a centrifugal switch that releases at that speed. Afterward the motor works more efficiently with a run capacitor which makes the power factor ...

Start capacitors work with motor designs designated as capacitor-start or capacitor-start/run, and they are typically used with motors that power fans, blowers, and pumps. These motor start capacitors come with a resistor, also known as a bleeder, that …

A start capacitor is used to briefly shift phase on a start winding in a single phase electric motor to create an increase in torque. Start capacitors possess a very large capacitance value for their size and voltage rating.

Motor start capacitors are used during the motor startup phase and are disconnected from the circuit once the rotor reaches a predetermined speed, which is usually about 75% of the maximum speed for that motor type. These capacitors usually have capacitance values of over 70 µF.

Electric Motor Electrolytic Premium Start Capacitors momentary boost the start winding. They are designed to briefly increase motor starting torque to rapidly bring the motor up to a predetermined speed, which is usually about 75% of the rated full speed.

This article explains how to select an electric motor start capacitor, hard start capacitor, or run capacitor that is properly rated for and matches the requirements of the electric motor such as an AC compressor motor or fan motor where the capacitor is to be installed.

Seentech 124-149 uf/MFD 110-125 VAC ±20% Round Motor Start Capacitor 50/60 Hz AC Electric Universal Fit for AC Motor Run or Fan Start and Cool or Heat Pump Air Conditioner