![]() ![]() The capacitance and voltage ratings would have to match the original start capacitor specification. In unusual circumstances, a run capacitor could be used as a start capacitor, but the values available are much lower than the values usually available for dedicated start capacitors. They are generally of a much lower capacitance value.Īre start and run capacitors interchangeable? Run capacitors are used for continuous voltage and current control to a motor's windings and are therefore continuous duty. They are only intermittent duty and will fail catastrophically if energized too long. Start capacitors give a large capacitance value necessary for motor starting for a very short (seconds long) period of time. Because of this, start capacitors will fail after being left energized for too long due to a faulty starting circuit on a motor. As a result, they are only intended for intermittent duty. Start capacitors possess a very large capacitance value for their size and voltage rating. 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. ![]()
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