A start capacitor refers to an electrical capacitor designed to alter current amounts that are sent to windings in an electric motor to create a rotating magnetic field. A start capacitor can overheat and suffer damage due to a number of causes.
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Start capacitors work at voltage classifications that typically range from 370 to 440 V (volts). A sudden surge of voltage, called overvoltage, can cause a build-up of pressure in the sealed aluminium that makes up the outer casing of the capacitor, which can lead to overheating damage to the capacitor's internal parts and possibly cause the capacitor to explode.
As relays open and close, electric sparks, called arcs, can cause the contacts to stick together. A sticking relay forces the capacitor to stay in the circuit for a longer period of time. The excess build-up of electricity can ultimately cause the capacitor to overheat.
Compressors, or mechanical devices that compress gas, can run in rapid cycles that may cause a capacitor to overheat. Start capacitors that cycle above 20 starts, or cycles per hour, may be subject to overheating.
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