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A Start Capacitor (usually round and phenolic plastic) is used to give the motor in any instance washer, dryer, blower... more torque when starting. After the motor gets to a preselected (by the manufacturers engineers) RPM (or in some cases the amp draw deminishes, or the voltage back emf is raised) this type of cap[icator is taken out of the circuit by a centrifugal switch (or in the case of the other types by a current or voltage - potential relay)
A run capacitor is generally metallic but can also be plastic of various types. A run capacitor is in the motor circuit at all times and is wound to allow voltage to step up and current to step down by virtue of its resistance, and capacitance.
Both types of motors are rated in Micro-Farads. And the symbol is usually the Greek letter resembling a u followed by FD - UFD or MFD. Start capacitors in the appliance industry in USA are 88 MFD and up and run capacitors are usually 80 MFD and down.
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