Collection: Motor Start Capacitors

A motor start capacitor is designed for short-duration, high-capacitance use during the start cycle only. Once the motor reaches operating speed, a centrifugal switch removes it from the circuit. A motor run capacitor, on the other hand, remains in the circuit continuously to improve efficiency and power factor during normal operation.

The required capacitance value (in µF) is usually printed on the motor's nameplate or listed in its technical datasheet. Always match the replacement capacitor to the original specification. If you are unsure, browse our full Motor Capacitors range or contact our support team for guidance.

No. Using a capacitor with a higher capacitance than specified can cause the motor to overheat, draw excessive current, and potentially fail prematurely. Always use the exact µF value recommended by the motor manufacturer. If you cannot locate the specification, consult the motor's documentation or contact a qualified electrician.

No. Motor start capacitors are designed specifically for single-phase induction motors. Three-phase motors do not require capacitors for starting because they generate a rotating magnetic field naturally from the three-phase supply. Using a capacitor on a three-phase motor would be incorrect and potentially damaging.

Common signs of a failed motor start capacitor include the motor humming but not starting, starting slowly or struggling under load, or the motor overheating shortly after startup. A swollen or leaking capacitor body is also a clear visual indicator. You can confirm failure with a capacitance meter. Browse our Motor Capacitors range to find a suitable replacement.

The voltage rating of the capacitor must be equal to or greater than the voltage of the motor's start winding circuit. Using an under-rated capacitor can lead to dielectric breakdown and failure. Always refer to the motor's nameplate or documentation for the correct voltage specification before selecting a replacement.

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