Collection: Motor Start Capacitors

It gives a single-phase motor a high-torque boost to get moving from standstill, then disconnects once the motor reaches speed. It's vital for pumps and compressors with heavy startup loads.

Match the µF value (or specified range) and use equal or higher voltage than the original. Check the old capacitor or motor data plate. Browse the full Motor Capacitors range to compare options.

No. Start capacitors are designed for short bursts and will overheat if left in circuit continuously. Use a run capacitor for continuous operation, see Motor Run Capacitors and Capacitors.

A common cause is a failed start capacitor that no longer provides startup torque. Check for a bulging or leaking body and replace with the correct rating. Verify wiring and the switch with help from Tools.

Yes, they usually rely on a centrifugal switch or potential relay to disconnect them once the motor is up to speed. Leaving one connected continuously will cause it to overheat and fail.

Use a voltage rating equal to or higher than the original capacitor, never lower. The µF value must match the motor's requirement. Confirm against the part you're replacing or the motor plate.

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