Motor run capacitors are used in pumps, fans, washing machines, tumble dryers, pressure washers, macerators, cooker hoods and compressors. When one fails the motor usually hums but won’t start, or runs weakly. Replacing it is often a quick and cheap fix – as long as you choose the right one.
1. Match the uF value exactly
The most important number is the capacitance, shown in uF (microfarads) – sometimes written µF or MFD. If your old capacitor says 10uF, you need a 10uF replacement. A different value can make the motor run badly or overheat.
2. Use the same or a higher voltage
The voltage rating (for example 250V, 450V or 475V) is the most the capacitor can safely handle. A replacement with the same or higher voltage is fine – a 450V capacitor can replace a 400V one. Never fit a lower voltage than the original.
3. Pick the right connection
- Tag spade – flat metal terminals that the wires push onto. See Ducati tag spade capacitors.
- Twin lead – two wires coming out of the capacitor. See Ducati twin lead capacitors.
- Metal or plastic case – both work the same; check there’s room for the size in your appliance.
4. Check the size fits
Each of our listings gives the length and diameter. Make sure the new capacitor fits the clip or space where the old one sat.
What if my brand is no longer made?
ItalFarad, Comar and Icar capacitors are no longer made. A universal (CBB60) capacitor or a Ducati capacitor with the same uF value and the same or higher voltage will normally replace them.
Safety
Always disconnect the appliance from the mains before working on it. Capacitors can hold a charge, so don’t touch the terminals. If in doubt, ask a qualified electrician or repairer.
Still not sure? Email us a photo of your old capacitor and we’ll find the match. Fast tracked UK delivery.
Tumble dryer humming but not turning? See: How to tell if the capacitor has failed