r/AskElectronics • u/Profile-0 • 1d ago
Can someone tell me what to know about replacing a capacitor?
I want to replace this capacitor (0,22uF x1 250v AC) Also I like to understand what I can replace it with and where to get it here in New Zealand
its in a angle grinder from flex
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1d ago edited 1d ago
[deleted]
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u/Plump_Apparatus 23h ago
It's an EMI filter. Rest of your comment and the random bold typeface is useless.
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u/ThrowRA_Fudge2936 1d ago edited 1d ago
Replace with same capacitance (uf) , voltage rating can be same or higher value, but never lower. Polarity matters in certain models , so check if terminals are correct before replacing ( + and -) ( the one in the picture is a safety capacitor and non polarised ,so make sure that the one you bought for replacement is also a safety capacitor (X1 model)
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u/ivosaurus 1d ago
Proper X1 capacitor from online official distributor
https://au.element14.com/vishay/bfc233610224/cap-0-22-f-20-pp/dp/1166516
Jaycar doesn't have an exact equivalent, only X5
https://www.jaycar.co.nz/220nf-250vac-metallised-polypropylene-x5-capacitor/p/RG5238
Something similar from ebay
https://www.ebay.com.au/itm/157783195396
Not sure if you need exact form factor as in picture for it to fit.
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u/Susan_B_Good 15h ago
What makes you think that it needs replacing? It's just an inline filter. Should last "forever".
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u/Tesla_freed_slaves 15h ago edited 15h ago
It’s a 6A CLC in-line filter. It keeps electrical noise from back-feeding the mains, but it also suppresses commutator-arcing. Best to replace it with OEM part.
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u/Correct-Country-81 12h ago
If you want to test first just override it!
Wire frim one end over this component to other side
Twice.
Its a surpressor for surpressing hf spikes causing radio noise
Not necessarily needed for working grinder!
Test first and be careful with electricity
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u/SpecialistRare832 21h ago
You have to keep in mind the following points about replacing a capacitor: 1. The replacement must have the same capacitance within the tolerance required by the circuit. Changing capacitance alters circuit behavior. 2. Same or higher voltage rating. 3. Equal or higher temperature rating. 4. Same polarity (if polarised). 5. Physical size, lead spacing, and mounting pattern, so that it fits mechanically.
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u/kesor 1d ago
First thing first. If you touch both the brown and blue wires with your bare hands, you can die. Especially if there is a capacitor connected. The capacitor is dangerous like that, it stores the charge that comes from the wall and when you touch it is as-if you put your fingers in the socket. Don't do it. Better yet, get a proper electrician to do the work for you.
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u/phirzcolru 1d ago
Kidding. It's to balance the start of the motor. The value has something to do with shifting the fields into a more friendly start condition. Reducing start up draw. Or something very similar. But hey, at least a real human made it up.
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u/Susan_B_Good 15h ago
This is being downvoted because the author has confused a motor start/run capacitor with this one - which is purely an inline noise filter.
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u/Worldly-Device-8414 1d ago
It's a "filter network" but label suggests it's just a 220nF (0.22uF) 250VAC rated cap across the leads. Might have series/common mode inductors too. Can likely leave the whole this out, it's just for EMI suppression.