Looking for a capacitor - Page 1
Forum section: electronics / repair

author: Magnum
author_rank: Regular Contributor
timestamp: March 17, 2024, 07:21:16 pm
content: Hello,I am looking for a capacitor, I think the english word is safety or suppression capacitor.It is from a heater controller between mains. It blew up, I removed it and now the controller works again.Unfortunately I can't find it online, can someone tell me what I could use instead? It seems to be 5nF Y1?Many thanks!

author: fzabkar
author_rank: Super Contributor
timestamp: March 17, 2024, 07:42:55 pm
content: This document has marking information for a different safety capacitor:https://datasheet.octopart.com/CS13-E2GA332MYNS-TDK-datasheet-12535414.pdfhttps://nfor.nl/images/uploaded/2022111618124863752820b8bfc.jpgBS415 is a UK standard:https://www.farnell.com/datasheets/103697.pdf

author: TimFox
author_rank: Super Contributor
timestamp: March 17, 2024, 07:43:39 pm
content: See, for example, from US Mouser search:https://www.mouser.com/c/passive-components/capacitors/safety-capacitors/?capacitance=4700%20pF~~5600%20pF&safety%20rating=Y1&rp=passive-components%2Fcapacitors%2Fsafety-capacitors%7C~CapacitanceThe difference between 4.7, 5, and 5.6 nF is not important.

author: Magnum
author_rank: Regular Contributor
timestamp: March 17, 2024, 07:52:41 pm
content: Thank you for your help.In Germany I found this one, does it matter if it is Y1 or Y2?https://www.pollin.de/p/entstoerkondensator-4-7-nf-250-v-rm-10-y2-200693

author: Magnum
author_rank: Regular Contributor
timestamp: March 17, 2024, 07:53:39 pm
content: Ok, I found the explanation for Y1 and Y2. IMHO Y2 should also be fine...

author: Gyro
author_rank: Super Contributor
timestamp: March 17, 2024, 08:47:24 pm
content: That should never happen with a Y cap. It is there to provide interference suppression but safe isolation between primary (mains) and secondary sides, or primary and ground. Y1 capacitors have a test voltage of 8kV and Y2, 5kV. What happened? Nearby lightning strike?

author: fzabkar
author_rank: Super Contributor
timestamp: March 17, 2024, 08:54:21 pm
content: QuoteIf the capacitor is connected from line to line, then it's an X class capacitor, not Y class.That said, your chosen replacement appears to be X1/Y2 rated.

author: Zero999
author_rank: Super Contributor
timestamp: March 17, 2024, 09:12:54 pm
content: Does the rest of the circuit work? Assuming it's not a fake Y capacitor, then I would expect other parts to be badly damaged it replacing it will not fix it.

author: Magnum
author_rank: Regular Contributor
timestamp: March 20, 2024, 06:24:03 pm
content: Sorry for the late reply.The rest of the circuit works after I removed the capacitor. I don't know what happened as no-one was at home when it blew.The one I ordered is a Y2, I have to recheck if it connects between mains or to ground.Thank you for all your help and information!

author: gamalot
author_rank: Super Contributor
timestamp: March 21, 2024, 07:28:30 am
content: It's a Vishay capacitor.https://richelectronics.co.uk/product/vishay-wyo103mcmcf0k-10000pf-250-440vac-ceramic-disc-x1-y2-3-4-5-pieces-mbf003n

author: Magnum
author_rank: Regular Contributor
timestamp: March 21, 2024, 10:09:45 am
content: Thank you!