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Author Topic: NTC identification  (Read 484 times)

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Offline laban93Topic starter

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NTC identification
« on: April 20, 2022, 12:29:26 pm »
Hey!
At work our UPS transformer module died, and as there are no replacement parts for it, i had a look myself. I found the pcb inside to be faulty as it had a blown NTC. Its inline after the rectifier and fuse for the control circuits wich monitors current and temperature. The issue is that the number is gone, only 632 is visible. I have a sck 055 NTC for replacement if that is possible? As i understand, the NTC is there mostly for IEC compliance anyway?  :-//
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Offline TheMG

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Re: NTC identification
« Reply #1 on: April 20, 2022, 02:54:59 pm »
The exact value isn't too critical, it's there to reduce the inrush current on power-up. As long as it is rated for a sufficiently high steady-state current for the application but don't go too crazy big either.

I would also check that the circuitry downstream of the NTC doesn't have any obvious shorts before powering up.
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Offline fzabkar

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Re: NTC identification
« Reply #2 on: April 20, 2022, 06:57:03 pm »
Could "632" be a YWW date code?
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Offline PKTKS

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Re: NTC identification
« Reply #3 on: April 21, 2022, 07:57:58 am »
Up to 2kva NTC 5D 25 should fit...

https://a.aliexpress.com/_mLaGwAK

Paul
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