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Could someone please advise on how I interprate the codes on this Varistor below.. I'm almost there, I can find the S14 / K140 on RS Components, But im unsure about the last 4 digits. RS Website PN:2508485459 The part I have is numbered 0023 Im unsure what this stands for. I have heard that it may be the manufacturing date, in which case the one I have found will be the correct item. I just want to be sure it isnt another rating variable of some kind.

The Varistor is from a 110v Honeywell DKO 972 Flame Control unit from an EOGB X500 oil Burner.

Could someone just give me the nod as to if I have found the correct part and that I only need the S14 K140 part of the code. Thanks in advance. Roy

S14 K140

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2 Answers 2

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Here's one from EPCOS: -

enter image description here

It's an S14K140 and it has the extra codes as 0345 and that means it was made in the 45th week of 2003. Does that convince you? Here's one made in 1998: -

enter image description here

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  • \$\begingroup\$ Thank You @Andy aka I know i'm on the right track now. \$\endgroup\$
    – RoyBolas
    Feb 3, 2021 at 19:48
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S14 means the disk diameter 14mm K140 means the operating voltage 140 VAC

so a S20K275 is a 20mm disk with an operating voltage of 275 VAC

Always overate a varistor voltage by 20%

the disk goes up with its max pulse power

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