I want to replace this MOV that has failed on a range hood after a surge. The MOV specs are 140V 175J. I have not found an MOV in DigiKey with the same specs. Is there another available that I could safely use?
I measured the diameter as 15.8mm
Welcome to the forum.
If possible keep the voltage rating the same and use a substitute with a different Joule rating.
A higher Joule rating will make the MOV last longer but at the expense of letting more surge through to the downstream electronics over time.
A lower Joule rating will make the MOV fail sooner but will let less surge through to the downstream electronics over time.
I currently don’t have time to lookup a substitute but I did locate a data sheet.
Hello Shellic123,
I believe you have the information on the markings incorrect.
This looks like 14K175, which would be 14mm inner disc, which would be about 16mm outside diameter. K=10%. 175 would be the AC voltage rating.
Looking at the link PaulHutch posted, it spells out the ratings for this part.
Click here for 495-4433-ND. This would be a very good match to those ratings.
If you can’t find the exact item, this should be a good alternate.
Please check the datasheet.
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Hello @Shellic123
Welcome to the TechForum
The part that PaulHutch had posted would be that part from the manufacturer, but we do not carry it.
I did find an alternative to that part in our system, and it is part number 495-1439-ND
| MFR PART # | B72214S2171K101 |
|---|---|
| DIGIKEY PART # | 495-1439-ND |
| MANUFACTURER | EPCOS - TDK Electronics |
| DESCRIPTION | VARISTOR 270V 6KA DISC 14MM |
| DATASHEET | Click Here |
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I’ll second the 495-1439-ND as it matches the higher max current and energy spec (6kA vs. 4.5kA and 70 joules vs. 43 joules, respectively) of your device. The other specs are about the same.
Edit: I just read @PaulHutch’s comments about joule ratings, and he’s brought in an interesting perspective that I had not thought about. Not sure what I think of it, but good food for thought.