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Old 03-25-2017, 07:12 AM   #1
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Default TPMOV Surge Protection

Can anyone shed some light on TPMOV surge protection?

Most surge protectors use MOVs to shunt surges, the little surge strips use little MOVs, whole house surge protectors use bigger ones, but the idea is the same.

I was looking at the Supco site earlier and they have this surge protector made to go right at the condenser

http://lbk10.com

and it says it uses TPMOVs, which I don't think I ever heard of. So I search around a little and found this

Quote:
The Ferraz Shawmut Thermally Protected MOV has been developed to assist in minimizing the failure characteristics of Metal-Oxide-Varistors. The TPMOV is a completely fail-safe device.
http://www.ferrazshawmutsales.com/th..._mov_tpmov.htm

As far as the "failure characteristics" of MOVs, I assume they are talking about this kind of thing



where the MOV does it's job but gets blown to bits doing it, in a big surge the MOV is sacrificial. Leading me to think a metal case is one of my favorite features on a surge protection device.

So does anyone hear if these TPMOVs work as well, and do they blow without blowing up?
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Old 03-25-2017, 08:22 AM   #2
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Iy appears they are fused with a fast acting fuse?
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Old 03-25-2017, 09:11 AM   #3
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I'd guess there's a thermal trip that opens the circuit upon taking a hit so you know you need to replace it unlike any regular MOV that continues to complete the circuit upon most hits that don't reach the limit of the MOV.
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Old 03-25-2017, 09:18 AM   #4
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Here's the sheet from the Linebacker 10 that I saw it on:

http://lbk10.com/wp-content/uploads/...Comparison.pdf

Some of the models use TPMOV, others use MOV and a thermal fuse, and they claim the TPMOV is "proven to be superior" - but IDK.
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Old 03-25-2017, 10:34 AM   #5
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If what we are saying is correct, the MOV would have to be in series (or at least the interrupter) instead of parallel which is how it's normally done.
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Old 03-25-2017, 11:00 AM   #6
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I can't count the number of their older version I've installed to protect compressors. Unless it is a small spike and the device just goes into reset mode they are the sacrificial lamb.
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