Aside from all the regulatory issues of leakage current and nasty failure modes of MOVs. What methods have been used to detect a failed transient suppression device in equipment? Or, is there some expectation the devices will survive a warranty period and that alone is good enough?
Seems like any detection schemes would also have a series of regulatory issues and be a significant cost adder to the product.
Hi Doug:
I think it's hard to adequately cover all the possible failure modes that can occur with an MOV.
I have seen some implementations include a series fuse that would help for certain failure modes. I also recently saw an advertisement for a device that packages an MOV with a series fuse that is thermally triggered.
My own approach to MOVs has been to avoid using them if possible, but I understand that there may be certain applications where MOVs are the best match for the application.
Telecom Design Consultant
Randolph Telecom, Inc.
781-721-2848 (USA)
[email protected]
http://www.randolph-telecom.com
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