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Albright Contactor Failure Modes

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Can anyone tell me the common failure modes for an Albright SW-200 with the auxiliary contacts? Aside from welding contacts,

Do the contacts ever get hung during switching? Keep them clean I suppose?

Do the auxiliary contacts ever get out of alignment such that a Zilla controller would not read them as active (or inactive)?

Thanks

Mike,
Anchorage, Ak.
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