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jraef, Please elaborate on /// In a panic mode he may have inadvertantly caused real damage to the contactor by opening the disconnect then reclosing it under load. \\\ My understanding of the circuit is that this is across the line starter. Disconnect feeds line power to m-contactor and...

Barry1961, Of course, the electricians claim they did everything perfectly well, too. And the manufacturers all supplied perfect equipment... I agree with the operator issue, but barring throwing the contactor in by using the manual handle, I'm not convinced that no matter what he does, should...

Looking for possible reasons why a single phase of the M-contactor in my fire pump controller burnt up. I would like to avoid the next $5,000 replacement if it fails again!!!! It is a 480v, 3ph, 200hp automatic pressure controlled application supplied by Joslyn Clark. Supposedly was wired and...