I have a situation the other day, I have 2 motors that burnt out from single phasing. Also burnt out the contactor and overload. The overload that was in the circuit was an IEC brand adjustable current. I was told that IEC overloads will not open a power circuit when the contact is welded together. Will only open when normally closed so the contacts in the control circuit. And will not open the power circuit.
In my experience, every overload that I have ran into during single phasing the power and the control circuit will open and protect the motor. Is it true that IEC overloads that do not open a power circuit and cause the motor to burn out when you have a welded contact and do not open a power circuit during single phasing. What good are they if they do not open a power circuit?
can you please help or advise me on this? Thank you very much.
In my experience, every overload that I have ran into during single phasing the power and the control circuit will open and protect the motor. Is it true that IEC overloads that do not open a power circuit and cause the motor to burn out when you have a welded contact and do not open a power circuit during single phasing. What good are they if they do not open a power circuit?
can you please help or advise me on this? Thank you very much.