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Is there any requirement to put a main contactor in series before the softstarter?

April 26, 2017contactor main requirement SERIES softstarter

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Is there any requirement to put a main contactor in series before the softstarter?

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A. The softstarter does not require a main contactor but ABB recommends the use of one for emergency stop and/or trip of the overload relay. In some applications an MCCB can be used instead of the main contactor.