The NC7 series AC contactor
(hereinafter referred to as“contractor”) is mainly used in the circuit with
an alternating current of 50Hz (or 60Hz), rated operational voltage up to
690V, and rated operational current up to 620A under the usage category of AC-3/400V; this contact is mainly used for remotely closing and breaking circuits, and can be combined with an appropriate thermal overload relay to form a electromagnetic starter so as to protect the circuits likely to be overloaded in operation; the contact is well suited for
frequently starting and controlling AC motors.