JCZ7(CKG3, 4) Series AC Vacuum Contactor is applicable to 3~phase indoor electric system with AC 50Hz-60Hz, rated operation current 200A, 400A and 630A, JCZ7 (CKG3, 4) series AC vacuum contactor can be used for the electric equipment which need frequent operation, such as electric motor, transformer and capacitive load directly or remotely. This contactor can reach 6th rank as many as possible. In order to avoid positive an dnegative contactor closing at the same time, this series AC vacuum contactor can be equipped with mechanical interlocking device according to the user's equipment.