CJ20 AC contactor (hereinafter referred to as contactor) is mainly used in circuits of AC 50Hz (or 60Hz), and rated voltage up to 660V, and rated operating current up to 630A, for long-distance switching on/off the circuits, and it can be used with appropriate thermal overload relay in a combined way, in order to protect circuits that may subject to operating overload. 

Standard: IEC 60947-4-1.