This product is suitable for using in circuit up to AC 660V or 440V and current 0. 1 to 16 Amprers. It can be used for protection of overload and shortcircuit of 3-phase squirrel-cage motors, and also starters of motors at full voltage. It is suitable to use for protecting the motor with undervoltage trip. It can also be used in operating A. C single phase load and D. C load. It can monitor the fuse of switch disconnector to act as protection of phase failure. This product includes basic type switch and 26 accessories with purposes of expanding usage. It complies with standards of JEC292-1, IEC157-1, VDE0660, etc.