GXL-21A.C Iow-voltage motive power switch is suitable for textile，metallurgy,chemical industry，mine，machinery and other industry mining enterprise as motive and lighting distribution in A.C 50Hz，rated voltage 380V or 660V，rated current 630A 3-phase-3-wire，4-wire or 5-wire low-voltage distribution system. It also can be used as partly control in low-voltage controlling system.