产品系数R.S.T三相电源相位检知工作电压范围:AC100~660V工作频率范围:45Hz~70Hz线路结构:电子式保险丝规格:250mA/250V相位检查后再接电,避免烧毁三相电源相位检查尺寸:100x50x25mmAC100-600V,50-70HZ