FY-1I2X4三相电流表 FY-1U2X4三相电压表46槽形 FY-1I4X1交流电流表FY-2I4X1直流电流表 FY-1U4X1交流电压表 FY-2U4X1直流电压表FY-1I4X5三相电流表FY-1U4X5三相电压表 FY-1P4X1三相有功功率表 FY-1Q4X1三相无功功率表 FY-1H4X1功率因数表FY-1F4X1频率表5槽形 FY-1I5X1交流电流表FY-2I5X1直流电流表