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XL-21 低压动力配电柜
          Low-voltage
          power distribution cabinet


          型号含义 / Model meaning

          X   L   21   □

                         方案号 Plan number
                         设计序号 Design Number
                         动力控 Power control
                         控制箱 Control box



          结构特征 / Structure

          XL-21 型低压动力配电柜系封闭式，外壳用钢板压制而成，刀开关操作手柄装于前右柱上部，可以作为切换电源之用。配电箱前面装有一只电压表，指示
          母线的电压。配电箱前面有门，门打开后配电箱内全部设备敞露、便于检修维护。本配电箱用用国内自行设计的型组件，具有结构紧凑，检修方便，线路方
          案可以灵活组合等特点。配电箱除装有空气断路器和熔断器作为短路保护外，还装有接触器和热继电器，箱前门可装操作按钮和指示灯。
          The XL-21 low-voltage power distribution cabinet is enclosed, and the outer casing is made of steel plate. The knife switch operating handle
          is mounted on the upper part of the front right column and can be used as a switching power source. A voltmeter is placed in front of the
          distribution box to indicate the voltage of the bus. There is a door in front of the distribution box. After the door is opened, all the equipment in
          the distribution box is exposed, which is convenient for maintenance and repair. The distribution box uses domestically designed components,
          which has the characteristics of compact structure, convenient maintenance and flexible combination of line schemes. In addition to the air
          circuit breaker and fuses, the distribution box is equipped with a contactor and a thermal relay. The front door of the box can be equipped with
          operation buttons and indicator lights.



          主要技术参数 / The main technical parameters
          刀熔组合开关 / Knife fusion switch

           型号 Model            额定电流 Rated current（A)      熔体额定电流 Melt rated current（A)         备注 Remarks
                                                                                              装隔离刀片时无溶体
           HR3-630/34                  630             150、200、250、300、350、400、500/630     No solution when installing
                                                                                              the isolation blade

          空气断路器 / Air circuit breaker
           型号 Model            额定电流 Rated current（A)   脱扣器整定电流 Trip unit setting current（A)    备注 Remarks
           MLM5-40/390                  40                     10、15、20、30、40
           MLM1-630/3300               630                   100、225、400、500、630

           MLM1-630/3300               630                100、250、315、400、500、630

          电流互感器 / Current Transformer
           型号 Model               初级电流 Primary current (A)     次级电流 Secondary current (A)      备注 Remarks

           LM-0.5                75、100、150、200、300、600                   5

          交流接触器 / AC contactor
           型号 Model                额定电流 Rated current（A)      吸引线圈电压 Attract coil voltage (V)  备注 Remarks
           MLC3-10                          10

           MLC3-20                          20                           交流
                                                                         AC
           MLC3-40                          40                           110
                                                                         220
           MLC3-80                         80                             380
           MLC3-150                        150

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