一、低压断路器的工作原理；低压断路器又称自动开关，它是一种既有手动开关作用，又能自动进行失压、欠压、过载、和短路保护的电器。它可用来分配电能，不频繁地启动异步电动机，对电源线路及电动机等实行保护，当它们发生严重的过载或者短路及欠压等故障时能自动切断电路。 

二、LS低压断路器选择

三、低压断路器符号，LS低压断路器选型: 

经济型ABE52b,ABE804b 

标准型ABS33b,ABS1203 

高分断型ABH103b,ABH404b 

限流型：ABL402b,ABL804b 

马达保护型：ABE53bM,ABS33bM,ABH53bM 

四、LS低压断路器规格：从极数分2极、3极、4极；额定电流从5A、10A*大到1200A; 

五、低压断路器特点： 

1、设计着眼于基本功能，经济适用 

2、触点采用银合金材料 

3、产品分类详细，想客户所想 

4、产品附件齐全 

5、外壳采用高绝缘、高阻燃、高强度工程塑料制成。 

六、LS低压断路器参数: 

产  品 型  号 分断能力lcu KA/AC380V 额 定 电 流In          极  数 

ABE52b        7.5                 5,10,15,20,30,40,50A                      2P 

ABE53b                                                                       3P 

ABE62b         7.5                     60A                                   2P 

ABE63b                                                                       3P 

ABE102b      14                5,10,15,20,30,40,50,60,75,100A               2P 

ABE103b                                                                   3P 

ABE104b                                                                   4P 

ABE202b      18                100,125,150,175,200,225A                   2P 

ABE203b                                                                  3P 

ABE204b                                                                  4P 

ABE402b      30                   250,300,350,400A                       2P 

ABE403b                                                                  3P 

ABE404b                                                                  4P 

ABE602b      42                         500,600A                        2P 

ABE603b                                                                  3P 

ABE604b                                                                  4P 

ABE802b       42                       700,800A                          2P 

ABE803b                                                                  3P 

ABE804b                                                                  4P 

AB系列  （标准型） 

ABS32b           7.5                  5,10,15,20,30A                      2P 

ABS33b                                                                     3P 

ABS52b            14              5,10,15,20,30,40,50A                     2P 

ABS53b                                                                     3P 

ABS54b                                                                     4P 

ABS62b            14                      60A                              2P 

ABS63b                                                                     3P 

ABS64b                                                                     4P 

ABS102b          25      5,10,15,20,30,40,50,60,75,100A                    2P 

ABS103b                                                                    3P 

ABS104b                                                                    4P 

ABS202b             25         100,125,150,175,200,225A                    2P 

ABS203b                                                                    3P 

ABS204b                                                                    4P 

ABS402b             42             250,300,350,400A                        2P 

ABS403b                                                                    3P 

ABS404b                                                                    4P 

ABS602b             65                 500,600A                            2P 

ABS603b                                                                    3P 

ABS604b                                                                    4P 

ABS802b              65                   700,800A                         2P 

ABS803b                                                                    3P 

ABS804b                                                                    4P 

ABS1003              65                      1000A                         3P 

ABS1004                                                                    4P 

ABS1203             65                      1200A                          3P 

ABS1204                                                                    4P