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The circuit breaker refuses to break may have the following kinds of faults.
1．Button failure
Mechanical failure of the button or poor contact with the wire contacts will make the tripping circuit does not work, resulting in no power to the shunt tripping coil, no armature can be sucked, no circuit breaker can be broken. Alternative button switches can be optional.

2．Fault of shunt tripper
Open circuit or short circuit of the shunt excitation decoupling coil, and the existence of obstacles to the armature suction, etc., will affect the trip of the circuit breaker. Therefore, we should regularly check the shunt trip, remove the obstacles affecting the armature suction, and replace the open or shorted coil in time to ensure that the circuit breaker can be quickly broken when the circuit needs to be opened.

3．Fault of free tripping mechanism
The contact surface of the tripping half-shaft of the free tripping mechanism and the tripper is too large (generally 2~3 mm2), which will make the circuit breaker refuse to break, so the use of adjusting screws to make the tripping half-shaft rotate a certain angle to reach the requirement of 2~3 mm2 contact surface, and coating the contact surface with low-temperature extreme pressure grease to reduce friction will facilitate tripping.

智能控制器发生故障后，一般会出现手动可合闸，电动不能合闸，三段保护功能及其它保护功能失灵现象。智能控制器故障一般是由于电压过高造成烧毁，一般厂家按照国家有关标准，额定工作电压按照400V的标准设计，但实际运行中，到了后半夜用电量下降时，如变压器未做调压处理，电压往往会达到420V及以上，很容量使智能控制器因高电压而烧毁。

控制器另外一个常见问题是故障记忆如果得不到及时清除，即使电网故障已排除解决，断路器仍认为电网有故障而手动和电动均会合不上闸。此时只能按照使用说明书上的操作，清除故障记忆后复位，方可正常工作。一般人员不会想到是因为这个合不上闸，往往查不出故障原因，或者知道了这个原因，但因清除操作过于复杂而只能找专业技术人员，带来不必要的停电。解决的方法是厂家应开发出操作更简单直观的耐压性能更好的控制器，同时加强操作人员的技术培训。

可能出现部位：

1.运输原因造成自动转换电器断路器 脱扣

2.使用中造成自动转换电器的断路器脱扣

可能出现部位：
1.自动转换开关未置自动位置
2.自动转换开关延时调整过长

解决方法：
1.自动转换开关自动/手动切换开关处在手动位置，同时B型控制器自动切换灯不在自动位置

2.自动转换开关置在自投不自复或互为备用状态下。不能备用回路转为主用回路，如需改为自投自复状态时重新调整拨码开关及控制器设置

3.自动转换电器切换延时被调整，重新调整延时拨码开关及控制器的设置