1、 The open coil of MCCB is burnt out

1、开式电磁铁的机械故障。当线圈松动时，电磁铁铁芯在断路器断开时移动，铁芯卡住，线圈烧毁。还可能由于铁芯的主动行程较短，当开启电路的电源接通时，铁芯不会打开跳闸机构，使线圈长时间通电，造成燃烧。

1. Mechanical failure of open electromagnet. When the coil is loose, the electromagnet iron core moves when the circuit breaker is disconnected, the iron core is stuck, and the coil is burned. It is also possible that due to the short active stroke of the iron core, when the power to open the circuit is turned on, the iron core will not open the tripping mechanism, and the coil will be electrified for a long time, causing combustion.

2、死点调整不当，机构无法及时释放，导致线圈过载，使分闸线圈烧毁。

2. Improper adjustment of dead point makes the mechanism unable to release in time, resulting in overload of coil and burnout of opening coil.

3、辅助开关开路状态调整不当，档辅助开关超出了分闸状态的行程范围时，会导致辅助开关无 法 正常切换分闸回路，导致分闸线圈烧毁。

3. If the open circuit state of the auxiliary switch is not adjusted properly and the auxiliary switch is beyond the travel range of the opening state, the auxiliary switch will not be able to switch the opening circuit normally and the opening coil will be burned.

4、辅助开关触电使用不当。当断路器的合闸时间很短时，远远小于断路器的开启时间，断路器不及时，则断路器处于关闭位置。开关控制电路的延迟触点的延迟效应会消失，相反的，由于辅助开关的动、静触电绝缘间隙小，经常发生拉弧现象，烧坏辅助开关触点，造成线圈烧坏。

4. Improper use of auxiliary switch in case of electric shock. When the closing time of the circuit breaker is very short, far less than the opening time of the circuit breaker, and the circuit breaker is not in time, the circuit breaker is in the closed position. The delay effect of the delay contact of the switch control circuit will disappear. On the contrary, due to the small insulation gap between the dynamic and static electric shock of the auxiliary switch, the arcing phenomenon often occurs, which burns out the auxiliary switch contact and causes the coil to burn out.

5、当装置中的分流继电器发生故障，或者分流器的辅助开关触点有较大的以偶定，会导致分流器不能及时退出，分流器线圈会长时间通电，导致烧毁。

5. When the shunt relay in the device fails, or the auxiliary switch contact of the shunt has large coupling, the shunt can not exit in time, and the shunt coil will be energized for a long time, resulting in burnout.

6、当开关线圈的电路绝缘降低，或电路电阻过小时，会导致开关电路电压衰减，导致电压达不到线圈开关的电压值，导致开关线圈充电时间过长，烧毁线圈。

6. When the circuit insulation of the switch coil is reduced, or the circuit resistance is too small, the voltage of the switch circuit will be attenuated, resulting in the voltage not reaching the voltage value of the coil switch, resulting in the switch coil charging time is too long, and the coil will be burned.

二、塑壳断路器闭合线圈烧坏的原因

2、 The reason of closing coil burn out of moulded case circuit breaker

1、断路器本体的内导电杆由于断路器工作机构不匹配，传动连杆的阻塞不好，由于保护锁紧联锁机构操作不当，机构无法开启断路器，导致关闭线圈因合闸铁芯过载而烧毁。

1. Due to the mismatching of the working mechanism of the circuit breaker, the blocking of the transmission link is not good. Due to the improper operation of the protection locking interlock mechanism, the mechanism can not open the circuit breaker, resulting in the burnout of the closing coil due to the overload of the closing iron core.

2、当保护控制装置发出开启指令时，装置中的开关继电器发生故障或者闸门控制回路的辅助开关的操作行程大，就无法及时撤回开启指令，导致开关线圈被长时间充电并烧毁。

2. When the protection and control device sends the opening command, the switch relay in the device fails or the auxiliary switch of the gate control circuit has a large operation stroke, so the opening command cannot be withdrawn in time, resulting in the switch coil being charged and burned for a long time.

3、当断路器闭合时，由于闭合电流较大，控制回路不能直接控制闭合线圈，只能通过闭合接触器间接连接闭合线圈，当闭合接触器失效时，不能及时断开，导致闭合线圈开启时间过长，烧毁线圈。

3. When the circuit breaker is closed, due to the large closing current, the control circuit can not directly control the closing coil, and can only indirectly connect the closing coil through the closing contactor. When the closing contactor fails, it can not be disconnected in time, resulting in too long opening time of the closing coil and burning the coil.

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The above is the relevant content introduced by ABB MCCB agent. I hope it can help you. More wonderful contents can be paid attention to directly http://www.jntongyu.com .