Molded case circuit breaker is an electrical equipment that can automatically cut off the current after the current exceeds the trip setting. Plastic shell refers to the use of plastic insulator as the shell of equipment to isolate the parts between conductors and grounding metal. Molded case circuit breakers will contain thermal magnetic trip units, and large models of circuit breakers will be equipped with Solid-state trip sensors. The rated current of common circuit breakers are as follows: 60, 75, 80 / 100 / 126 / 160 / 200A, etc.

在使用断路器时，经常会遇到接触器和断路器线接好了却不通电，在没有测试的情况下拿去用，就会导致电路出现故障。很多人都怀疑这样的原因是产品出了问题，其实是因为我们在接线的方式上出了问题，导致产品缺相或产生了相间短路的情况。下面跟大家介绍一下正确的接线方式。

When using the circuit breaker, it is often encountered that the contactor and circuit breaker wires are connected but not energized. If they are used without testing, the circuit will fail. Many people suspect that the reason is that there is a problem with the product. In fact, there is a problem with our wiring method, resulting in phase loss or phase-to-phase short circuit. Let's introduce the correct wiring mode.

1、引线

1. Lead

要避免这样的情况发生，，我们在接线前要选择合适的引线，使用单股铜线，如果没有，使用多股软铜线，用锡将线头焊接在一起，形成单股线。这样做的目的就是防止多股铜线漏出产生短路状况。

To avoid such a situation, first of all, we should select appropriate leads and use single strand copper wire before wiring. If not, use multiple strands of soft copper wire and solder the wire ends together with tin to form a single strand wire. The purpose of this is to prevent the leakage of multiple strands of copper wires from causing short circuit.

2、接线方式

2. Wiring mode

接线方式都采用线框方式接线，这样做的好处是先不会像用1字型接线方式那样会产生内部触头发生侧滑，如果直接压在接线框的旁边，在拧紧螺丝的时候就容易造成静触点位移，导致断路器接触不良。

The wiring mode adopts wireframe wiring. The advantage of this is that the internal contact will not slip like the 1-shaped wiring mode. If it is directly pressed next to the wiring frame, it is easy to cause the displacement of the static contact when tightening the screws, resulting in poor contact of the circuit breaker.

3、螺丝选择

3. Screw selection

接触器采用螺丝帽压片压线，螺丝压片都是^型的，做成这样的原因是当螺丝往下拧的时候压片就会向下压紧引线，也会让产品在接线的时候有一个平衡点，接线也不会出现压不紧的情况，降低了故障率。

The contactor adopts screw cap pressing plate to press the wire. The screw pressing plate is of ^ type. The reason for this is that when the screw is screwed down, the pressing plate will press the lead downward, which will also give the product a balance point during wiring, and the wiring will not be too tight, reducing the failure rate.