The frame circuit breaker is divided into fixed type and drawer type. Its structure is mainly composed of contact system, arc extinguishing system, operating mechanism, current transformer, intelligent controller and auxiliary switch, secondary connector, undervoltage and shunt release. The drawer seat is composed of left and right measuring plates with guide rails, bases and beams. The characteristics of the three main components are as follows:

(1)触头系统

(1) Contact system

其是采用一档触头触头系统，在同一触头的不同部位，触头单元既具有主触头的功能，也具有弧触头的功能，还采用了新型耐弧材料，使触头在分断路器电流后不致过分发热而引起温升过高。触头系统是多路并联的，能够降低电动斥力，提高触头系统的电动稳定性。

The first gear contact system is adopted. At different parts of the same contact, the contact unit not only has the function of main contact, but also has the function of arc contact. In addition, a new arc resistant material is adopted, so that the contact will not generate excessive heat and cause too high temperature rise after breaking the circuit breaker current. The contact system is multi-channel parallel, which can reduce the electric repulsion and improve the electric stability of the contact system.

(2)灭弧室

(2) Arc extinguishing chamber

每个极设有一个灭弧室，其作用是将各电极隔开，并相互绝缘，与断路器的其他部分及操作人员相隔离，灭弧室全部置于绝缘底座内，增加了灭弧室壁的机械强度，可以防止在分断大短路电流时炸裂。

Each pole is equipped with an arc extinguishing chamber, which is used to separate the electrodes and insulate them from each other and isolate them from other parts of the circuit breaker and operators. All the arc extinguishing chambers are placed in the insulating base, which increases the mechanical strength of the arc extinguishing chamber wall and can prevent cracking when breaking large short-circuit current.

(3)操作机构和手动、电动传动机构

(3) Operating mechanism and manual and electric transmission mechanism

机构位于框架断路器正面，操动机构采用五连杆的自由脱口机构，并设计成贮能形式。在使用过程中，机构总是处于预贮能位置，只要断路器一接到合闸命令，断路器就能立即瞬时闭合。预贮能的释放可用手动释能按钮或合闸电磁铁来完成。电动传动机构自成一体，贮能轴与主轴之间通过凹凸形契口活动联结，装拆方便。

The mechanism is located in the front of the frame circuit breaker. The operating mechanism adopts a five link free port mechanism and is designed as an energy storage form. During use, the mechanism is always in the pre stored energy position. As soon as the circuit breaker receives the closing command, the circuit breaker can be closed immediately and instantaneously. The release of pre stored energy can be completed by manual energy release button or closing electromagnet. The electric transmission mechanism is self-contained, and the energy storage shaft and the main shaft are movably connected through concave convex wedge, which is convenient for assembly and disassembly.