ABB微型断路器多作为配电系统的主开关

ABB miniature circuit breaker is often used as the main switch of distribution system

框架断路器一般也被称作开启式断路器或者万能式断路器，有手操作，械杆操动，储能式，非储能式以及电动式等操作形式。按安装方式可分为固定式和抽屉式两种，固定式外壳采用金属材料，外型尺寸较大，防护等级较低。抽屉式则采用工程塑料外壳，结构较为紧凑，防护等级高，检修方便。按保护特性分，框架断路器可分为非选择性（A类）和选择性（B类），B类断路器多采用电子式过电流脱扣器，具有长延时，短延时和瞬时动作保护三段保护特性。智能型框架断路器内置单片机，具有显示，报警，自检和通信功能。

Frame circuit breaker is also generally called open circuit breaker or universal circuit breaker. It has manual operation, mechanical rod operation, energy storage type, non energy storage type and electric type. According to the installation mode, it can be divided into fixed type and drawer type. The fixed shell is made of metal material, with large external size and low protection grade. The drawer type adopts engineering plastic shell, which has compact structure, high protection level and convenient maintenance. According to the protection characteristics, the frame circuit breaker can be divided into non selective (Class A) and selective (class B). Class B circuit breaker mostly adopts electronic overcurrent release, which has three protection characteristics of long time delay, short time delay and instantaneous action protection. The intelligent frame circuit breaker has built-in single chip microcomputer and has the functions of display, alarm, self inspection and communication.

可与工控机组成监控系统，框架断路器的最大特点是容量大，极限分段能力高和足够的短时耐受电流，如DW17型断路器的额定电流高达5000A，额定短时耐受电流高达100KA，这使得框架断路器有很好的选择性和稳定性。

It can form a monitoring system with industrial computer. The biggest characteristics of frame circuit breaker are large capacity, high limit segmentation capacity and sufficient short-time withstand current. For example, the rated current of dw17 circuit breaker is up to 5000A and the rated short-time withstand current is up to 100kA, which makes the frame circuit breaker have good selectivity and stability.

正是由于这些优秀的特点，使得框架断路器的价格较高，多用于低压配电系统的主开关，以及重要的，负载较大的主干线和大型电动机的保护。

It is precisely because of these excellent characteristics that the price of frame circuit breaker is high. It is mostly used for the main switch of low-voltage distribution system, as well as the protection of important trunk lines and large motors with large load.

塑壳断路器也被成为装置式断路器，所有的零件都密封于外壳中，辅助触点，欠电压脱扣器以及分励脱扣器等多采用模块化。由于结构非常紧凑，塑壳断路器基本无法检修。其多采用手动操作，大容量可选择电动分合。由于电子式过电流脱扣器的应用，塑壳断路器也可分为A类和B类两种，B类具有良好的三段保护特性，但由于价格因素，采用电磁式脱扣器的A类产品的市场占有率更高。

Molded case circuit breaker is also called device circuit breaker. All parts are sealed in the shell. Auxiliary contacts, undervoltage release and shunt release are mostly modular. Due to the very compact structure, the molded case circuit breaker can hardly be overhauled. Most of them adopt manual operation, and electric opening and closing can be selected for large capacity. Due to the application of electronic over-current release, molded case circuit breaker can also be divided into class A and class B. class B has good three-stage protection characteristics, but due to price factors, class a products using electromagnetic release have a higher market share.

塑壳断路器的特点是体积小，接触防护好，安装适用方便且价格便宜。但与框架断路器相比，其容量小，短路分段能力低，选择性和耐受能路差，智能化方面也略显不足。虽然近年来，新型的塑壳断路器容量已经做到了很高，但由于结构上的不足，短时耐受能力依然无法得到大幅改善，选择塑壳断路器时必须注意这个问题。

Molded case circuit breaker is characterized by small volume, good contact protection, convenient installation and low price. However, compared with frame circuit breaker, it has small capacity, low short-circuit segmentation capacity, poor selectivity and withstand energy, and slightly insufficient intelligence. Although the capacity of the new molded case circuit breaker has been very high in recent years, due to the lack of structure, the short-term withstand capacity can not be greatly improved. We must pay attention to this problem when selecting the molded case circuit breaker.

以上就是三位工程师的对两类断路器的看法，我也稍微说下自己的看法，当然和工程师相比还是有很大差距的。我觉得无论是选择框架断路器，还是塑壳断路器，主要是要结合自身的情况，比方说要操作检修方便，分段能力高，那显然框架断路器更合适。而如果是用于额定电流比较低，同时希望预算比较低时，塑壳断路器则显得更加合适！

The above is the views of the three engineers on the two types of circuit breakers. I will also say my own views a little. Of course, there is still a big gap compared with the engineers. I think whether frame circuit breaker or molded case circuit breaker is selected, it is mainly based on its own situation. For example, it is necessary to have convenient operation and maintenance and high sectioning capacity. Obviously, frame circuit breaker is more suitable. If it is used for low rated current and low budget, the molded case circuit breaker is more suitable!