1. In terms of rated current, molded case circuit breakers are generally below 630A (some new products can reach 1600A), while the rated current of intelligent universal circuit breakers is much larger, generally 630a-6300a. In addition, the sectioning capacity of intelligent universal circuit breaker is higher than that of molded case circuit breaker. In practical application, intelligent universal circuit breaker should be used for circuits above 800A or circuits requiring particularly high sectioning capacity or circuits requiring more functions. Molded case circuit breaker is generally used for circuits below 630A.

2、塑壳式断路器产品种类繁多，其特点是结构紧凑，操作容易，功能比较简单，一般配置过流脱扣器和瞬时脱扣器，智能型式断路器则功能完善，特别是近年来单片机技术的应用，智能型式断路器向着高性能、易维护、网络化的方向发展。

2. There are many kinds of molded case circuit breaker products, which are characterized by compact structure, easy operation and simple function. Generally, it is equipped with overcurrent release and instantaneous release, while the intelligent universal circuit breaker has perfect function. Especially with the application of single chip microcomputer technology in recent years, the intelligent universal circuit breaker is developing in the direction of high performance, easy maintenance and networking.

3、塑壳式断路器、采用塑料化结构，特点是将断路器外壳、框架采用塑料压制而成，将触头、灭弧系统都放在绝缘小室中，防止相间短路，确保电弧向上喷出，保证触头系统可靠分断。而智能型式断路器采用模块化结构，分为框架、触头灭弧系统、手动操作机构、电动操作机构、智能型控制器以及抽屉座等部分。每个部分都成为一个完整独立的部件，组装时只需1-2个螺钉即可将其固定，拆装十分方便有利于检修维护。

3. The molded case circuit breaker adopts a plastic structure, which is characterized in that the shell and frame of the circuit breaker are made of plastic, and the contact and arc extinguishing system are placed in the insulating chamber to prevent phase to phase short circuit, ensure that the arc is ejected upward, and ensure the reliable breaking of the contact system. The intelligent universal circuit breaker adopts modular structure, which is divided into frame, contact arc extinguishing system, manual operation mechanism, electric operation mechanism, intelligent controller and drawer base. Each part becomes a complete and independent part, which can be fixed with only 1-2 screws during assembly. It is very convenient for disassembly and assembly, which is conducive to overhaul and maintenance.

4、智能型式断路器的所有零件都装在一个绝缘的金属框架内，常为开启式，可装设多种附件，更换触头和部件较为方便，多用在电源端总开关。过电流脱扣器有电磁式，电子式和智能式脱扣器等几种。断路器具有长延时、短延时、瞬时及接地故障四段保护，每种保护整定值均根据其壳架等级在一定范围内调整。手动及电动操作均有，随着微电子技术的发展，目前部分智能型断路器具有区域选择连锁功能，充分保证了动作的灵敏性和选择性。

4. All parts of the intelligent universal circuit breaker are installed in an insulated metal frame, which is usually open. It can be equipped with a variety of accessories. It is more convenient to replace contacts and components, and it is mostly used in the main switch at the power end. Over current release includes electromagnetic release, electronic release and intelligent release. The circuit breaker has four sections of protection: long time delay, short time delay, instantaneous and ground fault. The setting value of each protection is adjusted within a certain range according to its shell level. Both manual and electric operation. With the development of microelectronics technology, some intelligent circuit breakers have the function of regional selection and interlocking, which fully ensures the sensitivity and selectivity of action.

塑壳式断路器是接地线端子外触头、灭弧室、脱扣器和操作机构等都装在一个塑料外壳内，一般不考虑维修，适用于作支路的保护开关，过电流脱扣器有电磁式和电子式两种，一般电磁式塑壳式断路器为非选择性断路器，仅有长延时及瞬时两种保护方式，电子式塑壳式断路器有长延时、短延时、瞬时和接地故障四种保护功能。部分电子式塑壳式断路器新推出的产品还带有区域选择性连锁功能。大多数塑壳式断路器为手动操作，也有部分带电动机操作。

Molded case circuit breaker is that the outer contact of grounding wire terminal, arc extinguishing chamber, release and operating mechanism are all installed in a plastic shell. Generally, maintenance is not considered. It is suitable to be used as the protection switch of branch. There are two types of overcurrent release: electromagnetic type and electronic type. Generally, electromagnetic molded case circuit breaker is a non selective circuit breaker, with only two protection modes of long time delay and instantaneous, The electronic molded case circuit breaker has four protection functions: long time delay, short time delay, instantaneous and grounding fault. Some new products of electronic molded case circuit breakers also have regional selective interlocking function. Most molded case circuit breakers are operated manually, and some are operated with motors.