From the perspective of structure and working principle, we can see the difference between MCCB and MCB. The action sensitivity of MCB is higher than that of MCCB. From the perspective of purchase, there are five differences between MCCB and MCB. I hope it can help you.

1、塑壳断路器对过流和短路采用两套装置分别保护，过流保护动作值可以人工调整。小型断路器对过流和短路共用一套装置，电流不可调。

1. Moulded case circuit breaker adopts two sets of devices to protect over-current and short circuit respectively, and the action value of over-current protection can be adjusted manually. Miniature circuit breakers share a set of devices for over-current and short circuit, and the current is not adjustable.

2、塑壳断路器能接入较粗导线，如35平方以上的。小型断路器只适合接10平方以下的导线。

2. Moulded case circuit breaker can be connected with thicker conductor, such as 35 square meters or more. Miniature circuit breakers are only suitable for connecting wires less than 10 square meters.

3、小型断路器动作灵敏度比塑壳断路器高。

3. The sensitivity of miniature circuit breaker is higher than that of moulded case circuit breaker.

4、塑壳断路器端头用螺母联接，容易压紧，接触良好。小型断路器采用较小的压紧端子，且只能用螺丝刀拧紧，力矩不够，不容易压紧，接触不太好。

4. The end of MCCB is connected with nut, which is easy to press and has good contact. The miniature circuit breaker adopts a smaller pressing terminal, and can only be tightened with a screw driver. The torque is not enough, it is not easy to press, and the contact is not good.

5、塑壳断路器相间距离大，且有灭弧罩，灭弧能力强，能承受更大的短路电流，还不易引发相间短路。寿命也长。

5. The molded case circuit breaker has large phase to phase distance and arc extinguishing cover, which has strong arc extinguishing ability, can withstand larger short circuit current, and is not easy to cause phase to phase short circuit. It has a long life.

塑壳断路器和小型断路器的区别

Difference between MCCB and MCB

塑壳断路器主要作用是为低压配电系统和电动机保护回路中的过载、短路提供保护功能。

The main function of MCCB is to provide protection for overload and short circuit in low voltage distribution system and motor protection circuit.

由于其可靠性和稳定性，使之成为工业上应用十分广泛的产品。小型断路器同样是使用范围和数量都极大的断路器产品，主要功能是为建筑电气终端配电装置提供保护。

Because of its reliability and stability, it has been widely used in industry. Miniature circuit breaker is also a circuit breaker product with a large range of applications and quantity. Its main function is to provide protection for the building electrical terminal distribution device.

由于两者同属于断路器，且塑壳断路器多用于小容量的通断，所以了解两者的区别，选择合适的产品是十分现实和重要的。

Because both of them belong to circuit breaker, and molded case circuit breaker is mostly used for small capacity on-off, it is very practical and important to understand the difference between the two and choose the right product.