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、塑殼斷路器對過流和短路采用兩套裝置分別保護，過流保護動作值可以人工調整。小型斷路器對過流和短路共用一套裝置，電流不可調。

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、塑殼斷路器能接入較粗導線，如35平方以上的。小型斷路器只適合接10平方以下的導線。

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、小型斷路器動作靈敏度比塑殼斷路器高。

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

4、塑殼斷路器端頭用螺母聯接，容易壓緊，接觸良好。小型斷路器采用較小的壓緊端子，且只能用螺絲刀擰緊，力矩不夠，不容易壓緊，接觸不太好。

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、塑殼斷路器相間距離大，且有滅弧罩，滅弧能力強，能承受更大的短路電流，還不易引發相間短路。壽命也長。

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.

塑殼斷路器和小型斷路器的區別

Difference between MCCB and MCB

塑殼斷路器主要作用是為低壓配電系統和電動機保護回路中的過載、短路提供保護功能。

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

由于其可靠性和穩定性，使之成為工業上應用十分廣泛的產品。小型斷路器同樣是使用范圍和數量都極大的斷路器產品，主要功能是為建筑電氣終端配電裝置提供保護。

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.

由于兩者同屬于斷路器，且塑殼斷路器多用于小容量的通斷，所以了解兩者的區別，選擇合適的產品是十分現實和重要的。

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.