What are the differences between MCCB and MCB?[Popular science of electrical and electronic knowledge]

what is the difference between MCCB and MCB? Both belong to the circuit breaker, must follow some major product implementation standards, and have the same principle. But there are still some differences between the two. Below, Chinese circuit breaker manufacturers will explain them in detail.

The difference between MCCB and MCB is the difference in application scope, electrical parameters, installation method and operation.

Application range of MCCB(molded case circuit breakers) and MCB (miniature circuit breakers)

The main function of the so-called MCCB is to protect the overload and short circuits in the low-voltage power distribution system and the motor protection circuit. Molded case circuit breakers are widely used in industry because of their stability and reliability.

Although the MCB(miniature circuit breaker) is also a circuit breaker product with a wide range of use and quantity, its main function is to protect the electrical terminal distribution device of the building.

Summarize:

It can be seen that although MCCB(molded case circuit breakers) and miniature circuit breakers belong to circuit breakers, their scope of use is different.

Because both MCB(molded case circuit breakers) and miniature circuit breakers are circuit breakers, they both comply with the product standards of basic circuit breakers, so their working principles are basically the same. The difference is that the electrical parameters of the molded case circuit breaker and the miniature circuit breaker are different, and the mechanical parameters are different.

[Different electrical parameters]
The electrical parameters of the molded case circuit breaker and the miniature circuit breaker are different. The current level of the molded case circuit breaker is as high as 2000A, while the maximum current level of the miniature circuit breaker is only within 125A. Because there is a gap in capacity between molded case circuit breakers and miniature circuit breakers, when the molded case circuit breakers and miniature circuit breakers are working, the effective area of the miniature circuit breaker is smaller than that of the molded case circuit breaker. The access wires are relatively thick and can reach more than 35 square meters, while the wires below 10 square meters are only suitable for connecting to miniature circuit breakers. Therefore, under normal circumstances, if the room is large, it is best to choose a molded case circuit breaker.

[Different installation methods]
In the installation method, the molded case circuit breaker is mainly installed by screws, which are easier to compress, and has good contact and stable operation. The miniature circuit breaker needs to be installed through the guide rail, which is easy to cause poor contact due to insufficient torque. Because the installation methods of molded case circuit breakers and miniature circuit breakers are different, the installation of molded case circuit breakers is more stable and less difficult.

[Difference in operation]
In terms of operation, molded case circuit breakers and miniature circuit breakers can use two sets of devices to protect overcurrent and short circuits respectively. At the same time, the overcurrent protection action value can also be manually adjusted, which is convenient and fast. However, the miniature circuit breaker can only use one set of devices for overcurrent and short circuits, and the current cannot be adjusted. Many problems cannot be solved after problems occur.

What are the differences between MCCB and MCB Summarize:

The above is a detailed introduction to the molded case circuit breaker and the miniature circuit breaker. Through the comparison between the molded case circuit breaker and the miniature circuit breaker, you must understand that the installation of the molded case circuit breaker is more stable for the voltage. Therefore, in the safety circuit breaker, It is best to choose a molded case circuit breaker. At the same time, I also hope that the introduction of Chinese circuit breaker manufacturers can be helpful to you.