The difference between molded case circuit breakers and miniature circuit breakers

In fact, in our daily life, miniature circuit breakers and molded case circuit breakers are still very common, but we only focus on how to use and operate them, and do not really understand the two parts of miniature circuit breakers and molded case circuit breakers. synonym. Next, CHYT Electric will introduce the two concepts of miniature circuit breaker and molded case circuit breaker and the difference between miniature circuit breaker and molded case circuit breaker.

Similarities Between Miniature Circuit Breakers and Molded Case Circuit Breakers

Because both belong to circuit breakers, both need to comply with some basic product standards and have the same working principle.

The difference between miniature circuit breakers and molded case circuit breakers

1. Different electrical parameters
2. Different mechanical parameters
3. The working environment is different
In addition, from the point of view of purchase, let's talk about the differences between the two.
Current level
Molded case circuit breakers have a current rating of up to 2000A. The maximum current rating of miniature circuit breakers is within 125A. Due to the difference in capacity between the two, in specific work, the effective area of the molded case circuit breaker is also larger than that of the miniature circuit breaker, and the connected wires are relatively thick, which can reach more than 35 square meters, while the miniature circuit breaker is only suitable for connecting 10 square meters. wire below the square. Therefore, generally for indoor conditions, it is more suitable to choose a molded case circuit breaker for a larger room.
Installation method
Molded case circuit breakers are mainly screw-mounted, easy to compress, good contact, and stable operation. The miniature circuit breaker is mainly installed through the guide rail, and sometimes the contact is poor due to insufficient torque. Due to the different installation methods of the two, the installation of the molded case circuit breaker is more stable and less difficult than that of the miniature circuit breaker.
Operation and life
Operationally. The molded case circuit breaker adopts two sets of devices for protection against overcurrent and short circuit respectively, and the action value of overcurrent protection can be adjusted manually, which is convenient and quick. However, the miniature circuit breaker shares a set of devices for overcurrent and short circuit, and the current cannot be adjusted, which makes it impossible to solve the problem in many cases. The molded case circuit breaker has a large distance between phases, and has an arc extinguishing cover, which has a strong arc extinguishing ability, can withstand a larger short-circuit current, and is not easy to cause a short circuit between phases, so the service life is also longer than that of the miniature circuit breaker.
Flexibility of use
In this regard, the molded case circuit breaker is more prominent, and its flexibility in setting is better than that of the miniature circuit breaker. The overcurrent and short circuit protection devices of the molded case circuit breaker are independent, and the action value of the overcurrent protection during use can also be adjusted flexibly. The over-current protection and short-circuit protection of the miniature circuit breaker are a unified device, and there are certain deficiencies in the adjustment flexibility.
According to the above situation, it seems that the miniature circuit breaker is at a disadvantage, but in fact, for some time, it is still necessary to choose the miniature circuit breaker. For example, when it is necessary to improve the safety of the line, because the miniature circuit breaker has high sensitivity and quick breaking action, it is more conducive to the protection of lines and electrical appliances.