Molded case circuit breakers and miniature circuit breakers difference, national electrical switch factory, www.guofadq.com 15957745520
Molded case circuit breakers ( English abbreviation is MCCB ) is mainly used for low voltage distribution system and motor protection circuit overload, short circuit protection function. Due to its reliability and stability, make it become the industrial application of a very wide range of products. Miniature circuit breaker ( English abbreviation is MCB ) is also used in range and numbers are great circuit breaker products, the main function is for the construction of electrical power distribution terminal device to provide protection. Because they belong to the circuit breaker, and molded case circuit breaker used for small capacity switching, so understanding the difference between the two, choose the right products is very realistic and important. Here is simple to do next.
First basic similarities, because both of them belong to the circuit breaker, all need to abide by some basic product standards, has the same working principle. Then said the difference, basically have the following:
1 different electrical parameters
2 different mechanical parameters
3 using different work environment
In addition to buy point of view, specifically for the difference between the two.
The operation and service life
View of operation. Molded case circuit breakers for overcurrent and short-circuit using two sets of device respectively protection, overcurrent protection value can be adjusted manually, convenient and quick. The miniature circuit breakers for overcurrent and short-circuit share a set of device, current is adjustable, cause a lot of time to solve the problem. Molded case circuit breaker and the distance is large, and the arc shield, arcing ability is strong, can bear bigger short-circuit current, and not easy to cause the interphase short circuit, thus the service life is better than a miniature circuit breaker principals.
Flexibility of use
In this respect or molded case circuit breaker is more outstanding, the flexibility of the device of miniature circuit breaker is better than. Molded case circuit breaker over-current and short circuit protection devices is independent, the use of overcurrent protection in operation value also can make flexible adjustment. Miniature circuit breaker over-current and short circuit protection device is uniform, the regulation flexibility on the weakness of.
According to the above situation seems to be a miniature circuit breaker at a disadvantage, but in fact for some time, still need to choose the miniature circuit breaker. For example, need to improve line safety, because of miniature circuit breaker for high sensitivity, breaking action fast, more conducive to the lines and electrical protection.
It can be seen both have their own advantages and is suitable for use in the place, the key is to fully understand the molded case circuit breakers and miniature circuit breakers difference, according to their own needs to choose.
Current rating
Molded case circuit breaker current highest grade 2000A have. And miniature circuit breakers the maximum current rating within 125A. Because both in the capacity of the gap, in specific work, molded case circuit breaker of the effective area is also bigger than the miniature circuit breakers, to simultaneously access the lead wires are relatively coarse, can reach more than 35 square feet, and the miniature circuit breaker is only suitable for ground below 10 square wire. It is generally for indoor circumstance, larger rooms and more suitable choice of molded case circuit breaker.
Installation mode
Molded case circuit breaker with screw mounting, easy to compress, good contact, stable operation. The miniature circuit breaker is mainly through the guide rails are mounted, sometimes due to insufficient torque caused by poor contact. Because of the different installation methods, resulting in a molded case circuit breaker mounting than miniature circuit breaker is more stable, less difficulty.
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