What is the difference between a miniature circuit breaker and a molded case circuit breaker

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What is the difference between a miniature circuit breaker and a molded case circuit breaker
08 22 , 2022

The main function of miniature circuit breaker (MCB) circuit breaker enclosures and a large number of circuit breaker products is to provide maintenance for building electrical terminal power distribution equipment. Since both are circuit breakers and plastic case circuit breakers are mainly used to keep the difference between the two, choosing the right commodity is very realistic and important. The main function of Molded Case Circuit Breaker (MCCB for short) is to provide protection for overload and short circuit in low-voltage power distribution systems and motor protection circuits. Due to its reliability and stability, it has become a very widely used product in industry. Below is a brief description. First, let’s talk about the basic commonalities. Since both are circuit breakers, there are some basic product standards that should follow and work the same way. Then talk about the difference between the two. Generally speaking, there are the following points: 1. Different electrical parameters 2. Different mechanical parameters 3. Apply different work environments Also, from a buying standpoint, there are actually several differences between the two. current level Molded case circuit breakers have a maximum current level of 2000A. The maximum current level of the miniature circuit breaker is 125A. Due to the difference in volume, in actual work, the effective area of ​​the plastic case circuit breaker also exceeds 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 less than 10 square meters. Meter. Instrument line. Therefore, in general, larger rooms are more suitable for selecting plastic case circuit breakers based on indoor conditions. installation method Plastic case circuit breakers are mainly mounted on screws, which are easy to clamp, have good contact and run smoothly. Miniature circuit breakers are mainly mounted on rails, sometimes resulting in poor contact due to insufficient torque. Due to the different installation methods of the two, the installation of plastic case circuit breakers is stronger and more difficult than miniature circuit breakers. Operation and Longevity operate. The molded case circuit breaker uses two sets of overcurrent and short-circuit equipment for maintenance, and the overcurrent maintenance action value can be adjusted manually, which is convenient and quick. Miniature circuit breakers use the same set of overcurrent and short circuit devices, the current cannot be adjusted, and sometimes the problem cannot be solved. Molded case circuit breaker has large spacing, arc extinguishing cover, strong arc extinguishing ability, can withstand large short circuit capacity, is not easy to cause short circuit, and has a longer service life than miniature circuit breakers. Application flexibility In this regard, plastic case circuit breakers are more prominent, and their setting flexibility is better than that of miniature circuit breakers. The protection devices of overcurrent and overcurrent plastic case circuit breakers are separate, and the action value of overcurrent maintenance can also be flexibly adjusted. The overcurrent maintenance and overcurrent protection of the miniature circuit breaker is a unified device, and there are certain deficiencies in the adjustment flexibility. Based on the above, it seems that the miniature circuit breaker is at a disadvantage, but in fact, in some cases, we still have to choose the miniature circuit breaker. For example, when the safety of the route must be improved, the miniature circuit breaker has high action sensitivity and fast breaking speed, which is more conducive to the maintenance of the route and electrical appliances.

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