The main function of miniature circuit breakers (abbreviated in English) MCB) circuit breaker enclosures and large quantities of circuit breaker products is to provide maintenance for building electrical terminal distribution equipment. Since both belong to circuit breakers, plastic case circuit breakers are mainly used to hold the difference between the two, and it is very realistic and important to choose the right commodity.The main function of the molded case circuit breaker (MCCB for short) is to provide protection for overload and short circuit in the low-voltage power distribution system and the motor protection circuit. Due to its reliability and stability, it has become a very widely used product in industry. Here's a brief description.
First, let's talk about the basic commonalities. Since both are circuit breakers, they should follow some basic product standards and have the same working principle. 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 purchasing point of view, there are actually several differences between the two.
Current level
The maximum current level of the molded case circuit breaker is 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 micro circuit breaker, and the connected wires are relatively thick, which can reach more than 35 square meters, while the micro circuit breaker is only suitable for connecting less than 10 square meters. meter wire. Therefore, in general, larger rooms are more suitable for choosing 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 operate 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 Life
operate. The plastic case circuit breaker selects 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. Plastic case circuit breakers have large spacing, arc extinguishing cover, strong arc extinguishing ability, can withstand large short circuit capacity, are not easy to cause short circuit, and have 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 overcurrent and overcurrent protection devices of the plastic case circuit breaker are separate, and the action value of the overcurrent maintenance can also be flexibly adjusted. The overcurrent maintenance and overcurrent protection of the miniature circuit breaker are unified equipment, and there are certain deficiencies in the adjustment flexibility.
Based on the above, it seems that the micro-circuit breaker is at a disadvantage, but in fact, in some cases, we still have to choose the micro-circuit breaker. For example, when the safety of the route must be improved, the micro-circuit breaker has high action sensitivity and fast breaking speed, which is more conducive to the maintenance of the route and electrical appliances.
Post time: Jul-15-2022