Plastic case circuit breakers and intelligent universal circuit breakers are both popular circuit breaker products, and because of this, some people do not know which one to choose when choosing a circuit breaker is more appropriate. In fact, as long as we know the difference between them, we will easily and easily choose the right one. So, what is the difference between intelligent universal circuit breakers and molded case circuit breakers? The following Rui Rui on the differences between the two for you to introduce the following.

1, in the rated current, molded case circuit breaker is generally 630A (some new products can reach 1600A) below, while the intelligent universal circuit breaker rated current to be much larger, generally 630A-6300A. In addition, in the segmentation capacity, intelligent universal circuit breaker than molded case circuit breaker high. In practice, the circuit above 800A or segmentation capacity requirements of particularly high circuit or the need for more functional circuit should use intelligent universal circuit breakers, 630A circuit below, the general use of molded case circuit breakers.

2, a wide range of molded case circuit breaker products, which are characterized by compact structure, easy to operate, relatively simple features, generally configured with overcurrent decoupler and instantaneous decoupler, intelligent universal circuit breaker is functional, especially in recent years the application of single-chip computer technology, intelligent universal circuit breaker to the direction of high performance, easy maintenance, network development. 

3, plastic case circuit breakers using plasticized structure, characterized by the circuit breaker shell, frame using plastic pressed, the contacts, arc extinguishing system are placed in the insulation chamber to prevent inter-phase short circuit, to ensure that the arc upward spray, to ensure that the contact system reliable breaking. The intelligent universal circuit breaker, on the other hand, adopts a modular structure and is divided into parts such as the frame, the contact interrupting system, the manual operating mechanism, the electric operating mechanism, the intelligent controller and the drawer block. Each part has become a complete and independent component, assembled with only 1-2 screws to fix it, disassembly and installation is very convenient for maintenance.

4, molded case circuit breaker is grounded outside the terminal contacts, arc extinguishing chambers, release and operating mechanism are installed in a plastic enclosure, generally do not consider maintenance, suitable for branch circuit protection switch, overcurrent detonator electromagnetic and electronic two, general electromagnetic molded case circuit breaker for non-selective circuit breakers, only long delay and instantaneous two types of protection, electronic molded case circuit breaker has a long delay, short delay, instantaneous and ground fault The electronic molded case circuit breaker has long delay, short delay, instantaneous and ground fault four kinds of protection functions. Some of the newer electronic moulded case circuit breakers are also available with area selective interlocking functions. Most of the molded-case circuit breakers for manual operation, there are also some with motor operation.

5, intelligent universal circuit breaker all parts are installed in an insulated metal frame, often open type, can be installed with a variety of accessories, replacement contacts and parts more convenient, mostly used in the power end of the main switch. There are several types of overcurrent detachers such as electromagnetic, electronic and intelligent detachers. The circuit breaker has four protection sections: long-delay, short-delay, instantaneous and earth fault, and each protection setting is adjusted within a certain range according to its shell frame level. Manual and electric operation are available. With the development of microelectronics technology, some intelligent circuit breakers now have area-selective interlocking functions, which fully guarantee the sensitivity and selectivity of the action.