A circuit breaker refers to a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power lines and motors. When they have serious overload or short-circuit and under-voltage faults, they can automatically cut off the circuit. Its function is equivalent to a fuse switch. Combination with overheating and underheating relay, etc. Moreover, it is generally not necessary to change the components after breaking the fault current. They have been widely used in different fields. The world’s earliest circuit breakerwas produced in 1885, which is a combination of a knife head and an overcurrent release. In 1905, the aircircuit breaker with free tripping device was born. Since 1930, with the advancement of science and technology, the discovery of the arc principle and the invention of various arc extinguishing devices have gradually formed mechanisms. In the late 1950s, due to the rise of electronic components, electronic trip units were produced. Today, due to the popularization of single-chip microcomputers, intelligent circuit breakers have appeared.
With the development of China’s power industry, the power equipment manufacturing industry has accelerated its growth. However, under the situation of overcapacity, rising costs and increasingly fierce market competition, some enterprises compete at low prices and low quality, cut corners and shoddy goods in order to obtain illegal profits, resulting in quality and safety accidents […]
Maximum discharge current Imax The maximum discharge current Imax is defined according to the estimated exposure level relative to the building’s location. The value of the maximum discharge current (Imax) is determined by a risk analysis (see table in Figure 1). Fig. 1 – Recommended maximum discharge current Imax according to the exposure level Exposure […]
In lightning protection products, surge protectors and arresters are widely used. Both are important components to protect electronic equipment. There are also fundamental differences. Let us first see what these two lightning protection products are. The surge protector is to limit the instantaneous overvoltage that enters the power line and signal transmission line within the voltage range […]
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