The circuit breaker has a long history. The earliest one was in 1885, when the technology was still not perfect. Up to now, we have seen new products that have added many features and are convenient for everyone to use. What are the main characteristics of the circuit breaker? Now let's talk about it.

Rated limit short-circuit breaking capacity u, the parameters in which not only consider its breaking capacity, but also can make the device work normally and play a good maintenance role after it breaks several faults. If it is molded case type, Icu is enough to break the short circuit switch and trip, as long as it is greater than 25% 1cu, it is reasonable. In the current market, Ics is mostly (50% - 75%) 1 cu.

The current limiting breaking capacity is also one of the characteristics, that is, the ability to limit the fault current. When the device is short circuited, it will make the head open quickly and then generate an arc, just like the rapid increase of electrical resistance in the line, which will hinder the increase of fault current. The less time it is disconnected, the better the implementation effect. At the same time, it can also reduce the electromagnetic effect caused by short circuit and other hazards. The electric effect and thermal effect have no bad influence on the equipment. On the contrary, they can prolong the life of the circuit breaker.

The short circuit protection of the feature involves voltage and current, which is relatively dangerous. Therefore, the relevant equipment has the function of short circuit protection to protect our personal safety. It should be noted that after the load changes, the parameters set in the original year should be adjusted, so as to prevent the frequency case tripping from affecting the quality of electricity. It is also convenient to use and has worries about the future. If the value you set is too large, it will not have a good impact, and the device will not be protected as before.

Over cut delay protection means that the equipment will burn out after exceeding the range, and this feature just protects it, which can quickly cut off the power supply within the specified time. Overload requires continuous accumulation, and its protection is not very fast.

Isolation function, that is to say, it can isolate the current from people and reduce the harm to people. If the number of short circuit trips is large, the switch performance will decline, and the current leakage caused by it will also greatly increase. The safe current of human body is 30mA and below, which cannot be exceeded, otherwise there will be danger. If Shilu exceeds 3O0mA and lasts for two hours in a harsh environment, the insulation will be damaged, resulting in short circuit, and then fire. It is very dangerous.

If the circuit breaker leaks electricity, the danger will increase when we connect the corner to a certain strong current. Therefore, it also has a characteristic of leakage protection. The leakage device can reliably disconnect the grounding fault and effectively cut off.