Delixi 3P air switch, rated current 630A, rated voltage 380V. The Icu=Ics=70kA of this circuit breaker. When the short-circuit current reaches 70kA, can the circuit breaker still be used? If it works, the ICU is already at its limit, which is a contradiction. If it can't be used, ICS is 70KA, which means it can be used. Is there any resistance? Why Ics=Icu?
In fact, the IEC introduced the ICS and ICU specifications, which are the result of the concession of the NEMA code and the VDE code in the United States. The United States NEMA chose the target of a similar ICU specification, while the Germany VDE chose ICS to measure the short-circuit function, so there was controversy. Eventually, both goals were written into the norm in 1987.
This can cause problems down the road. For these two goals, manufacturers need to prepare more samples, which is a waste of money and energy. In fact, in terms of design margins, ICS is more solid. In fact, many short circuit tests have been done, and there is verification after the test. Customers are also more willing to bear this goal. At this time, some industry leaders began to align these two goals, setting Ics = 100% Icu. Gradually, this goal became a symbol of the technical content of the circuit breaker, and gradually we took it.
Of course, the ICS was not high at the beginning, and the national standard did not die. You can reach the minimum specification, but it's not the same thing whether the customer chooses you or not. However, with the development of new technologies and new data, various manufacturers are exploring various key points of arc extinguishing in imitation and experiments, and the development of silver point and blowing data is relatively agile. We have also gradually achieved ICS=100% Icu, and many domestic manufacturers have reached this goal.
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