Delixi 3P air switch, additional current 630A, additional voltage 380V. The Icu=Ics=70kA of this circuit breaker. When the short-circuit current reaches 70kA, can the circuit breaker still be used? Assuming it works, the ICU is now at its limit, which is paradoxical. Assuming that it can't be used, ICS is 70KA, which clarifies that it can be used. Is there any resistance? Why Ics=Icu?
In fact, the introduction of the ICS and ICU standards by the IEC is the result of the concession of the NEMA standard and the VDE standard United States. The United States NEMA adopted a similar ICU standard, while the Germany VDE chose ICS to measure the short-circuit function, so there was controversy. Eventually, both of these guidelines were codified in the standard in 1987.
This can cause problems down the road. For these two policies, manufacturers should prepare more samples, which is a waste of money and energy. In fact, in terms of design margin, ICS is more reliable. After all, many short-circuit experiments have been done, and there is verification after the test. Customers are more tolerant of this policy. At this time, some professional leaders began to share these two policies, setting Ics = 100% Icu. Gradually, this policy has become a symbol of the technical content of the circuit breaker, and it has gradually been accepted by us.
Of course, the ICS was not high at the beginning, and the national standard did not die. You can reach the lowest standards, but it's not the same thing whether the customer chooses you or not. However, with the development of new technologies and new materials, various manufacturers are exploring various key points of arc extinguishing in imitation and experiments, and the development of silver dots and blowing materials is more sensitive than the first. We have gradually achieved Ics=100% Icu, and many domestic manufacturers have reached this policy.
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