GB/T 11022-1999 general standard, GB3906 is the switchgear standard, GB1984 is the circuit breaker standard, GB1985 is the isolation switch and grounding switch standard, GB3804 is the load switch standard method, 1,2,3,4,5 is a series of tests during short-circuit breaking, and it is generally believed that the actual current cut off by the circuit breaker during operation is not all the rated short-circuit current, so there are 1,2,3,4,5 corresponding to T10 (10% rated short-circuit current), T30 (30% rated short-circuit current), T60, T100, T100a (Asymmetry)
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