Air circuit breaker ACB self-diagnosis test: ACB connects current 8 times rated current 12.8KA (8*1600 is 12.8KA), it will act after a delay of 0.2 seconds. Air circuit breaker YCW1 is suitable for the circuit of AC 50Hz/60Hz with rated service voltage 400V, 690V and rated service current up to 6300A. It is mainly used to distribute electric energy and protect circuits and electric equipment against over-load, under-voltage, short-circuit and single-phase earthing fault. With intelligentized and
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