Cascade connection of fuses and breakers
	When several fuses and breakers are connected as shown below, F1 and F2 etc. are to be selected in consideration of their I2t as well as the rated currents. The I2t of F1 should be at least three times greater than that of F2. Further-more, if F2 is a no-fuse breaker which operates rather slower than a fuse, F1 may blow earlier. Therefore, it is important to compare the clearing characteristics of the fuse with the operating characteristics of the breaker.

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