An SCR has a half-cycle surge current rating of 3000 A on a 50 Hz supply. What is its one-cycle surge current rating?
Correct answer C. 2121.32 A
Explanation
Equal heating requires equal I²t: I²(T) = 3000²(T/2), so the one-cycle rating is 3000/√2 = 2121.32 A.
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