Answer Posted / jitendra gosai

Standard tripping classes are 10 A, 10, 20, 30. The
tripping
class indicates according to IEC 60947-4-1 the maximum
tripping time in seconds under specified conditions of test
at
7.2 times the setting current and specifics tripping and non
tripping times for 1.5 and 7.2 times the setting current.

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hi frnds...pls send me aptransco previous papers .....pls..pls,,,(madhar.rocking@gmail.com)and suggest me some websites

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