Selection Of The Nominal Spd Discharge Current In (impact Current Carrying Capacity)
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The peak current of an 8/20 μs current waveform flowing through surge protective device. This is used for Class II classification testing and as a precondition for Class I and Class II classification testing of surge protector.
In is the maximum peak surge current that surge protection device can withstand a specified number of times (usually 20 times) with a specified waveform (8/20 μs) without substantial damage.
The difference is obvious: Imax only tests the SPD once without substantial damage; whereas In allows 20 such tests without substantial damage. Therefore, Imax is the current limit of the impulse, and the maximum discharge current is also called the limiting impulse current capacity. Clearly, Imax > In.
