Generally also μA level, the value of 30μA or less is qualified.
The smaller the leakage current, the better. For the leakage current should especially emphasize that it must be stable, not allowed to automatically rise in the work, once the leakage current is found to rise automatically, it should be eliminated immediately, because the instability of the leakage current is to accelerate the aging of the lightning protector and the explosion of the lightning protector is the direct cause.