... :20kA 4)In current:10kA 1.Product ApplicationSPD-20R series surge protector is suitable for TT,IT,IT-S,TN-S ... is used in the equal potential connection in case of surge current caused by lightning strike or similar, usually installed in ... and LPZn, such as before the residential distribution box, computer center, the information, electronic, and control equipment or the nearest socket ...