Type 2 surge protection devices are intended for installation in low-voltagepower distribution systems to control transient overvoltage caused by indirectlightning strikes and switching operations.The device is suitable for 230/400V AC systems at 50/60Hz and can be applied inTT, IT, TN-S, TN-C, and TN-C-S earthing arrangements. Performance is verifiedusing an 8/20µs impulse current waveform.Key electrical characteristics include nominal discharge current (In) andmaximum discharge current (Imax), defining the capability to repeatedly dischargesurge currents. The device is normally installed in distribution boards or downstream of a Type 1 device.Design and testing are carried out in accordance with IEC 61643-11 requirements.