The 4-pole panel switch combined surge arrester (Category B+C / T1+T2) is designed for three-phase AC systems with neutral (L1, L2, L3 + N). It is a device mounted on a DIN rail (35 mm) with a visual status indicator. The listed maximum discharge current in retail/specification entries is 6 kA. Its purpose is to protect against surges caused by lightning and switching disturbances in low-voltage installations.