The Schneider Electric A9L20200 is an Acti9 iPRD20 Type 2 surge arrester, 2-pole, rated 230 V AC (+/- 10%) at 50/60 Hz, with a maximum continuous operating voltage of 350 V common mode per the datasheet. It uses MOV technology and clips onto a DIN rail — standard panel integration for distribution boards.
Nominal discharge current is 5 kA (common mode L/PE and N/PE); maximum discharge current is 20 kA (common mode). That 20 kA rating tells you this unit can safely divert a direct lightning-induced surge up to that level without failing short — it's sized for main distribution panels in TN-C-S earthing systems, not sub-panel or device-level protection. The Type 2 classification per EN 61643-11:2012 and IEC 61643-11:2011 means it's tested for the main distribution board location, handling the bulk of surge energy before it reaches sensitive loads downstream. The protection level (Up) is under 1.1 kV common mode — within tolerance for typical 230 V equipment impulse withstand. Temporary overvoltage (Ut) is 337 V L/N for 5 s withstand, and 1200 V N/PE for 200 ms safe failure mode — the MOV will thermally disconnect rather than rupture under sustained overvoltage. Ground residual current is 0.003 mA to 0.6 mA, which keeps leakage well below nuisance RCD trip thresholds.
Clip-on DIN rail mounting, 36 mm wide (2 x 18 mm modular pitches), 69 mm deep, 85 mm high. Tunnel-type terminals accept 2.5 to 35 mm² on both top and bottom — solid or stranded copper, torque to 2.5 N·m. The white (RAL 9003) housing blends into standard distribution board layouts. Operating temperature range is -25 to 60 °C, storage -40 to 85 °C, with relative humidity 5 to 95%. IK03 impact rating per IEC 62262 means it withstands 0.35 J impacts — adequate for enclosed panel installation, not for exposed locations.