The Schneider Electric A9L1F625 is a Type 1+2 surge arrester from the Acti9 iPRD1 range, designed for electrical distribution networks in TT and TN-S earthing systems. It carries a 25 kA impulse current (Iimp) per pole in differential mode and a 100 kA Iimp in common mode, with a response time under 100 ns for both L/N and N/PE paths. The 3P+N configuration with integrated fuse and pluggable cartridges means this unit handles both lightning-induced surges (Type 1) and switching transients (Type 2) in a single DIN-rail footprint.
The 25 kA nominal discharge current (In) per pole in differential mode tells you this arrester can repeatedly clamp surge energy without degrading — it's not a one-shot device. The 75 kA short-circuit withstand rating (Ifi) means the unit safely clears a follow current from the mains after the surge passes, which is critical for coordination with upstream overcurrent protection. The <100 ns response time is fast enough to protect sensitive electronics like PLC power supplies and VFD control boards, but verify the voltage protection level (Up) against your equipment's impulse withstand. For panels in washdown areas or outdoor cabinets, this unit needs a separate IP-rated enclosure. The IK05 mechanical impact rating means it withstands 0.7 J impacts, typical for a distribution board but not for exposed locations.
Clip-on DIN rail mounting, 14 x 9 mm pitch width (126 mm total), 86 mm depth, 105 mm height. The 3P+N module occupies the space of four standard MCB widths. Power terminals accept 6–35 mm² solid/stranded or 6–25 mm² flexible; earthing terminal takes 16–35 mm² solid/stranded or 16–25 mm² flexible. Strip lengths: 18 mm for power and earth terminals, 10 mm for the remote signalling connection. Tightening torque 4.5 N·m on the power circuit. Remote signalling is included via a volt-free contact for monitoring the arrester status at a PLC or BMS input. Local indication uses a green flag for normal operation and a red flag for fault — no need to open the panel door to check cartridge condition.