The Schneider Electric A9L2F900 is an iPRD F40r surge protection cartridge from the Acti9 range, rated as Type 2+3 per IEC 61643-11. It handles a maximum discharge current of 40 kA in differential mode (L/N) and responds in under 25 ns, clamping the voltage protection level to below 1.5 kV. The integrated fuse means no separate external overcurrent protection is needed for the SPD circuit — one less part to spec and panel-wire.
Type 2+3 classification means this cartridge handles both main distribution board surges (Type 2, 8/20 µs wave) and equipment-level protection (Type 3, combined wave). The 40 kA max discharge (Imax) tells you it can absorb a single high-energy strike without failing; the 20 kA nominal discharge (In) is the rating for repeated events over the product's life. The < 25 ns response time is typical for MOV-based suppressors; it clips fast enough to protect sensitive electronics like PLC power supplies or VFD control boards. The temporary overvoltage (TOV) ratings — 337 V for 5 s withstand, 442 V for 120 min safe failure mode — tell you the cartridge survives a sustained overvoltage event (e.g., a lost neutral) without catching fire, transitioning to a fail-safe short rather than catastrophic rupture.
This cartridge plugs into the iPRD F40r 3P or 3P+N base module (sold separately). The 18 mm width matches a single DIN-rail pitch; two pitches (9 mm each) are occupied. It's designed for TT, TN-S, and TN-C earthing systems, covering most commercial and industrial distribution panels in Europe and markets following IEC wiring rules.