What this cartridge does in the panel
The A9L1C300 is a plug-in surge protection cartridge from the Schneider Acti9 iPRD1 C25r family, rated as a Type 1+2 arrester per IEC 61643-11:2011. It handles a nominal 25 kA discharge current (Imax 65 kA) and a 25 kA Iimp impulse current (12.5 A·s), with a 50 kA follow-current rating. For a petrochemical or process panel, that Type 1+2 classification means it covers both direct lightning-strike energy (10/350 µs wave) and switching-induced surges (8/20 µs) in one cartridge — no separate coarse and fine stage needed. The 1.5 kV protection level (Up) keeps let-through voltage low enough to protect downstream electronics in a DCS or safety-instrumented system loop.
The cartridge plugs into the iPRD1 C25r 3P base module (not included). The white (RAL 9003) thermoplastic body carries green/red flag indicators for operating state and fault indication, which lets a field tech confirm SPD status without opening the panel door. Ambient storage range is -40 to 85 °C; operating altitude is 0 to 2000 m.
The Type 1+2 rating is the key selection gate: it combines a 10/350 µs impulse (Iimp 25 kA) for direct-strike energy with an 8/20 µs nominal discharge (In 25 kA) for switching transients. The 275 V Uc (maximum continuous operating voltage) and 442 V temporary overvoltage withstand for 120 minutes mean it can ride through a sustained line swell without failing short — important on a TN-C earthing system where the SPD sees phase-to-neutral voltage continuously. The GDT (gas discharge tube) technology inside handles the high-energy pulse, but note it's a cartridge only; the base module holds the thermal disconnector and remote-signalling contacts.