The Schneider Electric A9L16672 is an Acti9 iPRD20r modular surge arrester — Type 2, 1P+N, rated for 230 V AC (+/- 10 %) at 50/60 Hz. The MOV + GDT technology handles common-mode and differential-mode surges up to 20 kA maximum discharge current, with a voltage protection level below 1.4 kV (type 2 N/PE).
The 20 kA maximum discharge current (common mode L/PE, N/PE, and differential mode L/N) tells you this arrester can safely divert a direct lightning-induced surge at the service entrance of a small commercial building — it is not a fine-protection device for sensitive electronics downstream. The nominal discharge current is 5 kA per mode, which is the standard test current for Type 2 arresters per EN 61643-11 and IEC 61643-11. The 69 mm depth and 36 mm width (4 x 9 mm pitches) mean it occupies a standard 4-module width on the DIN rail — plan for that slot in your panel layout. The tunnel-type terminals accept 2.5 to 35 mm² conductors on both the line and load sides, which covers most incoming supply cables in a small commercial panel. Tightening torque is 2.5 N.m.
The A9L16672 carries quality labels OVE, NF, and KEMA-KEUR, and is certified to EN 61643-11 and IEC 61643-11. The remote signalling contact (1 C/O, rated 0.25 A / 250 V AC) allows a panel PLC or alarm system to monitor arrester status — useful for maintenance planning in an unattended site.