The Schneider Electric A9L16555 is an Acti9 iPRD65r Type 2 surge arrester — a 1-pole MOV-based unit rated for 460 V continuous operation (L/PE) on IT earthing systems. Its headline numbers: 65 kA maximum discharge current (common mode L/PE), 20 kA nominal discharge current, and a voltage protection level below 2 kV. That puts it squarely in Type 2 SPD territory for distribution boards — sized for main or sub-distribution panels where lightning-induced surges need clamping before they reach downstream electronics.
This part is obsolete per the manufacturer's lifecycle status.
Mounts via clip-on to DIN rail. Tunnel-type terminals top and bottom accept 2.5 to 35 mm² conductors; tighten to 2.5 N·m. The remote signalling contact (1 C/O, rated 0.25 A / 250 V AC) lets a PLC or panel indicator monitor arrester status without opening the enclosure. Complies with EN 61643-11 and IEC 61643-11.