The Schneider Electric A9L16559 is an Acti9 iPRD65r Type 2 surge arrester in a 3P+N configuration, rated for 230/400 V AC distribution networks. It's designed for small commercial TT and TN-S earthing systems, clipping onto a DIN rail with a tunnel-type terminal accepting 2.5 to 35 mm² conductors.
The 65 kA maximum discharge current (Imax) is the peak the MOV+GDT cartridge can handle once before failure — it's the 'don't exceed this' ceiling, not the normal operating level. The nominal discharge current (In) of 20 kA per mode is the rating that governs routine surge life; a site with frequent lightning strikes should coordinate this with the upstream MCB (the iC60N or NG125 options listed in the spec). The <1.5 kV protection level (Up) means the clamped voltage stays under that threshold at In, which is tight enough to protect most downstream electronics without an additional fine-stage suppressor.
Deployment Context
Clip-on DIN-rail mount, 72 mm wide (4 module spaces at 18 mm each), so it fits a standard distribution board. The remote signalling contact (1 C/O, rated 0.25 A/250 V AC) lets a PLC or building management system monitor cartridge health without opening the panel.
