It's a 4-pole MOV-based unit rated for 230/400 V AC systems with a maximum continuous operating voltage of 340 V common mode on L/PE and N/PE. The headline number here is the 40 kA maximum discharge current per mode, with a nominal discharge current of 15 kA — that's the figure you size coordination against downstream SPDs.
The 40 kA Imax (maximum discharge current) tells you this unit can survive a direct lightning-induced surge up to that level once. The 15 kA In (nominal discharge current) is the repeated-surge rating — this is the figure that governs service life in a location with frequent switching transients. The protection level Up is under 1.5 kV common mode, which means it clamps the surge low enough to protect downstream equipment with a 1.5 kV impulse withstand rating. The 340 V Uc means it won't thermally run away on a 400 V line with typical tolerances, but it does assume a TN-C earthing system — verify your system configuration before committing.
Clip-on DIN rail mounting, 72 mm wide (4 modules at 18 mm pitch), 69 mm deep, 81.4 mm tall. The 8-pitch 9 mm spacing is standard for the Acti9 range, so it lines up with busbars and neighbouring MCBs. The white RAL 9003 housing blends into a standard commercial panel aesthetic.
Associated breaker and remote signalling
This unit is designed to be paired with an associated circuit breaker — the spec lists IC60N, iC60H, or iC60L at 40 A curve C, with Icu ratings of 10, 15, or 25 kA respectively. That breaker provides the overcurrent backup the SPD needs per EN 61643-11. The remote signalling contact is a single changeover (1 SD, 1 C/O) rated at 0.25 A / 250 V AC — useful for feeding a status back to a PLC or BMS so you know when the MOV has degraded and the cartridge needs replacement.
Operating temperature range is -25 to 60 °C, storage from -40 to 85 °C, with relative humidity 5 to 90 %. Operating altitude rated to 2000 m. IK03 impact protection per IEC 62262 means it withstands a 0.35 J impact — enough for normal handling in a locked panel, but not for exposed locations. No IP rating is listed, which is typical for DIN-rail SPDs that live inside an enclosure.