The A9L16443 is a Type 2 surge arrester (MOV-based) from the Acti9 iPRD65r range, designed for TN-C earthing systems in distribution boards. Its 340 V UC maximum continuous operating voltage (common mode L/PE) matches 400 V AC (+/- 10%) networks — the standard European low-voltage three-phase supply. The nominal discharge current of 20 kA (L/PE and N/PE) and maximum discharge of 65 kA (L/PE) define its energy-handling capacity: 20 kA In is the rating for repeated surge events per IEC 61643-11, while the 65 kA Imax covers the single worst-case strike the MOV block can survive without failing short. The voltage protection level Up is <1.5 kV (common mode, Type 2 L/PE), which tells the panel builder what voltage spike the protected equipment sees — 1.5 kV is within the impulse withstand of most industrial control gear (IEC 60664-1 overvoltage category III/IV). Clip-on DIN-rail mounting and the 54 mm width (3-pole, 6 x 9 mm pitches) mean it occupies three modular spaces in a standard enclosure. The tunnel-type terminals accept 2.5 to 35 mm² conductors, sized for the incoming supply cable. The integrated remote-signalling contact (1 C/O, rated 0.25 A / 250 V AC) allows the BMS or PLC to monitor the arrester's end-of-life status without a visual check.
The arrester is certified to EN 61643-11 and IEC 61643-11, the harmonized standards for low-voltage surge protective devices. The IK03 mechanical impact rating per IEC 62262 confirms the enclosure withstands 0.35 J — sufficient for normal handling in a locked distribution board. Compliance documentation (declaration of conformity, RoHS, REACH) for this Schneider Acti9 series is available through the standard request process at time of order.