The Schneider Electric A9L16444 is a Type 2 surge arrester from the Acti9 iPRD family, designed to protect electrical distribution networks against transient overvoltages. It uses MOV (metal oxide varistor) technology and is rated for a maximum discharge current of 40 kA per mode (L/PE and N/PE), with a nominal discharge current of 15 kA. The rated operational voltage is 230 V AC (+/- 10%) at 50/60 Hz, and the maximum continuous operating voltage is 340 V common mode. The voltage protection level is clamped to under 1.4 kV, which means downstream equipment sees a limited let-through voltage during a surge event.
This is a 2-pole (2P) unit that clips onto a DIN rail — standard for panel mounting. Dimensions are 36 mm wide, 81 mm high, and 69 mm deep, occupying 4 module pitches at 9 mm each. The white (RAL 9003) housing matches the Acti9 aesthetic. Tunnel-type terminals on both top and bottom accept 2.5 to 35 mm² conductors, with a tightening torque of 2.5 N.m. The earthing system is TN-C, so it's suited for panels where the neutral and protective earth are combined.
Remote signalling and compliance
This variant includes remote signalling — a 1 C/O (changeover) contact rated at 0.25 A / 250 V AC, so you can wire a status back to a PLC or indicator lamp for remote monitoring of the arrester's health. The operating temperature range is -25 to 60 °C, storage from -40 to 85 °C, and relative humidity 5 to 90%. IK03 impact resistance per IEC 62262 means it withstands a 0.35 J impact — fine for enclosed panel use.