Schneider Electric Surge Protectors

This Acti9 surge arrester is a Type 2 device, installed at the distribution board downstream of the main incomer. Even installations without a lightning rod still see induced surges from nearby strikes and switching transients from ordinary grid operation, which is why Type 2 is treated as the baseline protection level for any distribution board. It is rated for a single-phase live-and-neutral circuit, with a 260V maximum continuous operating voltage (Uc) -- set with margin above the circuit's normal running voltage so it stays inactive through everyday fluctuation and only reacts when a genuine surge occurs. Its 20kA nominal discharge current (In) is the standardized rating for repeated surge events, backed by a 65kA maximum discharge capacity for a single severe event. The voltage protection level (Up) is under 1.5kV -- this is the residual voltage actually passed through to connected equipment during a surge, the figure that determines whether that equipment survives.