The Schneider Electric A9L16685 is a Type 2 surge arrester cartridge from the Acti9 range, designated C40-340. It's the replaceable MOV element for the iPRD base unit — when the flag shows red, this cartridge has absorbed its last surge and needs swapping. Rated for 230 V AC 50 Hz networks with TT or TN earthing, it handles a maximum discharge current of 40 kA and a nominal 15 kA, clamping voltage to under 1.4 kV. The 340 V maximum continuous operating voltage (MCOV) means it sits on the line without tripping until a real surge hits. Response time is under 25 ns — fast enough to catch the leading edge of a lightning-induced transient before it propagates into sensitive loads downstream.
The cartridge plugs into the iPRD base module — no tools, no wiring. The 18 mm width matches a standard DIN-rail module pitch, and the white RAL 9003 housing with the red/white flag gives a quick visual health check during walkthroughs. Rated for indoor use (IP20 front face) in distribution boards. Operating temperature range is -25 to 60 °C, storage from -40 to 85 °C, and altitude up to 2000 m — covers most commercial and light industrial environments.