The MGN911524 is a Schneider Electric Multi9 DPN Vigi RCBO — a combined overcurrent and earth leakage protection device for single-phase outgoing circuits. It's rated 20 A at 30 °C with a C curve (magnetic trip 5...10 x In), 1P+N configuration, and 30 mA AC-type earth leakage sensitivity. Breaking capacity is 4.5 kA Icn at 230 V AC conforming to IEC 61009-1. The 30 mA sensitivity covers personnel protection against direct contact, and the AC-type detection handles sinusoidal residual currents typical of standard AC circuits. Mounts on DIN rail, neutral on the left, with toggle control and ON/OFF indication.
Listed to GB 16917 and IEC 61009-1, which covers the combined overcurrent and residual current device standard for household and similar installations. The AC-type earth leakage protection (Class AC) detects sinusoidal residual currents only — it's not rated for pulsed DC or smooth DC fault currents that might appear on VFD-fed or rectifier-fed circuits. For those applications, an A-type or B-type RCD would be needed.