The Schneider Electric A9D73620T is an Acti9 ISPN Vigi RCBO — a combined residual current device and miniature circuit breaker in a single 18 mm wide module. It protects a single-pole-plus-neutral outgoing circuit against both overloads/short-circuits (thermal-magnetic trip, C-curve, 20 A rated) and earth leakage (30 mA sensitivity). The 6 kA breaking capacity at 230/240 V AC 50 Hz is sized for residential and light commercial distribution boards in TN earthing systems, where fault levels stay under that threshold.
The C-curve magnetic trip operates between 5 and 10 times In (100–200 A instantaneous), which suits mixed resistive-inductive loads like lighting, socket outlets, and small appliances — not motor starting, where a D-curve would be needed. The 30 mA earth-leakage threshold provides personal protection against direct contact; it is the standard sensitivity for final circuits in most domestic and commercial codes.
Clip-on mounting to DIN rail (35 mm, per EN 60715). The 18 mm width (2 x 9 mm pitches) means it occupies one standard module position in a distribution board — plan fill factor accordingly. Neutral is on the left; upstream and downstream tunnel terminals accept 1–25 mm² rigid or 1–16 mm² flexible conductors. Tightening torque: 3.5 N·m upstream, 2 N·m downstream. Wire stripping length: 14 mm upstream, 13 mm downstream. Padlockable with a Ø 4 mm padlock for LOTO isolation. IP20 finger-safe when installed in an enclosed board.