The Siemens 5SU9156-7VK06 is a SENTRON RCBO — a combined RCD and MCB in one 2-module-wide (36 mm) package, 1P+N, rated 6 A with Type A fault current sensitivity (30 mA typical for this class). Breaking capacity is 6 kA per EN 60898 and 10 kA per IEC 60947-2, so it clears line-to-neutral faults up to that level on a 230 VAC supply at 50 Hz.
Snaps onto DIN rail EN 60715. Depth is 77 mm, installation depth 70 mm — check your enclosure depth before committing. Mounting position any, so it works upright, sideways, or inverted in a crowded panel. Touch protection is built in (fingertip-safe terminals).
Thermal derating and environment
Rated 6 A at 30 °C ambient. Derate continuously: 5.64 A at 40 °C, 5.46 A at 45 °C, 5.22 A at 50 °C, 4.86 A at 55 °C. If your panel runs hot (e.g., 45 °C inside), plan for the lower figure. IP20 with distribution board installed and conductors connected.