What it is and what it does
The Siemens 5SU1354-0KK06 is a SENTRON RCBO — a combined residual-current device and miniature circuit breaker in a single 2-module-width (36 mm) package. It protects a 1P+N final subcircuit at 6 A rated current, B-curve tripping characteristic, with 30 mA Type AC residual-current protection. The 10 kA breaking capacity per EN 60898 covers the domestic and light commercial panel; the 35 kA rating per IEC 60947-2 gives headroom for industrial distribution where the prospective fault current is higher. That dual standard means it coordinates downstream of a larger upstream breaker without needing a current-limiting device in between.
Fit and panel integration
Two modular width units (36 mm) on a DIN rail, 77 mm deep, 90 mm tall. Installation depth is 70 mm behind the panel face. Mounts in any position. Supply can enter from top or bottom — no orientation restriction. Rated IP20 once the distribution board is closed and conductors are connected; that's standard for a DIN-rail device inside a cabinet, not for an open panel. Halogen-free and silicon-free construction, which matters in clean-room or high-reliability environments where outgassing is a concern.