The Siemens 5SU1356-1KK16 is a SENTRON RCBO — a combined residual-current circuit breaker with overcurrent protection — in a 1P+N, 2-module-width (36 mm) package for DIN-rail panels. It carries a 16 A rating at 30 °C ambient, with a Type C tripping characteristic (magnetic release between 5 and 10 times In) for moderate inrush loads like small motors or lighting banks. The interrupting capacity is 6 kA per EN 60898 and 15 kA per IEC 60947-2, covering most commercial and light industrial fault levels.
Ratings and derating
The 16 A rating holds at 30 °C; above that, the continuous current must be derated per the listed curve: 15.2 A at 40 °C, 14.88 A at 45 °C, 14.4 A at 50 °C, 13.92 A at 55 °C, 13.6 A at 60 °C, 12.96 A at 65 °C, and 12.32 A at 70 °C. If the panel ambient runs above 40 °C, size the branch circuit for the derated value, not the 30 °C label. Rated voltage is 230/240 V AC at 50 Hz. Insulation voltage (Ui) is 264 V, and surge voltage resistance is 4 kV, consistent with overvoltage category III and pollution degree 2 — standard for fixed-installation distribution boards.
Installation and integration
Mounts on a DIN rail in any position. The 77 mm depth and 70 mm installation depth fit standard enclosures. Supply can enter from top or bottom. Two modular width units (36 mm) occupy the rail. Halogen-free and silicon-free construction matters for environments where outgassing during a fault could damage sensitive electronics or contaminate clean-room surfaces.