The Siemens SENTRON 5SU1653-7KK06 is a 1P+N RCBO (residual current circuit breaker with overcurrent protection) in a 2-module-wide (36 mm) housing, rated 6 A with a C-curve trip characteristic. It switches the line and protects the neutral, with overcurrent detection on the line pole only. Rated 230/240 V AC at 50 Hz, it carries a 4.5 kA breaking capacity per EN 60898 and 25 kA per IEC 60947-2 — the higher figure matters when the device is used as a main or branch-circuit protector in an industrial panel where fault currents can exceed domestic levels.
Above that, derate linearly: 5.7 A at 40 °C, 5.4 A at 50 °C, 5.1 A at 60 °C, and 4.62 A at 70 °C. In a crowded enclosure with multiple breakers, the real-world continuous current may be lower than the label suggests — size the load accordingly.
Installation depth is 70 mm — the extra 7 mm accounts for the terminal screws. Mounting position is any, which helps in tight retrofit panels.