What this MCB is and what the ratings mean
The Siemens 5SL6306-7RC is a 6 A, 3-pole miniature circuit breaker from the SENTRON family, with a C tripping characteristic and a 7.5 kA breaking capacity rated per EN 60898 at 415 V AC. The C curve means it tolerates brief inrush currents 5 to 10 times the rated current — standard for mixed resistive and light inductive loads like lighting circuits, small transformers, and general socket outlets in residential or light commercial distribution boards. The 7.5 kA short-circuit capacity is the maximum fault current it can safely interrupt at the rated voltage; for panels fed by a transformer with higher prospective fault current, you'd need a current-limiting upstream device or a breaker with a higher kA rating.
Integration and panel fit
Occupies 3 modular width units (54 mm total) on a DIN rail, with a depth of 76 mm and an installation depth of 70 mm. Mounting position is any — no derating required for upside-down or sideways installation in a tight enclosure. IP20 with connected conductors, so it's protected against finger contact but not washdown; install inside a distribution board or enclosure rated for the environment. Sealable, halogen-free, and silicon-free — important for environments where outgassing or silicone contamination matters (e.g., near sensitive contacts or in clean-ish industrial zones).