The SENTRON 5SY3016-6KV is a 1+N-pole miniature circuit breaker rated B 16 A, with a breaking capacity of 4.5 kA at 230 V AC.
At 70 mm depth and a single modular-width unit (18 mm), it fits standard distribution boards and sub-panels without crowding adjacent breakers.
For higher fault-current environments (e.g., industrial sub-distribution with larger transformers upstream), a breaker with a higher SCCR — such as the 5SY4140-7 rated 10 kA per EN 60898 — would be required.