The Siemens 5SJ6116-7RC is a SENTRON retail-line miniature circuit breaker — a 1-pole, 16 A, C-curve unit rated for 6 kA breaking capacity per EN 60898 at 240 V AC. The single-module width (18 mm) means it snaps into any standard DIN-rail panel, and the 76 mm depth fits flush in shallow enclosures.
The 6 kA breaking capacity per EN 60898 is the key coordination number — it tells you this breaker can safely interrupt a fault current up to 6,000 A at 240 V AC without welding its contacts or failing catastrophically. That's adequate for most retail and commercial sub-distribution boards fed from a transformer of typical impedance, but it won't hold up on a high-capacity industrial bus where the prospective short-circuit current exceeds 6 kA. Rated for 240 V AC single-phase operation, with a maximum of 440 V AC in multi-phase configurations, so it can sit on a 230/400 V three-phase panel as a single-pole branch protector. Sealable design means you can lock the toggle with a seal wire to prevent unauthorized reset, a common requirement for retail or public-access panels.
Single-module width (18 mm) — one slot in a distribution board. Depth of 76 mm with 70 mm installation depth means it clears most shallow enclosures. Mounting position any — horizontal, vertical, upside-down; no derating needed for orientation. The terminal design accepts supplementary devices like shunt trips or auxiliary contacts, so you can add remote trip or status feedback without swapping the breaker.