The Siemens SENTRON 5SL6616-7 is a 4-pole (3P+N) miniature circuit breaker rated 16 A with a C-curve trip characteristic, designed for 400 V AC three-phase residential and infrastructure panels. Its 6 kA breaking capacity per EN 60898 (and matching 6 kA per IEC 60947-2) covers standard fault levels in most building distribution boards — enough for a lighting submain or a small pump circuit, but not for high-fault industrial switchgear where you'd look for 10 kA or higher.
The 5SL6616-7 occupies 4 modular width units (72 mm wide) on a standard DIN rail, with a depth of 76 mm and an installation depth of 70 mm behind the panel face. It mounts in any position, which simplifies layout in crowded enclosures. Sealable design (padlockable toggle) allows lockout/tagout on the breaker handle.