The Siemens 5SL6615-7 is a SENTRON 5SL6 series miniature circuit breaker — 4-pole 3P+N configuration, C-curve tripping characteristic, rated 1.6 A at 400 V AC.
The 1.6 A rating is low — this breaker is sized for small branch circuits, not main feeds. At 400 V AC three-phase, it protects a load drawing about 1.1 kW (assuming unity power factor). Four poles with switched neutral (3P+N) means the neutral is switched along with the three phases — required in some regional wiring codes and useful when you need full isolation of all conductors. The neutral pole is typically a late-make/early-break contact, so verify it's compatible with your load's neutral current (it's rated the same 1.6 A). Mounts in any position, snaps onto standard DIN rail. The 72 mm width (4 width units at 18 mm each) takes four module spaces in a distribution board.
Physical integration and environment
Dimensions: 90 mm height, 72 mm width, 76 mm depth. Installation depth is 70 mm — the extra 6 mm accounts for the terminal screws and wiring space behind the DIN rail. Sealable terminals are provided for anti-tamper or lockout/tagout requirements.