The Siemens SENTRON 5SL6215-7CC is a 2-pole miniature circuit breaker rated 1.6 A with a C tripping characteristic, designed for 400 V AC residential and infrastructure branch circuits. At 1.6 A it covers low-current lighting strings, control transformers, or signal power supplies — not motor feeders.
Mounting position is unrestricted, so horizontal or vertical busbar feeds work equally.
For commercial or industrial panels where the prospective short-circuit current exceeds 6 kA, you need the 10 kA variant (5SL4363-7) or a current-limiting upstream fuse. The 1.6 A rating is low; verify your minimum fault current is above the magnetic trip threshold (8 A to 16 A for C-curve) or the breaker may not trip fast on a high-impedance fault. The -40 °C to 75 °C operating range covers unheated utility rooms and attic-mounted panels in most climates.