What this MCB does on the rail
The Siemens 5SL4415-7 is a 4-pole miniature circuit breaker from the SENTRON 5SL4 series, rated 1.6 A with a C tripping characteristic. The 400 V AC rating covers standard three-phase panel feeds; the 440 V maximum on multi-phase operation gives a little headroom for lightly loaded transformers or long feeders.
The screw terminals accept solid or stranded conductors from 0.75 to 25 mm², torqued to 2.5–3 N·m.
What the C-curve and ratings mean for your load
The C-curve trips at 5–10 times rated current, so the 1.6 A breaker holds through motor inrush or capacitive loads up to about 16 A before opening.