The Siemens 5SP9416-7KC47 is a SENTRON 5SP9 miniature circuit breaker, 4-pole, C-curve, rated 16 A at 400 V AC, with a 50 kA breaking capacity per IEC 60947-2. That 50 kA at 400 V means it can safely interrupt a fault current up to 50 000 A without upstream fuses needing to clear first — critical for high-fault panels close to the transformer. The C-curve (5–10× In) handles motor inrush and lighting loads without nuisance trips, while the 4-pole design switches all three phases plus neutral. Mounts on standard DIN rail or screw fixing, any position, with tunnel terminals top and bottom accepting solid or stranded conductors from 0.75 to 50 mm².
The 5SP9416-7KC47 occupies 6 width units (roughly 108 mm) on a standard DIN rail. Tunnel terminals top and bottom accept solid or stranded copper from 0.75 mm² up to 50 mm² — that 50 mm² top end lets you feed a main bus through the breaker rather than adding a separate terminal block. Tightening torque is 2.5 to 3.5 N·m (22–31 lbf·in). Ambient temperature range –25 to +45 °C, storage down to –40 °C. Shock and vibration tested per IEC 60068-2-27 and -6, so it holds up in transport and industrial floor conditions.