The 5SP9225-7KC47 is a Siemens SENTRON 5SP9 miniature circuit breaker (MCB) rated 25 A with a C tripping characteristic and a 50 kA breaking capacity at 400 V AC per IEC 60947-2. The C-curve (5–10× In magnetic trip) suits motor and transformer branch circuits where inrush is moderate; for purely resistive loads a B-curve would trip faster, but for lighting or small drives this is the right call. 2-pole configuration with 3 width units handles single-phase or two-phase loads up to 440 V AC. Rated frequency is 50 Hz.
Installation depth is 92 mm, so it fits shallow enclosures. Tunnel terminals top and bottom accept solid or stranded conductors from 0.75 mm² up to 50 mm² (AWG 14–2), with a tightening torque of 2.5–3.5 N·m (22–31 lbf·in). That 50 mm² top end is unusual for an MCB — it lets you feed a larger incoming cable and daisy-chain downstream, which saves a terminal block. The -40 to +75 °C storage range and -25 to +45 °C operating ambient cover most unheated electrical rooms. Shock resistance to 150 m/s² at 11 ms half-sine and vibration to 50 m/s² at 25–150 Hz means it holds up on a machine frame or in a mobile substation.