The Siemens 5SJ6425-7 is a SENTRON 5SJ6 series miniature circuit breaker — 4-pole, C-curve, rated 25 A at 400 V AC. Conductor termination accepts solid or stranded copper from 0.75 mm² up to 25 mm² — that covers everything from a 1.5 mm² lighting circuit tail up to a 6 mm² or 10 mm² feeder. IP20 with connected conductors is the normal protection level for a panel-mounted MCB; the touch-protection feature (finger-safe terminals) means an operator reaching into an open panel won't contact live metal.
Snap-on DIN-rail mounting, 4 width units (roughly 72 mm at 18 mm per unit). Vibration resistance rated at 50 m/s² from 25 to 150 Hz and 60 m/s² from 10 to 150 Hz per IEC 60068-2-6 — that's robust enough for installation near moderate industrial machinery but not for direct mounting on a high-vibration pump skid. The 4-pole construction (switching all three phases plus neutral) is the typical configuration for a three-phase distribution board or a sub-feed in a 400/230 V TN system.