The Siemens SENTRON 5SP9425-7KC47 is a 4-pole miniature circuit breaker rated 25 A with a C tripping characteristic, designed for 400 V AC / 50 Hz systems. Its 50 kA breaking capacity per IEC 60947-2 means it can safely interrupt fault currents up to that level without upstream cascading — critical for high-fault-capacity industrial panels where selectivity with upstream devices is a design requirement.
Ratings and fit
The C-curve (5–10× In magnetic trip) suits moderate inrush loads like motor starters, small transformers, and lighting banks — common in mixed-load distribution panels. The 4-pole version (4P) switches all three phases plus neutral, required for TN-S or TT systems where neutral isolation is needed. Solid and stranded conductors from 0.75 to 50 mm² (AWG 14–2) are accepted at the tunnel terminals, top and bottom. Terminal torque spec is 2.5–3.5 N·m (22–31 lbf·in). The 6 width units (approx. 108 mm on a DIN rail) and 92 mm installation depth fit standard 18 mm modular enclosures.
Deployment context
Mounts on standard DIN rail or via screw fixing; any mounting position is allowed. Ambient temperature range is –25 to +45 °C, with periodic excursions to +55 °C at 95% humidity. IP20 with connected conductors — suitable for enclosed panel use, not for wet or outdoor locations without a secondary enclosure.