The Siemens SENTRON 5SJ4125-7HG41 is a 1-pole miniature circuit breaker rated 25 A at AC with a C tripping characteristic, per the datasheet. Rated current holds at 25 A up to 40 °C ambient; above that it derates linearly to 22 A at 60 °C. Pollution degree 3 and overvoltage category 3 mean it's rated for the industrial environment — conductive pollution and transient overvoltages up to 4 kV are within spec.
Mounting and fit
IP20 with connected conductors, IP40 in the handle area — fine for enclosed panels; not rated for washdown. Sealable, halogen-free, silicon-free — relevant for clean-room or corrosive-environment installs where outgassing matters.