The Siemens SENTRON 5SY5125-7CC is a 1-pole miniature circuit breaker rated 25 A with a C tripping characteristic, designed for DC circuits up to 220 V and a breaking capacity of 10 kA per IEC 60947-2. That 10 kA rating means it can safely interrupt a fault current up to that level without welding contacts or cascading upstream — critical for DC bus protection in industrial control panels and machinery.
Mounting and panel fit
Snaps onto standard DIN rail via the quick-assembly system, occupying one width unit (18 mm). Depth is 76 mm, installation depth 70 mm, so it clears most 80 mm deep enclosures. Mounting position is any — no derating for horizontal or inverted orientation. IP20 with connected conductors, meaning it's protected against finger contact once wired, but not for wet or dusty environments.
Environmental and compliance
Rated for ambient temperatures from -40 °C to 75 °C, with humidity limits up to 95% at 55 °C. Halogen-free and silicon-free construction — important for sensitive electronics environments where outgassing can cause contact corrosion. Overvoltage category III, pollution degree 3, so it's suited for fixed installations inside industrial panels where transient overvoltages are common.