The Siemens 5SY7625-8 is a SENTRON miniature circuit breaker rated 25 A at 400 V AC, 4-pole (3P+N), with a D tripping characteristic. The D-curve means it tolerates the high inrush currents typical of motor and transformer loads — the magnetic trip threshold sits at 10 to 20 times rated current, so nuisance tripping on startup is avoided. Breaking capacity is 15 kA per EN 60898 and 25 kA per IEC 60947-2, with a DC rating of 15 kA per IEC 60947-2. It occupies 4 modular width units (72 mm) on a DIN rail.
Breaking capacity and standard compliance
The 15 kA rating under EN 60898 covers the standard household/commercial installation curve; the 25 kA under IEC 60947-2 is the industrial rating, meaning this breaker can interrupt fault currents up to 25 kA at 400 V AC without welding its contacts or cascading failure upstream. The DC rating of 15 kA per IEC 60947-2 covers DC-side faults in rectified supplies or battery banks. UL 1077 and CSA C22.2 No. 235 recognition at 5 kA confirms suitability for North American supplementary protection applications.
Mounting and environmental fit
Snap-on mounting to DIN rail, any orientation. Depth is 76 mm, installation depth 70 mm, so it clears standard 80 mm deep enclosures. The 4 MW width (72 mm) means it occupies four 18 mm slots — plan your rail fill accordingly. IP20 with conductors connected; overvoltage category III, pollution degree 3, so it's rated for fixed installations in industrial panels where transient overvoltages and conductive dust are expected. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — suitable for machine-mounted panels.
Environmental and compliance documentation
Halogen-free and silicon-free construction, sealable for tamper-proofing. The combined terminal top and bottom accept the neutral conductor switching (3P+N). Ambient temperature range -40 °C to 75 °C, with humidity derating: max 95% RH at 55 °C, tapering to 35% RH at 75 °C. Compliance documentation (RoHS, REACH, UL, IEC) is available through the Siemens SENTRON documentation portal — the part carries the relevant CE, UKCA, and EAC markings for European and Eurasian markets.