The Siemens 5SY5425-7 is a 4-pole miniature circuit breaker from the SENTRON family, designed for universal current operation (AC/DC) and rated at 400 V AC (multi- and single-phase) with a C tripping characteristic. It carries a 10 kA breaking capacity per IEC/EN 60898-2 and a 15 kA rating per IEC 60947-2 at DC, making it suitable for branch-circuit protection in distribution boards and control panels where moderate inrush currents — typical of motor starters, contactor coils, and lighting banks — are expected.
Rated for 400 V AC (multi-phase) and 440 V AC (single-phase), with a DC operating voltage up to 1,000 V. The 10 kA breaking capacity at AC per EN 60898-2 means it can safely interrupt a fault current up to that level without welding contacts or cascading upstream; the 15 kA DC rating per IEC 60947-2 gives additional headroom for DC bus protection in industrial supplies.
Mounting and integration into a panel
Depth is 76 mm (installation depth 70 mm), so it fits standard 100 mm deep distribution boards with room for wiring.
Rated for ambient temperatures from -40 °C to 75 °C, with a derating curve above 55 °C (95% humidity up to 55 °C, 55% up to 70 °C, 35% up to 75 °C). Halogen-free and silicon-free construction, which matters for installations in clean rooms, semiconductor fabs, or areas with sensitive electronics where outgassing can cause contact corrosion. Vibration resistance per IEC 60068-2-6: ±1 mm at 5 to 25 Hz, 50 m/s² at 25 to 150 Hz — sufficient for mounting on machinery or in mobile equipment.