At DC, the same 10 kA rating applies per EN 60898-2, with a maximum DC voltage of 500 V — note the polarity requirement on the supply cord. The 2-pole (2P) configuration switches both phase and neutral on a single-phase circuit, or two phases on a three-phase system where a 2-pole device is called for. The universal-current designation confirms it handles AC and DC without derating the breaking capacity — a useful trait for mixed-load panels or battery-backed circuits. Designed for railway applications, this breaker is halogen-free and silicon-free.
The 5SY5250-7KK11 mounts via a quick assembly system — the standard DIN-rail clip that snaps onto 35 mm symmetrical rail. At 36 mm width (2 width units,), it occupies two 18 mm module spaces on the rail. Both top and bottom are combined terminals. IP20 protection with connected conductors means the breaker is finger-safe once wired, but not protected against moisture ingress — it belongs inside a closed panel or enclosure, not in a washdown zone.
The surrounding temperature influence caps relative humidity at 95% up to 55 °C, then derates to 55% at 70 °C and 35% at 75 °C — relevant for sealed enclosures where condensation may form. The breaker is classified as energy limiting class 3, meaning it limits let-through energy (I²t) to a low level during a fault — this protects downstream wiring and devices from thermal damage. Touch protection is fitted, so live busbar connections are shielded when the breaker is removed from the rail.