The Siemens Betagard 5SL7225-8RC is a 2-pole miniature circuit breaker with a D tripping characteristic, rated 25 A and 15 kA breaking capacity at 415 V AC per both EN 60898 and IEC 60947-2. That 15 kA rating is the same under both standards, so it holds up for industrial fault levels without needing a separate current-limiting fuse upstream — one less thing to coordinate on a panel schedule.
D-curve means the magnetic trip fires between 10x and 20x In — 250 A to 500 A instantaneous. That's sized for transformer inrush, motor starting, or welding loads where a C-curve would nuisance-trip on the first half-cycle. If your circuit has a high inrush load that keeps popping a C-curve, this is the swap. Rated for 415 V AC, maximum operating voltage 440 V AC in single or multi-phase operation. Frequency 50/60 Hz. Power loss per pole is 2.4 W at rated current in hot state — 4.8 W total for the 2-pole unit. That's low enough to stack adjacent breakers without derating in a standard enclosure, but worth checking if you're packing 20+ breakers in a small sub-panel with no ventilation. Vibration resistant per IEC 60068-2-6. Sealable, halogen-free, silicon-free — suitable for environments where outgassing or contamination matters, like clean rooms or sealed enclosures near sensitive electronics.