D-curve 13 A — motor and transformer branch protection
Breaking capacity hits 10 kA at 400 V AC per EN 60898, and 5 kA per UL 1077 / CSA C22.2 No.235 — enough for most industrial panel sub-feeders where fault current stays under those thresholds. Rated operating voltage is 400 V AC (440 V max multi- or single-phase), with a DC rating of 72 V max — so it's a pure AC branch breaker; don't spec it for a DC bus.
Thermal and environmental limits
Relative humidity tolerance is 95% at 55 °C, derating to 35% at 75 °C — fine for most indoor industrial environments, but not rated for condensing atmospheres. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz — survives normal machine vibration; no special dampening needed in a standard control cabinet.
Siemens designates this breaker for mechanical engineering and industry applications — it's the go-to D-curve 13 A 2P for OEM panel builders and machine builders.