The 100 kA breaking capacity at 240 V, 400 V, 500 V, and 690 V AC is the headline number — it tells you this breaker can clear a fault up to 100 kA at those voltages, which covers most industrial service-entrance and sub-distribution panels. The transformer-protection design means the thermal-magnetic curve is shaped to handle inrush without nuisance tripping, unlike a standard motor-protective breaker. The 97 mm depth and 45 mm width fit standard 45 mm-wide DIN-rail slots; the 97 mm height matches the SIRIUS 3RV2 family, so it aligns with adjacent contactors or overloads on the same rail.
The screw-type terminals on the main current circuit accept 2×(0.75 to 2.5 mm²) solid or stranded, or 2×4 mm² — fine for transformer primary wiring up to the rated current. Clearance requirements: 50 mm upwards and downwards, 30 mm at the side, zero forwards or backwards. That's tight enough for dense DIN-rail layouts but needs the vertical gap for arc-quenching.