What this SIRIUS breaker does
That's fast enough to protect the transformer winding from sustained overload, but slow enough to ride through the magnetizing inrush pulse on energization.
Rated breaking capacity hits 100 kA at 240 V AC and 400 V AC, and holds that same 100 kA at 500 V AC and 690 V AC. That is a flat SCCR curve across the common industrial voltages — you get full fault-clearing ability without derating the interrupting rating at higher line voltages.
Mounting position is any orientation, so it works in horizontal or vertical DIN-rail layouts. Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward. Main circuit terminals accept screw-type connections, with solid or stranded wire: 2× (1 to 2.5 mm²) or 2× (2.5 to 10 mm²). Main contact screws are M4.