That's enough headroom for most distribution panelboards fed from a 500 kVA transformer; you won't need a current-limiting upstream breaker unless the available fault current exceeds 36 kA. Rated per EN/IEC 60947-2, utilisation category A — it's a distribution breaker, not a motor-circuit protector. The 4-pole configuration with neutral on the left suits TN or TT systems where you want the neutral switched and protected. At 108 mm wide, 137 mm tall, 80 mm deep, it occupies 12 module pitches of 9 mm on a DIN rail — plan your enclosure layout accordingly.
At 16 A, it's sized for lighting panels, small distribution subfeeds, or control transformer primaries. Connection terminals are Everlink lugs — accepts 2.5 to 95 mm² rigid or stranded aluminium/copper, or 2.5 to 70 mm² flexible copper. That's a wide wire range for a 16 A breaker; you can land a 4 mm² feeder or a 70 mm² main, depending on your tap rules. Both upside and downside connections are front-facing, so the breaker can be wired without reaching around the back — helpful in tight enclosures.