It's a 3-pole unit rated 16 A continuous at 40 °C, and it holds that 16 A rating all the way up to 55 °C before derating to 15 A at 60 °C and above. That's a solid thermal curve for a panel that runs warm; you don't lose headroom until the ambient passes 55 °C.
Breaking capacity — the real selection number
The interrupting rating is the headline here: 121 kA at 240 VAC, 75.6 kA at 415 VAC, 52.5 kA at 440 VAC, and 11.9 kA at both 500 V and 690 VAC.
The depth at 70 mm means it clears most standard enclosure depths with room for wiring behind the breaker.
What's on the nameplate vs what's inside
The supplied basic switch is order code 3VA11964EF320AA0 — that's the internal mechanism. The breaker has a trip indicator (mechanical flag) and a voltage trigger for the shunt trip. The -25 °C lower operating limit means it's fine for unheated electrical rooms in temperate climates, but not for direct outdoor installation in freezing conditions without a heater.