It's a line protection version — meaning it's built for feeder and distribution circuits, not motor-starting duty. The 121 kA breaking capacity at 240 V AC is what you look at first for high-fault panels; at 415 V it still holds 75.6 kA, and it's rated up to 690 V AC operating voltage. That's a serious interrupting rating for a 25 A frame.
At 415 V it's 75.6 kA; at 440 V the same; at 500 V it drops to 52.5 kA; at 690 V it's 3 kA. That last figure tells you this breaker is not for 690 V distribution unless your available fault current is very low. For most 480 V panels in North America or 400 V in Europe, the 75.6 kA rating covers high-capacity transformer feeds.
Current rating and thermal performance
That's unusual for a 25 A frame; most breakers start stepping down at 50 °C. The power loss is only 0.84 W maximum, so heat buildup in a dense panel is minimal.
Dimensions are 105 mm wide, 181 mm tall, and 86 mm deep — a standard 3-pole MCCB footprint for the SENTRON 3VA platform.