What it is and what the ratings mean for fit
The Siemens 3VA2025-6HL32-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 25 A continuous current with a 3-pole configuration and an ETU320 electronic trip unit. The 242 kA breaking capacity at 240 V tells you this thing will clear a massive fault without turning into a fireball — it's sized for high-available-fault-current panels where a standard MCB would weld shut. At 415 V it still breaks 187 kA, so it handles the main feeder or a big motor branch where the transformer is right next door. The 25 A rating holds steady from 40 °C all the way up to 70 °C ambient — no derating curve to chase in a hot enclosure. That's unusual for a breaker this size; most start dropping current above 40 °C. The ETU320 release gives you adjustable long-time, short-time, and instantaneous pickups, so you can coordinate selectively downstream without nuisance tripping on motor inrush.
Where it goes and how it fits
This MCCB snaps onto a DIN rail or mounts directly to a backplate in a panel. The 105 mm width is a standard 3-pole footprint — it'll drop into the same slot as most SENTRON 3VA family breakers without rewiring the bus bars. Depth is 86 mm, so it clears a 120 mm deep enclosure with room for wiring gutters. IP40 on the front means it's fine in a clean indoor panel; keep it out of washdown zones.