Breaking capacity — what the voltages tell you
Breaking capacity is the core selection parameter for an MCCB, and this one delivers 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. On a 480 V panel with a 65 kA available fault current, this breaker has headroom. On a 690 V drive input, the 11.9 kA rating is the limit to coordinate against. The 3VA series uses current-limiting technology to reduce let-through energy, which helps with downstream component protection.
That 3-inch (76.2 mm) width is the standard 3-pole MCCB footprint for the SENTRON 3VA platform — it occupies three 25 mm modular spaces on a DIN rail or mounts directly to a backplate. The IP40 front-face protection means it is splash-proof from the front but not sealed; install it inside a rated enclosure.