It carries a continuous current rating of 25 A and uses the ETU310M electronic overcurrent release, which gives you an adjustable trip range of 75 A minimum to 375 A maximum — that's the short-circuit and overload protection window you set for the motor branch. Three-pole construction handles three-phase motor loads. The interrupting ratings are what make this part stand out: 440 kA at 415 V AC and 187 kA at 690 V AC. The operating voltage ceiling is 690 V AC, and the rated insulation voltage is 800 V, so it's comfortable on 400 V to 690 V line-to-line systems common in European and North American industrial plants.
Thermal performance and derating
The 25 A continuous rating holds flat from 40 °C all the way up to 70 °C ambient — no derating needed across that entire span. That's unusual for an MCCB; most thermal-magnetic breakers start derating above 40 °C. The ETU310M electronic trip keeps the threshold stable regardless of enclosure heat buildup, which matters when the breaker shares a crowded panel with drives or contactors that raise the internal temperature. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. Maximum power loss is 0.5 W — negligible for panel cooling calculations.
Dimensions: 105 mm wide, 181 mm tall, 86 mm deep. That 105 mm width is the standard 3-pole MCCB footprint for the 3VA2 frame — it drops into the same mounting cutout and bus-bar spacing as other 3VA2 three-pole units. If your panel was laid out for a 3VA2125-8KQ42-0AA0 or similar 3VA2 sibling, this 3VA2125-0MS32-0AA0 shares the same mechanical envelope; no rewiring or re-drilling needed at the mounting plate.