The Siemens SENTRON 3VA1112-6MH32-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated 125 A continuous at 40 °C, designed specifically for starter protection — meaning it's built to coordinate with motor starters and protect the branch circuit feeding a motor load.
This breaker delivers 220 kA at 240 V, 154 kA at 415 V, and 75.6 kA at 440 V — numbers that put it in the high-interrupting category for a 125 A frame. At 500 V and 690 V it still holds 7.5 kA, which is useful for industrial systems with higher fault currents upstream. That saves panel space and a fuse holder.
Thermal derating and temperature range
Rated 125 A from 40 °C up to 50 °C, then derates to 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. If your panel ambient runs above 50 °C, you lose about 1 A per 5 °C — plan the load accordingly. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit is wider because the breaker isn't carrying current — that's the handling limit, not the running limit.
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep. The 76.2 mm width is a standard 3-inch footprint for a 3-pole MCCB in this class — it fits common panel cutouts and busbar layouts. For a sealed panel, factor that into the thermal calculation.