What this MCCB is and what it does
The Siemens 3VA1110-6MH32-0JH0 is a SENTRON molded case circuit breaker (MCCB) designed for starter protection — meaning it's built to sit ahead of a motor starter and handle the high inrush without nuisance tripping, while still clearing a fault fast. Rated 100 A continuous at 40 °C, it carries a 220 kA breaking capacity at 240 V, which drops to 154 kA at 415 V and 121 kA at 440 V; at 500 V and 690 V it's still rated 7.5 kA. That's a lot of interrupt capability for a 100 A frame — it'll hold coordination downstream without needing a current-limiting fuse ahead of it in most panels.
Ratings and what they mean for fit
Three poles, 800 V rated insulation voltage — this breaker handles 3-phase systems up to 690 V phase-to-phase. The 100 A rating holds flat from 40 °C to 50 °C, then derates to 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. If your panel ambient runs hot, you lose about 9 % at the top end; plan your load accordingly. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — that's a standard 3-pole MCCB footprint for a 100 A frame, so it'll drop into most existing SENTRON or competitive mounting bases without re-drilling the sub-panel.
Built-in accessories and wiring
This variant ships with a shunt trip (STL) for remote tripping, plus two auxiliary switches and one trip-alarm switch — that's enough to signal the PLC that the breaker has opened and whether it was a manual or fault trip. The basic switch inside is order code 3VA11106MH320AA0. No undervoltage release, no ground-fault monitoring, no communication module on this one — it's a straight electromechanical MCCB with a remote-trip coil. Power loss at rated load is 25 W max, so it won't cook the enclosure, but don't crowd it against other heat sources.