What this 100 A MCCB does on the line
The Siemens 3VA2010-5JQ32-0HH0 is a 3-pole SENTRON molded case circuit breaker rated 100 A continuous at 40 °C, with an ETU560 electronic trip unit that handles line protection. The 187 kA breaking capacity at 240 V means it can interrupt a fault current that high without welding contacts or cascading upstream — that's the figure that decides whether this breaker clears a high-fault panel or the main switchgear takes the hit. At 415 V and 440 V it still holds 121 kA, and at 690 V it drops to 3.4 kA, so the voltage class of your distribution determines which SCCR column you read.
Thermal derating and panel fit
The 100 A rating holds flat from 40 °C to 50 °C, then steps down: 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. If your panel ambient runs above 50 °C, the breaker still delivers 85% of its nameplate at the top of its operating range. Dimensions are 105 mm wide, 181 mm tall, 86 mm deep — standard SENTRON 3VA footprint for a 100 A frame, so it drops into the same DIN-rail or mounting-plate cutout as other 3VA100/200-series breakers. The auxiliary contact version ships with 2 auxiliary switches plus 1 trip alarm switch (HQ), and the shunt trip (STL) is integrated for remote tripping.