What it is and what the key ratings mean
The Siemens SENTRON 3VA2110-7MS32-0AC0 is a 3-pole molded case circuit breaker (MCCB) in the starter protection version, rated for 100 A continuous current at 40 °C. That 100 A holds steady all the way up to 50 °C, then derates to 96 A at 55 °C, 94 A at 60 °C, 92 A at 65 °C, and 90 A at 70 °C — so in a hot panel you still have most of the capacity. The breaking capacity hits 330 kA at 240 V, 242 kA at 415 V and 440 V, 187 kA at 500 V, and 52.5 kA at 690 V. That 330 kA figure means it can interrupt a fault current up to that level without the arc flashing over, which is critical for high-fault installations like large motor control centers or transformer-fed switchboards.
Where it fits and how it connects
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — a standard MCCB footprint that mounts on a DIN rail or directly to a panel backplate. The front face carries an IP40 protection class, so it's fine in a clean enclosure but not for washdown areas. It ships with 2 auxiliary switches (HQ type) for status feedback to a PLC or indication lamp. The overcurrent release is an ETU310M electronic trip unit, which gives you adjustable thermal-magnetic curves for motor or feeder protection.