What it is and what it does
The Siemens SENTRON 3VA2110-6HN32-0BH0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current at up to 50 °C ambient, with the ETU350 electronic trip unit handling line protection. That 100 A holds flat from 40 °C through 50 °C — no early derating — then steps down to 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. The interrupting ratings are substantial: 242 kA at 240 V, 187 kA at 415 V and 440 V, 121 kA at 500 V, and 5 kA at 690 V. That 242 kA at 240 V means it can safely clear a fault up to that level without the arc flashing over or the case rupturing — critical for high-fault-capacity panels feeding motor control centers or large transformer secondaries.
Panel fit and integration
The 3VA2110-6HN32-0BH0 measures 105 mm wide, 181 mm tall, and 86 mm deep — that 86 mm depth is the dimension that matters when you're laying out the gland plate or checking clearance behind a swing-panel door. It mounts on a DIN rail or directly to a backplate; the 105 mm width is three pole spaces at 35 mm per pole, so it occupies the same footprint as a standard 3-pole MCCB in the SENTRON 3VA frame. The auxiliary contact block is already integrated: 2 auxiliary switches plus 1 trip alarm switch (HQ type), so you don't need to add a separate side-mount module for status feedback to the PLC or annunciator panel.
What the ratings mean for your panel
The 242 kA interrupting rating at 240 V is the headline number for high-fault panels — it means this breaker can safely interrupt a fault current up to that level without the arc escaping the case, which is what lets you use it downstream of a large transformer without needing a current-limiting fuse upstream. The 800 V rated insulation voltage (Ui) tells you the internal creepage and clearance are designed for 800 V systems, so it's suitable for 480 V and 600 V class panels with margin. The 12.5 W maximum power loss is the heat it dumps into the enclosure at full load — that's the number the thermal engineer uses to size the cabinet ventilation or cooling. The latching endurance of 20 000 operations means the mechanical mechanism is rated for that many close-open cycles before wear-out; for a main breaker that cycles once a day, that's about 55 years of service life.