What it is and what it does
The Siemens SENTRON 3VA2110-6HN32-0AG0 is a 3-pole molded case circuit breaker (MCCB) rated for 100 A continuous current and fitted with an ETU350 electronic trip unit. It's designed for line protection in distribution panels — the trip unit gives you adjustable thermal and magnetic curves, so you can dial in the coordination with downstream breakers instead of swapping fixed-trip hardware. Interrupting capacity runs 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's a lot of fault-clearing headroom — it'll handle a hard bolted fault on a 400 V bus without the upstream transformer breaker having to clear it.
Where it goes in the panel
Footprint is 105 mm wide, 181 mm tall, 86 mm deep. IP40 front keeps dust out of the trip-unit compartment. Comes with one auxiliary switch and one trip-alarm switch as standard — that's enough to signal the breaker's status and a fault trip back to the PLC without adding a separate contact block. No undervoltage release, no shunt trip, no ground-fault module on this variant; those are add-on accessories that clip into the same accessory slot.
Thermal limits and real-world current
Rated 100 A continuous up to 50 °C ambient. Above that it derates: 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 runs hot — say a packed enclosure with drives — you'll want to check the actual ambient at the breaker's location, not the room temperature. The ETU350's thermal memory also accounts for pre-load before a fault, so nuisance trips are less likely on a warm reclose. Maximum power dissipation is 10 W at rated load. That's low enough that you don't need forced ventilation for just this breaker, but if you're stacking several in a row, add up the watts and check the panel's thermal budget.