What the ratings mean for fit
The Siemens 3VA2110-5HN46-0AA0 is a 4-pole SENTRON molded case circuit breaker rated for continuous 100 A across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. Interrupting capacity hits 187 kA at 240 V and still holds 121 kA at 415 V and 440 V, which puts it squarely in the high-fault category for transformer secondaries, large motor control centers, or main feeders where SCCR requirements are stiff. At 690 V the rating drops to 3.7 kA, so verify the available fault current if the breaker lands on a 690 V bus. The ETU350 electronic trip unit gives adjustable overload and short-time delay curves — line protection version, so it's tuned for distribution feeders rather than motor branch circuits. No undervoltage release, no shunt trip, no communication module onboard; this is a straight thermal-magnetic replacement path for anyone moving from a fixed-trip MCCB to an electronic trip platform.
Panel fit and integration
Dimensions are 140 mm wide by 181 mm tall by 86 mm deep — standard 4-pole MCCB footprint for the 3VA frame. The front face carries IP40 protection, meaning it's splash-safe in a closed panel but not washdown-rated. Neutral conductor protection is adjustable via the trip unit (OFF, 50%, 100%), which matters for 4-wire systems where you need to coordinate the neutral pole with the phase poles.