What this MCCB carries and where it fits
The Siemens 3VA2110-5HN32-0AE0 is a 3-pole molded case circuit breaker from the SENTRON family, rated for a continuous current of 100 A at 40 °C and carrying a breaking capacity of 187 kA at 240 V — that is the headline short-circuit rating that decides whether it clears a fault without upstream coordination issues. The ETU350 electronic trip unit gives adjustable overload and short-circuit protection curves, so it is suited for feeder or main breaker duty in distribution panels where you need selectivity with downstream breakers.
Breaking capacity across voltages — the real-world fault current
The interrupting rating drops with system voltage: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. That 4.25 kA figure at 690 V is the limiting case — if your panel feeds a 690 V motor drive, verify the available fault current stays under that level. The 121 kA at 415 V covers most European industrial distribution.
Thermal derating — don't size on the 100 A nameplate alone
The 100 A rating holds at 40 °C, 45 °C, and 50 °C. Above that it 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 the breaker sits in a sealed enclosure near other heat sources, use the 70 °C figure for sizing. The maximum power loss is 10 W, which is modest for a 100 A frame but still adds up in a crowded panel.
Panel fit and auxiliary contacts
Dimensions are 86 mm deep, 105 mm wide, 181 mm high — a standard SENTRON 3VA frame size that mounts on a DIN rail or panel-mount plate. The breaker ships with four auxiliary switches (HQ type) for remote status indication. The front face carries an IP40 protection rating, meaning it is protected against tools and small wires but not against water ingress; keep it inside the enclosure.