MCCB for high-fault panel positions
The Siemens 3VA2110-6HN36-0HC0 is a 3-pole SENTRON molded case circuit breaker rated for 100 A continuous current (Iu) with an ETU350 electronic trip unit. It's a line-protection device — no ground-fault monitoring, no communication module, no undervoltage release — just a straight MCCB with a shunt trip (STL) and two auxiliary switches (HQ) integrated. The interrupting ratings are the headline: 242 kA at 240 V and 187 kA at both 415 V and 440 V, dropping to 121 kA at 500 V and 5 kA at 690 V. That 242 kA figure at 240 V means it can sit on a transformer secondary or a high-capacity bus where fault currents are extreme — typical for a main or tie breaker in a large LV switchboard.
Thermal derating and panel fit
The breaker holds its full 100 A rating up to 50 °C ambient. Above that it derates linearly: 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C. For a panel with a 40 °C internal ambient — typical for a well-ventilated enclosure — you get the full 100 A. If the panel runs hot (say 55 °C), you lose about 4 A, which matters for continuous loads near the rating. Dimensions are 181 mm high, 105 mm wide, 86 mm deep — standard 3-pole MCCB footprint for the SENTRON 3VA2 frame. Mounts on a DIN rail or direct panel; the 105 mm width means three breakers fit a 315 mm section of a typical distribution board.