What this MCCB is and what it does
The Siemens 3VA2110-5HN32-0DC0 is a SENTRON molded case circuit breaker (MCCB) rated for 100 A continuous current across the full ambient range from 40 °C to 70 °C — no derating needed up to that ceiling. It's a 3-pole unit built for line protection, meaning it sits at the feeder or main distribution point in a panel, not on a motor branch. The interrupting ratings are substantial: 187 kA at 240 V, 121 kA at 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. That 187 kA figure at 240 V tells you this breaker handles high available fault current without cascading upstream — it's sized for a main or a large subfeed where the transformer can dump serious energy.
Panel fit and integration
Dimensions are 181 mm high, 105 mm wide, 86 mm deep. That 105 mm width is three pole spaces wide on a standard DIN-rail or panel-mount footprint — it occupies the same slot as a typical 3-pole MCCB in a SENTRON distribution board. An undervoltage release (UVR) is built in, so if your safety circuit or upstream contactor drops out, this breaker trips. It also carries two auxiliary switches (HQ design) for status feedback to a PLC or annunciator. The supplied basic switch is order code 3VA21105HN320AA0 — that's the internal switching mechanism; the complete breaker is what you order here.
What the ratings mean for your panel
The 100 A rating is flat from 40 °C to 70 °C ambient — that's unusual for an MCCB; many competitors start derating above 40 °C. If your panel runs hot (say 55 °C inside a NEMA 12 enclosure), this breaker still delivers the full 100 A. Power loss is 12.5 W maximum, which is modest for a 100 A frame — helps keep internal cabinet temperature down. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. No communication function on this variant, no ground-fault monitoring — it's a straight thermal-magnetic line protection breaker with undervoltage release and auxiliary contacts.