What it is and what it does
The Siemens 3VA2110-5HN32-0JH0 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 is a 3-pole, line-protection design with a shunt trip (STL) release and an auxiliary switch block carrying 2 auxiliary switches plus 1 trip alarm switch (HQ). The interrupting capacity is the headline: 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 at 240 V tells you this breaker is built for high-fault service entrances or large distribution panels where available fault current is extreme — not a branch feeder for a lighting panel.
Panel fit and physical integration
Dimensions are 105 mm wide by 181 mm tall by 86 mm deep. The 86 mm depth is the critical dimension for enclosure depth — it fits standard 200 mm deep enclosures with clearance for wiring and the shunt trip leads. Width at 105 mm is the standard 3-pole MCCB footprint; verify the mounting base pattern matches your existing backplate or DIN-rail adapter.
What the ratings mean for your choice
The 100 A rating is flat across the ambient range — no thermal derating curve to calculate. That simplifies panel design: if your load is 100 A or less and the ambient stays under 70 °C, this breaker holds. The 187 kA at 240 V is the SCCR (short-circuit current rating) at that voltage; it means the breaker can safely interrupt a fault up to 187 kA without catastrophic failure. At 690 V the rating drops to 3.7 kA, so if your system runs 690 V with high fault current, this is not the right breaker. Power loss is 10 W maximum — relevant for thermal management in a sealed enclosure. The shunt trip (STL) release allows remote tripping; the auxiliary switch block provides status feedback to a PLC or SCADA. No undervoltage release, no ground-fault monitoring, no communication function on this variant.