What the ratings mean for fit
The Siemens 3VA2110-5HN32-0AF0 is a SENTRON molded case circuit breaker (MCCB) in the line protection version, rated for 100 A continuous current (Iu) at 40 °C. It carries an ETU350 electronic trip unit — that's the brain that handles the trip curve, adjustable for the load. The 187 kA interrupting rating at 240 V tells you this breaker can safely clear a fault up to that level without welding its contacts or cascading failure upstream; at 415 V it still holds 121 kA, and at 690 V it drops to 4.25 kA, which is typical for a 3-pole unit at that voltage. The 800 V rated insulation voltage (Ui) means the internal clearances are designed for 800 V systems, so it's fine on 480 V or 600 V class panels. The 3-pole construction fits three-phase feeders — motor control centers, distribution panels, main incoming breakers.
Deployment context
Mounts on a DIN rail or panel-mount in a standard enclosure. The 105 mm width and 181 mm height fit the SENTRON 3VA frame footprint — it occupies the same cutout as other 3VA2 frame breakers. The front face carries IP40 protection (finger-safe), so it's suited for indoor switchgear and panelboard installation where dust ingress isn't a concern. The auxiliary contact configuration — 1 auxiliary switch + 1 trip alarm switch (HQ type) — means you get a separate signal for breaker position and a separate one for fault tripping, which simplifies wiring back to a PLC or status lamp.