The 3VA2010-5HN36-0AG0 is a Siemens SENTRON 3-pole molded case circuit breaker rated for 100 A continuous current at 40 °C through 70 °C — no derating needed across that full ambient span, which simplifies panel sizing in warm enclosures. Its interrupting rating hits 187 kA at 240 V AC, 121 kA at 415/440 V, and 75.6 kA at 500 V, so it handles high-fault-capacity service entrance or distribution points without cascading upstream. The basic switch assembly is order code 3VA20105HN360AA0, which is the switching mechanism inside this frame.
The 3-pole block occupies roughly 105 mm of DIN-rail or mounting-plate width. Power loss is 13.5 W maximum at rated current, so adjacent devices need reasonable air gap or the panel's thermal budget accounts for that dissipation.