The Siemens SENTRON 3VA2010-6HN36-0CC0 is a 3-pole molded case circuit breaker rated for 100 A continuous current at 40 °C through 50 °C, with a thermal derating curve that drops to 85 A at 70 °C. Breaking capacity hits 242 kA at 240 V, 187 kA at 415 V, and 121 kA at 500 V; at 690 V it still clears 4 kA. That puts it squarely in high-fault-current distribution panels — think main or feeder breakers downstream of a large transformer, not branch protection for a motor starter. The 105 mm width, 181 mm height, and 86 mm depth fit the standard SENTRON 3VA mounting footprint — same bolt pattern as the rest of the 3VA2 frame family. An undervoltage release is built in (the basic switch is 3VA2010-6HN36-0AA0, and the integrated auxiliary trip is 3VA9608-0BB24). Two high-quality auxiliary switches come factory-fitted, so you don't need to add a side-mount block for status feedback.
Above 50 °C you lose 3.75 A per 5 °C step, so if your panel ambient runs 60 °C, plan for 92.5 A max. That's typical for a main breaker on a 2,000 kVA transformer secondary. The ETU350 trip unit is adjustable; you set the long-time, short-time, and instantaneous pickup to coordinate with downstream breakers.