The Siemens SENTRON 3VA2010-5HL32-0HH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current Iu of 100 A up to 50 °C before derating begins — at 55 °C it still holds 96.25 A, and at 70 °C it delivers 85 A. That thermal curve means you can push it hard in a warm enclosure without oversizing, as long as you check the actual ambient against the derating steps. Breaking capacity is the headline: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 3.4 kA at 690 V. At 415 V the 121 kA still covers heavy industrial distribution panels. The overcurrent release is an ETU320 — a solid-state trip unit with adjustable settings (the base ETU320 provides LSI protection: long-time, short-time, and instantaneous).
Power loss is 13.5 W maximum — modest for a 100 A frame, so thermal management inside a sealed panel is manageable.