The Siemens 3VA2010-6HL32-0AG0 is a 3-pole SENTRON molded case circuit breaker rated for 100 A continuous current across the full 40 °C to 70 °C ambient range — no derating needed as the panel warms up. Its adjustable thermal-magnetic trip unit covers 150 A to 1 200 A, so you set the instantaneous pickup to coordinate with downstream branch breakers. The built-in trip indicator and auxiliary switch (1 auxiliary + 1 trip alarm) give the PLC or BMS a hard contact on fault events, which speeds root-cause isolation on a down line.
Max power loss is 13.5 W, so internal cabinet heating stays manageable; no forced ventilation required in a typical 600 mm × 800 mm enclosure.