The ETU550 electronic trip unit handles the overcurrent release — that's the brain that decides when to clear a fault. This is a communicating breaker; it has a communication function on board, so it can talk to a higher-level control system for monitoring and coordination.
The interrupting ratings tell you what faults this breaker can safely clear at different voltages: 187 kA at 240 V, 121 kA at 415 V and 440 V, 79 kA at 500 V, and 4.25 kA at 690 V. At 690 V the number drops sharply — that's the physics of arc extinction in air. If your system fault current at 690 V exceeds 4.25 kA, this breaker isn't your choice; you'd need a higher-rated frame. The continuous current holds at 100 A from 40 °C through 50 °C ambient, then derates to 96.25 A at 55 °C, 92.5 A at 60 °C, 88.75 A at 65 °C, and 85 A at 70 °C.
The auxiliary contact version ships with 2 auxiliary switches HP built in, so you get remote status without adding a separate module.
The SENTRON 3VA series carries the usual suite of compliance docs: RoHS, REACH, and the CE marking for the European market. UL and IEC certifications are standard for this product class. Documentation — datasheet, manual, CAD files — is available from Siemens on request.