What this SIRIUS breaker does on the line
The 45 mm width (three module spaces) and 90 mm height fit standard distribution panels; 75 mm depth leaves room for wiring behind the rail. Any mounting position is allowed, so it tucks into tight enclosures without derating.
SCCR and selectivity — what the ratings mean
Rated short-circuit breaking capacity hits 100 kA at 240 V, 400 V, and 500 V — that's the fault current this breaker can safely interrupt without welding contacts or venting plasma. At 690 V it drops to 2 kA, so if your panel feeds a 690 V motor, verify the available fault current stays under that. The 100 kA figure at 400 V is the one that matters for most 480Y/277 V industrial services; it means the breaker can sit downstream of a transformer without needing a current-limiting fuse upstream for coordination.