This is a Siemens SIRIUS 3RV2711-0GD10 circuit breaker in the compact S00 frame size, designed for system protection under UL 489 and CSA C22.2 No. 5. It's the kind of breaker you'd spec into a motor branch circuit or distribution panel where you need a high fault-current rating — it carries 100 kA interrupting capacity all the way from 240 V up through 690 V AC.
Clearance requirements are 70 mm above and below, 30 mm to the sides, and zero forward clearance, so you can tuck it tight against a gland plate or back panel. Any mounting position works.
Terminals and wiring
The screwdriver spec is a Pozidriv size 2 tip with a 5-6 mm shaft diameter. Main contact terminal size is M4. That's a standard industrial panel wire range; no oddball metric that needs a special ferrule.
