The Siemens 3RV2411-0CA15 is a SIRIUS-branded circuit breaker specifically designed for transformer protection — not a general-purpose motor protector or feeder breaker. That distinction matters: it's built to handle the inrush and fault characteristics of a transformer primary, with Trip Class 10 thermal overload response.
Screw-type terminals on the main circuit, accepting 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded copper. M3 terminal screws — standard screwdriver, no special tooling. The 97 mm depth and 97 mm height are compact enough for shallow enclosures. If you're retrofitting into a panel that had a 3RV2011-0AA10, the footprint and terminal layout are similar enough that you won't be redrilling the rail or re-terminating the whole bucket — just check the clearance above and below for the 50 mm requirement.