That's a standard feature on SIRIUS motor-protective breakers, not an add-on module.
The 45 mm width means it occupies one standard 45 mm-wide module slot on the rail — plan your panel fill factor accordingly. Depth is 97 mm, which fits most standard enclosures without a deep gland plate. Clearance requirements: 70 mm upwards and downwards, 30 mm at the side, 0 mm forwards and backwards. That 0 mm backwards clearance means it can sit flush against a back panel or busbar support. Terminals are screw-type for the main circuit, accepting 2x (1…2.5 mm²) or 2x (2.5…10 mm²) solid or stranded. Use ferrules on stranded for a reliable connection under vibration.