It is a current-production part, actively sourced through independent distribution channels.
Any mounting position is permitted, so vertical or horizontal rail orientation is fine. Clearance requirements: 50 mm upwards, 50 mm downwards, 30 mm at the side, and 0 mm forwards and backwards. The 0 mm forward clearance means the breaker can be mounted flush against a panel door or cover without additional air gap. Main circuit terminals are spring-loaded (cage-clamp) type, accepting 2 × (0.5 to 2.5 mm²) solid or stranded wire. No screw torque to verify — strip to 8 mm and push in.