It's a current-production part, still actively specified into new panels. Trip Class 10. Phase failure detection is included. That's enough for most industrial distribution panels fed by a transformer of 1000 kVA or less.
Width is 45 mm. Spring-loaded terminals accept 2 × (0.5 to 2.5 mm²) solid or stranded copper. Clearance: 50 mm needed above and below for arc venting and cable bending; 30 mm at the sides. Zero clearance forward or backward — you can butt it against other devices on the rail.
Environmental range
This is a current-production part.