It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 60715, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward and backward — useful when you're squeezing it into a tight gland plate layout.
The auxiliary switch is present and rated at 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.14 A at 440 V; at 230 V it's rated 0.75 hp. That covers most control voltages you'll see in a panel. Wire range for solid or stranded is 0.5 to 4 mm², and you can double up two conductors of that same range on the main contacts.
Dimensions: 45 mm wide, 70 mm high, 73 mm deep. Mechanical service life typical 30,000,000 operations. Power loss at 50 Hz and 60 Hz is 0.24 W — negligible for thermal budgeting.