It snaps onto a 35 mm DIN rail per DIN EN 60715 or screws down, and it's rated for 10 A at 24 VDC on the main contacts — that's the DC-1 resistive load curve.
Mount it standing on a horizontal surface. Keep 10 mm free above and below, 6 mm to the side, and 10 mm in front for arc clearance — the arcing time runs 10 to 15 ms, so that gap keeps the arc from tracking to the panel wall. The 45 mm width leaves room for a contactor-and-overload pair in a standard 200 mm wide enclosure.
Coil and switching performance
Coil pickup is 0.8 of rated voltage, dropout around 18 V. The DC switching time is 7 to 13 ms — fast enough for most motor starts but not so fast it causes nuisance dropouts on a sagging bus.