Its AC-2 rating of 4 kW at 400 V covers slip-ring motor duty; the AC-4 rating of 8.5 A at 400 V handles reversing and inching applications where the contactor makes and breaks stalled-rotor current. The spring-loaded terminals on the main current circuit accept 2x (0.25 to 2.5 mm²) solid or stranded wire, which speeds wiring in high-density panels.
The 45 mm width and 60 mm height fit the S00 footprint; depth is 114 mm. IP20 protection on the front and terminals means it's suited for enclosed panels where no washdown or dust ingress is expected.
The AC-4 rating (8.5 A at 400 V) governs plugging and inching cycles; if your machine reverses or jogs frequently, this is the number that determines contactor life.