The AC-3 rating at 400 V is 4 kW, which covers a standard 4-pole induction motor up to that output; the AC-4 rating at 400 V is 8.5 A, for reversing or inching duty where the contacts make and break under load more often. The IP20 front protection is typical for panel-mounted gear; the terminals themselves are rated IP00, so the panel door or a terminal cover provides the final touch protection.
Coordination and wiring reality
For short-circuit protection, Type 1 coordination requires a 63 A gL/gG fuse; Type 2 coordination needs a 25 A gL/gG fuse. The difference matters for maintenance philosophy: Type 2 leaves the contactor usable after a fault, Type 1 may require replacement.
The auxiliary contact block (not included) mounts on the front; the contactor has two instantaneous auxiliary contact positions available. The 10 million mechanical cycles typical means it outlasts most motor starts in a production line before a rebuild is needed.