The AC-4 rating at 400 V is 8.5 A — that's the switching capacity for reversing or inching duty where the contactor makes and breaks motor current under load. The contactor is rated for operation at altitudes up to 2,000 m without derating, and the operating temperature range is -25 to +60 °C. The width is 45 mm and depth is 72 mm, so it occupies a single 45 mm slot on the rail. The front face is rated IP20, meaning finger-safe but not protected against moisture ingress.
This class of contactor is used in motor control centers, pump panels, conveyor drives, and general switching of resistive or inductive loads up to 5.5 kW at 690 V (AC-3 duty).