For AC-3 (squirrel-cage motor starting), the power rating is 4.5 kW at 500 V and 5.5 kW at 690 V, which covers a 7.5 hp motor on a 480 V system. The AC-4 inching/plugging rating is 8.5 A at 400 V, so if your application does frequent reversing or jogging, that's the current limit per operation. The maximum operating current in AC-12 (resistive load) is 10 A, which is the ceiling for general-purpose switching of heaters or lighting banks. The main circuit uses spring-loaded terminals accepting 2x (0.25... 2.5 mm²) solid or stranded, or 2x (24... 14) AWG — no screw torque to verify, which saves time on the wireman's side.
Coil and Control Circuit Details
The auxiliary contact block has one instantaneous contact (NO or NC depending on variant).
This matters when you're specifying the branch circuit protection for a motor starter combination.
Side-by-side mounting is permitted with 6 mm spacing at the side, so you can pack contactors tightly on the rail.