The S0 frame size handles motor loads up to the contactor's rated operational currents — 10 A at 24 V AC, 10 A at 230 V AC, 3 A at 400 V AC — so it's sized for smaller pumps, fans, and conveyor drives in a 400 V line.
Mounting and clearances — what the panel builder needs
That 97 mm depth and 60 mm width on a 102 mm height footprint fits the S0 slot common across the SIRIUS 3RT2 range.
Terminal wiring — spring-cage reality
Main circuit terminals accept solid 2x (0.5 to 2.5 mm²) or stranded 1 to 10 mm². The coil connection uses spring-type terminals.