It uses a winding-type current transformer for sensing and is designed for direct contactor mounting on a 3RT105... contactor or as a standalone unit on 35 mm DIN rail. The manual reset keeps the operator in control after a trip event.
The 200 A maximum and class 10 trip curve tell you this relay is sized for moderate-to-large induction motors — think 90 kW to 110 kW at 400 V, depending on full-load current. The size S6 footprint is physically large; it matches the 3RT105 contactor frame, so verify panel depth and DIN-rail spacing before committing the BOM line.
Snaps onto a 35 mm top-hat rail. For contactor mounting, it bolts directly to the 3RT105... contactor.