It's the part that sits between the contactor and the motor — watches the current draw, trips if the motor pulls too long. Adjustable current response from 0.7 A up to 1 A, Trip Class 10, meaning it'll clear a stall before the windings cook. For a small motor — fractional to about 0.37 kW at 400 V — this is the right thermal partner.
Mounting and wiring reality
Fastens directly onto the contactor. S00 frame size mates with S00-frame contactors. Screw terminals for main and aux circuits.
Rated operational current is 1 A — that's the continuous motor FLA this relay is designed to protect at the top of its adjustment range. The 0.7–1 A window lets you dial in the exact trip point for the motor nameplate. Rated insulation voltage 690 V, surge withstand 6 kV — fine for 400 V line supplies. Shock rated at 8 g / 11 ms per IEC 60068-2-27, which covers most industrial vibration environments.