Part identity and what it does
It mounts directly to a contactor, saving DIN-rail space in the panel. For a pump or fan load on a standard across-the-line start, this is the correct class.
Rated surge voltage resistance is 6 kV, which aligns with IEC 60947-1 overvoltage category III for a 400 V industrial panel. That means the relay can withstand switching transients without internal flashover — important when the motor circuit shares a bus with VFDs or contactors. The relay carries ATEX certification DMT 98 ATEX G 001, so it is approved for use in potentially explosive gas atmospheres (Zone 1 or 2). If you are specifying for a petrochemical or gas-handling area, this is the documentation the inspector will ask for. Shock resistance is rated at 8g / 10 ms, which covers most industrial vibration environments — conveyor drives, compressor skids, and pump stations. No need for additional damping brackets in normal service. It belongs inside a cabinet rated to the environment, not on an open machine frame.
Fastening method is contactor mounting — the relay clips directly onto a SIRIUS S0 contactor (such as the 3RT1023 series), eliminating the need for separate DIN-rail space. This is the standard arrangement: the overload relay piggybacks on the contactor, and the entire motor starter occupies a single 45 mm width on the rail. Mounting position allows a vertical mounting surface with +/-135° rotation and +/-45° tilt to front/back. That gives flexibility in tight enclosures — you can rotate the assembly to route cables cleanly, as long as the relay stays within the tilt limits. Clearances: 0 mm upwards, forwards, backwards, and downwards; 6 mm to the side. That means the relay can be stacked flush vertically with adjacent devices, but needs a 6 mm air gap on the sides for heat dissipation.
Main and auxiliary/control circuits both use screw-type terminals. Main terminals accept 2x (0.5... 1.5 mm²) solid or 2x (0.75... 2.5 mm²) solid — equivalent to 2x (16... 12) and 2x (14... 8) AWG. Auxiliary terminals accept 2x (20... 16) and 2x (18... 14) AWG. Finely stranded conductors with ferrule are also supported per the listed cross-sections. Power dissipation per pole is 2.7 W. For a three-pole relay that is 8.1 W total heat to manage inside the enclosure. If the panel has multiple starters in a row, factor this into the thermal budget — especially in a sealed stainless steel cabinet with no fan.
Substance prohibition date per RoHS/REACH compliance is listed as 07/01/2006, indicating the part meets the European RoHS directive effective from that date. For cross-border shipments, this documentation is on file.