It mounts directly onto a contactor (size S0) and provides Class 10 trip protection, meaning it will open the circuit within 10 seconds at 7.2× the current setting — fast enough to protect standard induction motors from sustained overloads without nuisance tripping on startup inrush. The adjustable current response range is 14 to 20 A, covering a common band for small to medium three-phase motors on 400 V or 480 V systems. At the top of the range, the relay handles a rated operational current of 20 A at up to 690 V, 50/60 Hz.
The Class 10 trip characteristic is the critical parameter for motor protection: it coordinates with standard motor starting curves so the relay does not trip during a normal start (typically 5–8 seconds of inrush) but still clears a locked-rotor condition quickly. The adjustable range of 14–20 A lets you dial in the exact full-load current of the motor, which is the number on the motor nameplate — not the breaker rating. Size S0 means this relay physically matches the S0 contactor frame (45 mm wide, 85 mm deep, 85 mm tall). It fastens directly onto the contactor without extra brackets, saving DIN-rail space. Termination is screw-type for both main and auxiliary circuits, accepting 2× (0.5–1.5 mm²) solid/stranded or 2× (0.75–2.5 mm²) with ferrules. Tightening torque is 2–2.5 N·m — a standard driver setting, no special tooling required.
This relay mounts directly onto the S0 contactor (e.g., 3RT1017 or 3RT1024 frames) and connects the main power circuit through the contactor's load terminals. It requires 6 mm of spacing to grounded parts on the side — plan for that clearance in the enclosure layout. The auxiliary circuit provides a normally closed and normally open contact for signaling the overload condition to a PLC or to drop out the contactor coil. Manual or automatic reset is selectable on the device, giving the commissioning engineer flexibility for attended vs. unattended operation. The relay is rated for 0–90% relative humidity (non-condensing) and shock resistance of 8 g / 11 ms per IEC 60068-2-27 — suitable for industrial environments with vibration from conveyors or compressors.
The relay carries a rated impulse withstand voltage of 6 kV and an insulation voltage of 690 V at pollution degree 3, meeting IEC requirements for industrial control panels.