The 3RB1246-1PM01: The 1.25...6.3 A current range sets the motor FLA it can protect — size the relay so the motor's full-load amps fall within that window. The adjustable trip class (5...30) lets you match the thermal characteristic to the motor's starting profile: Class 5 for short acceleration times (e.g., unloaded conveyors), Class 10 for standard motors, Class 20 or 30 for high-inertia loads like fans or centrifuges. The AC 220...240 V control supply powers the internal electronics and the bistable outputs; ground-fault signaling is built in, so no separate module is needed for earth-leakage detection on the motor circuit.
Integration Notes
The relay clips onto a Size S00 or S0 contactor — no separate DIN-rail adapter required for the individual-mount variant. The screw terminals on the auxiliary circuit accept standard ferruled stranded wire; the main-circuit transformer is internal, so no external CTs. The bistable outputs latch their state on trip, which simplifies remote fault annunciation in a PLC-based panel.