The 3RB1262-0LB01: The 200-820 A range puts this relay squarely in the heavy motor protection zone — think large conveyors, crushers, pumps, and compressors on 400 V or 690 V mains. The S10/S12 frame is a busbar-mount design, not a DIN-rail clip-in, so it integrates into a panel bus system or individual mounting plate.
We source it against an RFQ; confirm the quantity and desired condition (NIB vs. tested pull) before committing the line.
The 200-820 A continuous current range is the headline spec — it sets the motor FLA (full-load amps) the relay protects. The adjustable trip class (5...30) lets you match the relay's thermal curve to the motor's starting profile: Class 5 for fast-starting loads like fans, Class 20 or 30 for high-inertia loads like crushers or centrifuges. Setting it wrong means nuisance trips or inadequate protection. The DC 24 V control circuit powers the relay's reset and signaling functions. The manual-automatic-remote reset options give flexibility: manual for commissioning, automatic for unmanned stations, remote for PLC-controlled reset sequences. The bistable outputs hold state on power loss — critical for fault memory in safety circuits. Ground fault signaling is integrated — the relay detects current imbalance between phases and signals a ground fault condition. This is a separate output from the overload trip, so you can wire it to a distinct alarm or PLC input.