The Siemens 3RB1262-0LM00 is a solid-state overload relay from the SIRIUS 3RB12 series, sized for full motor protection in the 200...820 A range. It covers Class 5 through Class 30 tripping curves, so you can match the thermal memory to the motor's starting profile — short for pumps, long for high-inertia loads like centrifuges or crushers. The S10/S12 frame means it's a physically large unit, intended for busbar connection on the main circuit and screw terminals on the auxiliary side. Control voltage is AC 220...240 V, 50/60 Hz. It supports manual, automatic, and remote reset modes, with monostable outputs and ground fault signaling. That ground fault output is useful for ungrounded IT systems or where you need early warning before a phase-to-ground fault escalates.
If you need a drop-in replacement for an existing panel, the closest functional equivalent would be a current SIRIUS 3RB3 series relay in the same current range, but the mounting footprint (S10/S12 busbar) and auxiliary wiring pattern must be verified against your panel layout — they are not guaranteed to be identical.
The 200...820 A current range covers large motors — think 250 kW to 400 kW on 400 VAC, depending on service factor. The Class 5...30 adjustment lets you set the trip class to match the motor's locked-rotor withstand time: Class 5 for submersible pumps with fast starts, Class 10 for standard induction motors, Class 20 or 30 for high-inertia fans or crushers that take longer to accelerate. The busbar main circuit connection means this relay is not a simple add-on to a contactor; it's designed for separate mounting in the panel, with the main conductors running through its integral busbar ports. The AC 220...240 V control supply is standard across European panels. The ground fault signaling output is a separate auxiliary contact, not a built-in ground-fault protection function — it signals when the relay detects an earth leakage path, but the actual tripping still follows the overload curve. For true ground-fault protection you'd need an additional RCD or a combined relay.