The 3RB1262-0LG01: The 200-820 A current range covers large motor loads — think 150-600 kW induction motors at 400 V, depending on service factor. The Class 5-30 adjustment means the relay can be set to trip on overload at a multiple of the full-load current over a defined time window: Class 5 for submersible pumps or compressors that start unloaded, Class 10 for standard motor starts, Class 20 or 30 for high-inertia loads like centrifuges or crushers. The S10/S12 frame size tells you the physical footprint matches Siemens contactors in that range — busbar connection on the main circuit, so it's a direct bolt-on for panel builds that already use that contactor family.
Deployment Context
This relay mounts to the contactor or individually on a panel backplate — no DIN-rail clip, so plan for screw-fixing or busbar support. The auxiliary circuit uses screw terminals, which is standard for control wiring in industrial panels. Ground-fault signaling and bistable outputs make it suitable for applications where a fault memory is needed — the relay holds its trip state even after control power cycles, which helps maintenance identify intermittent overloads.