The Siemens 3RB1246-1EB30 is a solid-state overload relay rated 25-100 A for full motor protection, sized for S2/S3 frames. It includes ground-fault detection, monostable outputs, and an overload warning — all fed from a DC 24 V auxiliary supply. The main circuit uses a current transformer; the aux circuit terminates at screw terminals. Reset is selectable: manual, automatic, or remote.
The 25-100 A range covers S2/S3 motor starters. The solid-state trip provides adjustable class 5-30. Ground-fault detection is built in. The DC 24 V control supply is common across modern PLC-based lines.