The 3RB1246-1EG00: The 25-100 A range covers standard IEC motor sizes from about 7.5 kW up to 45 kW at 400 V, depending on the motor's full-load current. The Class 5-30 adjustability lets you match the trip curve to the motor's thermal time constant — Class 10 for standard motors, Class 20 for high-inertia loads like fans or crushers. The S2/S3 frame size means it mounts directly on Siemens SIRIUS contactors of those sizes, sharing the same DIN-rail footprint. The AC 110-120 V control coil is common in North American panels; verify your control voltage matches before specifying.
Individual mounting on DIN rail. The main circuit uses an ST transformer for current sensing — no separate CTs needed. Auxiliary wiring is via screw terminals; strip length around 8-10 mm for reliable clamping. The manual-automatic-remote reset selector gives flexibility for unattended restart after a trip. Ground-fault signaling output can feed a PLC input or annunciator panel. Monostable outputs mean the relay drops out on loss of control power — fail-safe behavior for safety circuits.