The 3RB1246-1EG00-0FM0: The 25-100 A AC current range covers standard IEC frame-size motor loads from about 7.5 kW up to 45 kW at 400 V, depending on the motor's full-load current. The integrated thermistor (PTC) input means the relay directly monitors motor winding temperature through a PTC sensor embedded in the stator — no separate thermal module needed. The ground-fault monitoring channel requires an external summation current transformer (not included) to detect leakage currents; this is a separate protection function from the overload and thermistor channels, each with its own set of monostable NO/NC contacts.
Deployment context
Mounts on a DIN rail in the motor control center or panel. The solid-state design eliminates the mechanical wear of bimetal relays, making it suitable for frequent starting duty or harsh environments where vibration could nuisance-trip a thermal relay. The separate ground-fault output allows direct connection to a safety PLC or shutdown circuit without an interposing relay.