The Siemens 3RA2338-8XB30-1AG2 is a SIRIUS reversing contactor assembly — a factory-built, mechanically interlocked pair of contactors that reverses a three-phase motor without external wiring interlocks. It is specified for a 37 kW motor at 400 V AC (AC-3 duty) and carries a 65 A rated operational current at 480 V. The coil is 110 V, 50/60 Hz. Two 3RT2038-1AG20 contactors are built into the assembly, so the electrical ratings and terminal capacities match that base contactor.
Mounts on 35 mm standard DIN rail via the snap-on mechanism or with screws. The enclosure footprint is 141 mm high by 120 mm wide by 130 mm deep. Clearance around the assembly: 10 mm upwards, forwards, downwards, and to the side; 0 mm backwards. That 10 mm side clearance is tight — plan your gland plate and wireway spacing accordingly.
Terminal capacities and wiring
Main circuit terminals are screw-type, accepting 2x (1 … 35 mm²) solid or 1x (1 … 50 mm²) solid. The coil and auxiliary terminals accept 2x (0.5 … 1.5 mm²) or 2x (0.75 … 2.5 mm²) solid or stranded. That 50 mm² main terminal is generous for the 65 A rating — you can land a single large conductor without a ferrule adapter.
The lifecycle stage for this order code is listed as current — meaning Siemens has not flagged it for discontinuation or end-of-life as of the latest data.