Reversing contactor assembly — what the ratings mean on the rail
The 3RA2328-8XB30-1AL2-ZW96: It's built into a size S0 frame with screw terminals, so it wires up clean on standard DIN rail in a control panel. The AC 230 V coil means the pick-up and hold-in voltage matches a common control transformer secondary in North American and European panels. The 50/60 Hz rating covers both line frequencies without derating.
Switching duty and mechanical interlock
This is a reversing assembly — the electrical and mechanical interlock prevents both contactors from closing simultaneously, which would short the phases through the motor windings. The 2 NO integrated auxiliary contacts give you feedback for the PLC or status indication without adding a separate block. AC-3 duty at 18.5 kW means it handles starting currents up to about 6× full-load current for squirrel-cage motors — typical for conveyors, pumps, and compressors where reversing is needed. The size S0 frame keeps the DIN-rail footprint manageable; you're not cramming extra width into a tight enclosure.