What this reversing contactor assembly is
The Siemens 3RA2328-8XB30-2AC2 is a SIRIUS reversing contactor assembly in the S0 frame size. It ships as a pre-assembled pair of contactors with mechanical and electrical interlocking, ready to reverse a three-phase motor without external wiring between the two contactors. The 24 V AC/DC coil means it runs off a standard control transformer or PLC output without a separate rectifier.
Mounting and wiring — what fits in the panel
Snaps onto 35 mm DIN rail or screws to a backplate. The S0 footprint is 90 mm wide, 114 mm tall, 97 mm deep — fits a standard 200 mm deep enclosure with room for gland plates. The coil terminals are also spring-type. No screw torque to check — strip, push, done. That saves time on a panel with a dozen of these.