What this reversing contactor is and why it matters
The Siemens 3RA1316-8XB34-1CP0 is a fully assembled reversing contactor in the SIRIUS 3RA1 family, built around two mechanically and electrically interlocked contactors in Size S00. It switches a 3-phase motor up to 4 kW at 400 V in AC-3 duty (9 A rated operational current), so it handles standard induction motor reversing — conveyors, pumps, fans — where you need direction change without a separate mechanical interlock. The 230 V AC coil (50/60 Hz) pulls in reliably across the -25 to +60 °C operating range, and the screw-type main terminals accept the wire sizes typical for this current class.
Lifecycle status and the replacement path
This part is explicitly marked as a phased-out product. The official Siemens successor is the SIRIUS 3RA2 series, with the preferred replacement order code 3RA2316-8XB34-1CP0. If you're filling a BOM line or a panel spare, that 3RA2 variant is the drop-in functional equivalent — same Size S00, same 230 V AC coil, same AC-3 4 kW / 9 A rating, same auxiliary contact configuration.
What you get on the auxiliary side and the varistor
The varistor is already plugged onto the coil terminals, so you don't need to source a separate suppression module for the AC coil.
The assembly measures 90 mm wide, 72 mm deep, and 67 mm tall — Size S00 footprint. The 90 mm width means it occupies about 5 TE (terminal units) on the rail.