The Siemens 3RT1647-1AN61 is a SIRIUS capacitor contactor built for switching capacitive loads — specifically rated AC-6 at 50 kVAr / 400 V. That AC-6 duty class means it's designed to handle the inrush current from power-factor correction capacitor banks without welding the contacts. The coil pulls 200 V AC at both 50 and 60 Hz, so it lands on a standard control transformer secondary in European panels.
Lifecycle and replacement
This order code is a phased-out product. The manufacturer's designated successor is the SIRIUS 3RT2 series, with preferred replacement type 3RT2636-1NP35. The official successor is a drop-in functional replacement for new designs, but verify the coil voltage and auxiliary contact configuration against your panel schematic before committing.
The 70 mm width and 183 mm depth fit a standard S3-size contactor footprint — panel cutouts and gland-plate layouts for the SIRIUS 3RT1 family carry over.
Protection is IP00 on the terminals and IP20 on the front with the cover or box terminal installed — so it's panel-internal only, not for washdown or outdoor use without an enclosure. RoHS compliance date is noted as 05/01/2012, indicating the part was RoHS-compliant from that date forward.