SIRIUS 3RT1046-1AV00 — Size S3 Power Contactor for Motor Loads
The Siemens SIRIUS 3RT1046-1AV00 is a size S3 power contactor rated for switching motor loads. Its headline AC-3 rating at 500 V is 55 kW, which means it can handle a 55 kW three-phase induction motor under standard starting conditions (make and break under load). For heavier duty cycling like reversing or inching (AC-4), it is rated 80 A at 400 V. The AC-2 rating at 400 V is 45 kW, covering slip-ring motor applications. These ratings are the ones that govern real motor selection — the AC-3 figure is the one to size against for most conveyor, pump, and fan loads. The contactor mounts via screw and snap-on onto 35 mm or 75 mm standard mounting rail, fitting into a standard panel enclosure. Side-by-side mounting is permitted without derating, which simplifies panel layout for multi-contactor groups. Screw-type terminals on the main circuit accept stranded conductors up to 2x 50 mm², sized for the full rated current. Operating temperature range is -25 to +60 °C, with pollution degree 3 (conductive pollution, typical for industrial control panels). The front of the contactor carries IP20 protection, meaning finger-safe when installed in a closed panel; the terminal area is IP00, so live parts are exposed and the panel door must interlock or be tool-accessible.
Auxiliary Contact Ratings and Coil Data
The integrated auxiliary contacts are rated for switching control circuits: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC. These are the values to use when sizing the control transformer or verifying the PLC output can drive the contactor coil. The coil itself is rated for 400 V at 50 Hz, with an operating range of 0.8 to 1.1 times the rated voltage. Mechanical life is 10 million operations. Maximum switching frequency varies by duty: 900 cycles/hour for resistive loads (AC-1), 850 for AC-3 motor starting, 350 for AC-2, and 250 for AC-4. The AC-4 limit is the one to watch for applications with frequent reversing or plugging — exceeding it shortens contact life.