Siemens SIRIUS 3RT1046-1AK60-0UA0 — Size S3 Power Contactor, 55 kW at 500 V
The Siemens SIRIUS 3RT1046-1AK60-0UA0 is a Size S3 power contactor rated for motor switching at 55 kW at 500 V in AC-3 duty, making it the right fit for medium-horsepower induction motors on 400–500 V three-phase lines — think pumps, fans, and compressors in a 50/60 Hz panel. The contactor snaps onto 35 mm or 75 mm standard mounting rail and supports side-by-side mounting, keeping the enclosure fill factor tight. Front protection is IP20 with the cover in place; the terminal area itself is IP00 — standard for panel-mount contactors where the enclosure provides the outer seal. Operating range spans -25 to +60 °C, storage -55 to +80 °C, with pollution degree 3 for industrial atmospheres.
Mechanical Endurance and Switching Frequency
Rated for 10 million mechanical cycles typical, with switching frequencies of 900 ops/h in AC-1 resistive loads, 850 ops/h in AC-3 motor duty, and 250 ops/h in AC-4 plugging/reversing — the AC-4 figure is the one to watch for jogging or inching applications.
Auxiliary Contact Ratings and Coil Data
Auxiliary contacts are rated for 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0.3 A at 220 V DC — the DC rating drops fast with voltage, so verify your DC control circuit load before wiring. Coil operates at 50/60 Hz with a voltage tolerance of 0.8 to 1.1 times rated value.