SIRIUS S2 Power Contactor, 110 VAC Coil
The Siemens SIRIUS 3RT1034-1AG20 is a size S2 power contactor with a 110 V 50/60 Hz coil, rated for motor switching at 18.5 kW at 500 V in AC-3 duty and 10 kW at 690 V. It mounts via screw and snap-on onto a 35 mm DIN rail per EN 50022, with screw-type terminals on the main circuit.
What the Ratings Mean for Fit
The 18.5 kW at 500 V AC-3 rating is the motor-switching figure that governs real-world sizing for standard squirrel-cage induction motors. The 10 kW at 690 V extends the contactor into higher-voltage, lower-current applications. AC-2 at 400 V is rated at 15 kW, covering slip-ring motor duties. The 110 V 50/60 Hz coil has an operating range of 0.8 to 1.1 at 50 Hz and 0.85 to 1.1 at 60 Hz, so the coil holds in reliably even with a sagging control supply.
Switching Rates and Mechanical Life
Maximum switching rates are 1200 cycles/hour for AC-1 resistive loads, 1000 for AC-3 motor starts, and 250 for AC-4 plugging/inching. Mechanical life is rated at 10,000,000 operations typical, so the contactor is built for high-cycle applications like conveyor lines or compressor banks.
Panel Integration and Wiring
The contactor occupies 55 mm width on the DIN rail, with a depth of 115 mm and height of 112 mm. Side-by-side mounting is permitted without derating, so multiple units pack tight in a panel. Main circuit terminals accept stranded wire up to 2x 25 mm² or solid up to 2x 4 mm². The front face is IP20, the terminal area is IP00 — typical for panel-mount gear where the enclosure provides the environmental seal. Pollution degree 3 means it handles conductive pollution in industrial atmospheres.