The Siemens SIRIUS 3RT1034-1AR60 is a size S2 power contactor rated for AC-2 duty at 15 kW on a 400 V, 50 Hz supply — that's the motor-switching curve for slip-ring rotors or wound-rotor motors where the load current stays high through the start. On 60 Hz it handles 400 to 440 V.
Terminal wiring and connection
That's a wide enough range to land a 4 mm² motor feed on the line side and still double up a 1.5 mm² control wire on the same terminal. The auxiliary circuit uses the same screw clamps. Strip length and torque aren't listed here, but the 0.5 mm² minimum means fine-stranded thermocouple or signal wire needs a ferrule to avoid whiskers under the screw.
Switching performance and thermal limits
Electrical life depends on the duty cycle: AC-1 (resistive) allows 1,200 operations per hour, AC-3 (standard squirrel-cage motor start/run) allows 1,000 ops/h, and AC-4 (plugging/inching) drops to 250 ops/h.