The Siemens SIRIUS 3RT1035-1AD04-1AA0 is a power contactor in the S2 frame size, rated for motor switching at 22 kW on a 500 V AC-3 duty cycle. The same contactor also carries an 18.5 kW rating at 400 V AC-2 (for slip-ring motors or mixed loads) and a 35 A rating at 400 V AC-4 (for reversing or inching duty where the contactor opens under full load).
The S2 footprint is 55 mm wide by 112 mm high by 164 mm deep — a compact envelope for a contactor rated to 22 kW.
Terminals and wiring
Solid wire accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded wire handles 2x (0.75 to 25 mm²). Solid or stranded combined accepts 2x (0.75 to 16 mm²). At 40 °C the minimum permissible conductor cross-section is 16 mm². These ranges cover most panel wiring up to the contactor's full rated current.
Switching performance and endurance
Rated frequency is 50 Hz, with an operating range of 0.8 to 1.1 times nominal. Maximum mechanical switching rates: 1,200 operations per hour at AC-1, 600 at AC-2, 1,000 at AC-3, and 300 at AC-4. Typical mechanical endurance is 10 million operations. Auxiliary contact ratings: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V.