SIRIUS S2 power contactor for motor and resistive loads
The Siemens SIRIUS 3RT1036-1XX10-0UA8 is a size S2 power contactor rated for AC-2 duty at 22 kW on a 400 V line — that means it handles slip-ring motor starting and reversing, where the contactor makes and breaks under load each cycle. Screw-type terminals on the main circuit accept stranded conductors up to 25 mm², and the auxiliary contacts carry 10 A at 24 V. Mounts via screw and snap-on to a 35 mm DIN rail per EN 50022, with side-by-side mounting permitted for dense panel layouts.
What the ratings mean for your panel
AC-2 at 400 V (22 kW) is the motor-switching rating that governs real-world use for wound-rotor motors; AC-4 at 400 V (41 A) covers plugging and inching duty where the contactor opens at locked-rotor current. The 500 V rating of 30 kW and 690 V rating of 11.4 kW give headroom for higher-voltage installations. Switching frequency tops out at 1000 cycles per hour for AC-1 resistive loads, dropping to 300 cycles per hour for the punishing AC-4 regime — plan your cycle rate against the duty. The front face carries IP20 protection; the terminal area is IP00, so the contactor needs enclosure clearance around the wiring zone.
Panel integration details
Dimensions are 55 mm wide, 112 mm high, 115 mm deep — fits a standard S2 contactor slot on the DIN rail. Screw terminals accept solid conductors 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²); stranded main conductors go up to 2x (0.75 to 25 mm²). Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. Pollution degree 3 means it's rated for industrial environments with conductive pollution — no special coating needed for most panel conditions.