The Siemens SIRIUS 3RT1035-1AD00 is a size S2 power contactor rated 22 kW at 500 V in AC-3 duty — that's the motor-switching curve for a standard three-phase squirrel-cage induction motor, so it handles starting inrush and breaks the running current on a 22 kW load at that voltage. At 400 V AC-4 (reversing or inching duty), it carries 35 A, which is the rating that governs frequent plugging or jogging applications where the contacts make and break under locked-rotor current. Screw-type terminals on the main circuit accept stranded wire up to 2x 25 mm² and solid up to 2x 4 mm², with a minimum permissible cross-section of 16 mm² at 40 °C.
RoHS compliance date is 05/01/2012.
Operating environment and mechanical endurance
Maximum switching rates vary by duty: 1 200 cycles/hour at AC-1 (resistive), 1 000 at AC-3 (motor running), and 300 at AC-4 (reversing/plugging).