SIRIUS S2 power contactor, 22 kW AC-3 motor switching
The Siemens 3RT1035-1AG60 is a SIRIUS S2-frame power contactor rated for 22 kW at 500 V in AC-3 duty, meaning it handles the inrush and breaking of three-phase squirrel-cage motors up to that load. The coil pulls in on 100-110 V at 50 Hz or 60 Hz, with a pickup range of 0.8-1.1x rated voltage at 50 Hz and 0.85-1.1x at 60 Hz — standard for this class.
Terminal and wiring — screw-type main circuit
Main circuit terminals are screw-type, accepting solid conductors from 2x 0.5-1.5 mm² up to 2x 0.75-4 mm², and stranded from 2x 0.75-25 mm². The auxiliary circuit takes 2x 0.75-16 mm² solid or stranded. Strip length for the main terminals is not specified here, but the 8 mm rule common to Siemens screw terminals applies — verify against the terminal marking.
Duty cycle and mechanical life
Rated for 10 million mechanical operations typical. Maximum switching rates vary by duty: 1200 cycles/hour in AC-1 (resistive), 1000 in AC-3 (motor running), 600 in AC-2 (slip-ring motor starting), and 300 in AC-4 (plugging/inching). The arcing time is 10-15 ms, and the make/break time across AC contacts is 7-20 ms.