Siemens 3RT1036-1AG60 SIRIUS Power Contactor
At AC-3 duty (squirrel-cage motors), the rating shifts — the 500 V line shows 30 kW, and at 690 V it delivers 11.4 kW, so the buyer needs to match the utilization category to the load type, not just the highest kW number. Terminals are screw-type on the main current circuit. Solid wire accepts 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), and up to 2x (0.75...4 mm²). That range covers control wiring through motor power tails without needing adapter lugs.
Duty Ratings and Switching Life
The AC-2 rating at 400 V (22 kW) is the headline figure for this contactor, but the AC-3 and AC-4 ratings tell the real switching story. At AC-3 (squirrel-cage motor starting), the maximum switching rate is 800 operations per hour; at AC-4 (plugging or inching), it drops to 300 per hour. Coil operating range is 0.8...1.1 at 50 Hz and 0.85...1.1 at 60 Hz. Arcing time runs 10...15 ms, with a total make/break time of 7...20 ms at AC. That's fast enough for most motor-starting sequences but not for semiconductor-grade switching — this is an electromechanical contactor, not a solid-state relay.
