What It Is and Where It Fits
The 3RT1035-1AL28-0PA4: Mounts on a 35 mm DIN rail per EN 50022, with screw and snap-on fastening. Screw-type terminals on the main circuit accept solid conductors up to 4 mm² (2x) and stranded up to 25 mm² (2x), which covers most panel wiring up to this frame size. IP20 on the front, IP00 at the terminals — keep the live parts behind a panel door.
Key Ratings and What They Mean for Your Panel
The headline motor rating is 18.5 kW at 400 V under AC-2 switching duty — that's the current you size your motor branch circuit for when driving slip-ring motors or other loads that see moderate overloads. At 500 V it's rated for 22 kW, and at 690 V it drops to 11.4 kW, so the voltage derate matters if you're on a 690 V distribution system. Mechanical life is typical 10 million operations. Rated switching frequency varies by duty: up to 1 200 cycles/hour at AC-1 (resistive), 1 000 at AC-3 (squirrel-cage motors), and 300 at AC-4 (plugging/inching). That's enough for most conveyor or pump cycling, but if you're jogging a press brake, watch the AC-4 limit. Operating temperature range is -25 to +60 °C, storage from -55 to +80 °C. Coil operates at 50/60 Hz with voltage tolerance of 0.8 to 1.1 times rated.