Key ratings and what they mean for your BOM
The 3RT1034-3EL28-0KS6: Rated at 18.5 kW at 500 V and 10 kW at 690 V, this contactor handles motor loads typical of medium-voltage distribution in European 400 V / 690 V industrial networks. The 500 V rating covers common 400 V motor applications with headroom; the 690 V rating suits higher-voltage drives or pump/motor circuits in mining, marine, or heavy industry. Operating temperature spans -25 to +60 °C, with storage from -55 to +80 °C. The IP20 front protection means the contactor is safe from finger contact in an enclosed panel, but the terminal area is IP00 — so it requires enclosure protection against dust and tools. Main circuit connections use screw-type terminals accepting 2x (0.75... 25 mm²) stranded or 2x (0.25... 2.5 mm²) solid wire. The S2 frame size keeps the footprint compact at 55 mm wide × 129 mm tall × 164 mm deep, fitting standard 55 mm DIN-rail spacing.
Switching performance and coil data
Mechanical life is rated at 10,000,000 operations typical. Maximum switching frequency varies by duty: 1,200 cycles/hour at AC-1 (resistive), 1,000 at AC-3 (motor start/run), 750 at AC-2 (slip-ring motors), and 250 at AC-4 (plugging/inching). The arcing time is 10–15 ms, and dropout delay on DC control is 20–30 ms. Coil operating range spans 0.8–1.1 × rated voltage at 50 Hz and 0.85–1.1 at 60 Hz. Rated control supply voltage is 230 V at both 50 Hz and 60 Hz. Auxiliary contact ratings: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 2 A at 60 V.