SIRIUS S00 power contactor, 24 V DC coil — what the ratings mean for fit
The Siemens 3RT1017-1VB41 is a SIRIUS S00-frame power contactor with a 24 V DC magnet coil and an integrated diode surge suppressor. The S00 frame size — 45 mm wide, 57.5 mm tall, 72 mm deep — snaps onto 35 mm DIN rail per EN 50022 and fits the standard panel-building grid. The 24 V DC coil draws 1.4 W both on pick-up and hold, so the control transformer and power supply see a steady, low load; the built-in diode means you do not need an external free-wheel diode across the coil, but verify polarity before energizing. The headline motor-switching numbers: 5.5 kW at 400 V AC-3, 5.5 kW at 500 V AC-3, and 5.5 kW at 690 V AC-3. That is the same power rating across the three common industrial voltages, which means the contactor is current-limited at the 400 V level — the AC-3 rated operational current is the binding number for sizing. At 400 V AC-4 (inching/jogging duty) it is rated 8.5 A, so if your application requires frequent plugging or reversing, that is the figure to size against, not the AC-3 kW. For resistive or general-purpose loads (AC-1 / AC-12), the maximum operating current is 10 A. The contactor also carries a 6 A rating at 230 V and 3 A at 400 V for other utilization categories — useful when switching heater banks or lighting contactor duty.
Coordination and terminal wiring
The screw-type main circuit terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid/stranded copper. AWG equivalents: 2x (20 to 16), 2x (18 to 14), 1x 12. The IP20 finger-safe terminal shrouds are standard for panel-mounted gear — no extra cover needed for the front. Pollution degree 3 means it is rated for conductive pollution typical in industrial control panels, not for clean-room or sealed environments. Short-circuit protection coordination: Type 1 coordination requires a 35 A gL/gG fuse; Type 2 coordination requires a 20 A gL/gG fuse. If you are specifying for a UL 508A panel, the Type 2 fuse limits let-through energy so the contactor remains usable after a fault — the 20 A figure is the one to hand to the panel builder.