What it is and where it fits
The Siemens 3RT1017-2BP41 is a SIRIUS-branded power contactor in frame size S00, rated for switching three-phase motor loads up to 5.5 kW at 400 V under AC-3 duty. It mounts via screw or snap-on onto 35 mm standard DIN rail per EN 50022, with a 45 mm width footprint that fits tight panel layouts. Main circuit connections use spring-loaded terminals accepting 2x (0.25 to 2.5 mm²) solid or stranded copper, which speeds wiring and holds under vibration better than screw terminals.
Key ratings and what they mean for your application
Rated for AC-3 motor switching at 5.5 kW on 400 V three-phase, this contactor handles the inductive inrush of standard squirrel-cage motors up to that power — the rating that governs real motor starts, not the resistive AC-1 figure. For reversing or plugging duty (AC-4), it carries 8.5 A at 400 V, so expect reduced service life if used for frequent inching or jogging of a motor near its full AC-3 rating. Motor power ratings extend to 5.5 kW at both 500 V and 690 V, making it suitable for 690 V line supplies common in wind turbine nacelles or mining installations. One instantaneous auxiliary contact is built in, rated 10 A at 24 V DC and 6 A at 230 V AC — enough for a PLC feedback signal or a holding circuit interlock. Coil hold power is a constant 3.3 W DC, so the thermal load on the panel stays low even under continuous energization.
Environmental and installation limits
Operates from -25 °C to +60 °C, with altitude limited to 2000 m — no derating needed for most indoor or sheltered outdoor cabinets, but check the thermal curve if ambient exceeds 60 °C. Front face is IP20, meaning finger-safe when installed in a closed panel; the terminals themselves are also IP20, so no additional shrouding is required for basic touch protection. Pollution degree 3 rating allows use in industrial environments with conductive dust or occasional condensation — typical for unheated switchrooms or nacelle cabinets. Side-by-side mounting is permitted without derating, saving rail space when multiple contactors are ganged for a star-delta or reversing starter.
Protection coordination and sourcing posture
For Type 2 coordination (no weld after fault), use a gL/gG fuse rated 20 A; for Type 1 coordination (allow contactor replacement after fault), a 35 A fuse is specified. The reference code per DIN EN 81346-2 is Q, consistent with power switching devices in European schematic standards.