SIRIUS S00 power contactor — 3RT1017-1AU61
The Siemens 3RT1017-1AU61 is a SIRIUS power contactor in frame size S00, designed for switching motor loads and resistive circuits in industrial control panels. It carries three normally open main contacts and uses screw-type terminals for the main current circuit, with a 24 VDC coil. Rated operational current hits 8.5 A at AC-4 / 400 V — that is the severe-duty motor-switching category for reversing, inching, or plugging, where the contactor makes and breaks stalled-rotor current. For standard AC-3 motor starting, the contactor is rated at 5.5 kW at 400 V (AC-2 duty), covering typical three-phase induction motors up to that power. The resistive load rating (AC-12) is 10 A maximum, so it handles heater banks or lighting circuits within that limit. DC switching capability is specified at several voltages: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — useful for DC motor brakes or solenoid loads in mixed-voltage panels.
Mounting and integration
Mounts via screw or snap-on onto 35 mm DIN rail per EN 50022. The S00 footprint is compact at 45 mm wide, 57.5 mm high, and 72 mm deep — fits standard 45 mm-wide DIN-rail slots. Side-by-side mounting is permitted without derating, which keeps panel density high. Wire range for main terminals accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or up to 2x (0.75 to 4 mm²) — solid or stranded. AWG equivalents are 2x (20 to 16), 2x (18 to 14), or 1x 12. The enclosure is rated IP20 on the front and at the terminals, so it is intended for installation inside a panel with a higher-rated enclosure.
Environmental and protection coordination
Operating ambient temperature range is -25 to +60 °C, with a maximum operating altitude of 2,000 m. Pollution degree 3 per IEC 60947-1 means it is suitable for industrial environments with conductive pollution or dry non-conductive pollution that becomes conductive due to condensation. For short-circuit protection, Type 2 coordination (no damage to the contactor) requires a gL/gG fuse rated at 20 A. Type 1 coordination (contactor may need replacement after fault) allows a 35 A gL/gG fuse. This lets the panel designer choose between tighter protection or higher fault tolerance.