SIRIUS Size S00 Power Contactor, 110 VDC Coil
The Siemens 3RT1017-1KF41 is a SIRIUS power contactor in the compact Size S00 frame, designed for switching motor loads and resistive circuits in control panels. It carries a 110 VDC coil with an integrated varistor for surge suppression, and its screw-type terminals accept wire sizes from 2x (0.5... 1.5 mm²) solid up to 2x (0.75... 4 mm²) stranded, with a maximum of 2x (0.75... 4 mm²). This contactor is rated for motor switching in AC-2 duty at 5.5 kW at 400 V, and in AC-4 duty at 8.5 A at 400 V. For higher-voltage motor circuits, it delivers 5.5 kW at both 500 V and 690 V. The coil draws 2.3 W for both closing and holding, so the control transformer sizing is straightforward — no inrush spike to over-spec for. The 45 mm width and 57.5 mm height fit the Size S00 footprint, with a depth of 72 mm. It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022, and side-by-side mounting is permitted with no derating gap required. The IP20 rating on the front and terminals means it is protected against finger contact but must be housed inside an enclosure.
Switching Capacity and Coordination
The 3RT1017-1KF41's switching capacity varies significantly with the DC coil voltage and load type. At 24 V rated value it switches 10 A, at 60 V rated value 2 A, at 110 V rated value 1 A, and at 220 V rated value 0.3 A — these are the DC-13 (solenoid) ratings for the auxiliary contacts. For the main contacts in AC-1 (resistive) duty, it handles 20 A with gL/gG fuses of 20 A for Type 2 coordination, or 35 A fuses for Type 1 coordination. The AC-3 motor rating is not explicitly listed in this evidence, but the AC-2 and AC-4 ratings provide the motor-switching envelope. The AC-2 rating of 5.5 kW at 400 V covers slip-ring motor starting, while the AC-4 rating of 8.5 A at 400 V covers plugging and inching duty. For standard squirrel-cage motors (AC-3), the 5.5 kW at 500/690 V gives a practical guide for 400 V circuits — expect around 4 kW at 400 V in AC-3, but verify against the motor full-load current.
Lifecycle and Sourcing
Compliance documentation includes RoHS compliance with a substance prohibition date of 07/01/2006, and the part is rated for pollution degree 3 (conductive pollution typical in industrial environments). The operating temperature range is -25 to +60 °C during operation. The mechanical life is rated at 30,000,000 operating cycles typical.
Integration Notes
Side-by-side mounting is allowed — no spacing required between contactors. The Size S00 frame (45 mm wide) fits standard 45 mm DIN-rail slots. Screw-type terminals for both main and auxiliary circuits accept solid or stranded wire: 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²), with a maximum of 2x (0.75... 4 mm²). For AWG, the auxiliary contacts accept 2x (20... 16), 2x (18... 14), or 1x 12 AWG. The integrated varistor on the 110 VDC coil suppresses the inductive kick when de-energizing — no external suppression diode needed. The coil power is a constant 2.3 W DC, so the control transformer only needs to supply that steady load. For fuse coordination, use gL/gG fuses: 20 A for Type 2 coordination (no damage to the contactor) or 35 A for Type 1 coordination (contactor may need replacement after a fault).