SIRIUS Power Contactor for Motor Loads
The Siemens 3RT1035-1AL00 is a SIRIUS-brand power contactor in the Size S2 frame, designed for switching three-phase motors and resistive loads in industrial control panels. Its primary motor ratings are 22 kW at 400 V and 11.4 kW at 690 V under AC-3 duty, which covers the majority of standard squirrel-cage motor starting and stopping applications. The contactor mounts via screw fixing or snap-on onto a 35 mm DIN rail per DIN EN 50022, with a 55 mm width that fits standard panel layout grids. Side-by-side mounting is supported, allowing dense packing in multi-contactor assemblies. Main power circuit connections use screw-type terminals, accepting stranded conductors up to 2x 25 mm² and solid conductors up to 2x 4 mm². The front face carries an IP20 rating for basic finger protection, while the terminal area is rated IP00, meaning the wiring zone must be housed within an enclosure for touch safety.
Rating Depth and Application Fit
The AC-3 rating of 22 kW at 400 V defines the contactor's capability for switching three-phase induction motors under normal running conditions — starting, stopping, and occasional inching. For more demanding duty cycles, the AC-4 rating at 400 V is 35 A, which governs plugging and reversing applications where the contactor must break stalled rotor currents. For resistive or lightly inductive loads (AC-1), the contactor's thermal current capacity is not directly stated, but the AC-2 rating of 18.5 kW at 400 V indicates suitability for slip-ring motor starting. The maximum operating rate at AC-3 is 1,000 switching cycles per hour, which aligns with typical conveyor and pump cycling. Auxiliary contact ratings are provided for DC switching: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V. These values are critical for control circuit designers sizing pilot devices or PLC outputs feeding the contactor coil.
Environmental and Compliance Profile
RoHS compliance is documented with a substance prohibition date of May 1, 2012, covering the EU RoHS directive. No UL or CSA listing is explicitly stated in the available data, but the SIRIUS platform typically carries these approvals; verification against the specific project's certification requirements is recommended before specifying.
Panel Integration Notes
Dimensions are 112 mm height, 55 mm width, and 115 mm depth, fitting standard 55 mm-wide contactor slots in panel layouts. The screw and snap-on mounting onto 35 mm DIN rail per DIN EN 50022 allows tool-less installation or removal for maintenance. Wire termination accepts solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²). Stranded conductors: 2x (0.75 to 25 mm²). This range covers standard motor feeder cables up to 6 mm² for the 22 kW rating, with flexibility for paralleled control wiring.