The Siemens SIRIUS 3RA2434-8XF32-1AL2 is a pre-assembled star-delta (wye-delta) contactor assembly rated for 22 kW at 400 V AC-3, meaning it handles the motor starting current for a 22 kW induction motor on a 400 V three-phase supply. It ships as a complete unit with three contactors: two 3RT2035-1AL20 and one 3RT2026-1AL20, plus the RS assembly kit 3RA2933-2C — no separate ordering of individual contactors and interconnecting wiring. The Size S2 contactor frame keeps the assembly compact for a 22 kW starter — 177.5 mm wide, 142 mm high, 223 mm deep — fitting within a standard 600 mm enclosure depth with room for gland plates and cable management.
This flexibility simplifies panel layout when the starter must fit around existing busbars or ducting. The main power circuit accepts solid conductors up to 2x (1 … 35 mm²) and 1x (1 … 50 mm²), covering the cable sizes for a 22 kW motor feed. The control circuit uses screw-type terminals accepting 2x (0.5 … 1.5 mm²) or 2x (0.75 … 2.5 mm²) solid or stranded wire. All terminals are screw-type, so a standard slotted or Pozidriv driver is all the panel builder needs. Clearance distances: 10 mm upwards, forwards, downwards, and to the side; 0 mm backwards (mounting surface). These clearances are the minimum to maintain rated creepage and clearance — a panel builder can abut the back directly against the mounting plate.
Vibration resistance is specified at 18.5g / 5 ms and 11.6g / 10 ms under AC conditions — relevant for installations on machinery with shock loads, such as punch presses or large compressors.