The Siemens 3RA2317-8XB30-1AH0 is a SIRIUS reversing contactor assembly — a pre-assembled pair of contactors with a mechanical interlock, built from two 3RT2017-1AH02 contactors, designed to reverse a three-phase motor by swapping two phases. Rated motor power is 5.5 kW at 400 V AC (AC-3 duty), with an operational current of 11 A at 480 V and 600 V, so it handles standard 400 V class induction motors up to 5.5 kW and 480/600 V motors up to 11 A.
Mounts via screw fixing or snaps onto a 35 mm standard DIN rail — the Size S00 frame (90 mm wide, 68 mm tall, 73 mm deep) fits compactly in a control panel, leaving room for auxiliary contact blocks or a separate overload relay downstream. Main circuit and coil connections use screw-type terminals; the main circuit accepts 2x (0.5...1.5 mm²), 2x (0.75...2.5 mm²), or 2x 4 mm² solid or stranded conductors — sized for the 11 A rating.
The AC-4 rating of 4 kW at 400 V covers plugging and inching duty — frequent reversals or jogging where the motor is switched while still spinning — so this assembly suits conveyors, hoists, or any application needing repeated direction changes under load. Mechanical endurance is 10,000,000 operating cycles typical for the contactor, which translates to years of service in a high-cycle reversing application. The assembly includes an integrated mechanical interlock (implied by the reversing contactor assembly designation and the two supplied contactors), preventing both contactors from closing simultaneously and shorting the supply.