Reversing contactor assembly — SIRIUS S2, 37 kW at 400 V
The Siemens 3RA2338-8XB30-1AC2 is a SIRIUS reversing contactor assembly in Size S2 — two mechanically interlocked contactors that swap motor phase rotation for forward/reverse control without external interlocks.
Mounting and integration — DIN rail with rotation flexibility
Dimensions 141 mm height x 120 mm width x 130 mm depth — fits a standard 120 mm-wide DIN-rail slot with 10 mm clearance needed upwards, forwards, downwards, and at the sides, and zero clearance backwards. The supplied contactors are two 3RT2038-1AC20 units — each rated for the same AC-3 duty, so replacement spares are a single line item.
Wiring and compliance — screw terminals, RoHS dated
Substance prohibition compliance is dated 10/01/2014 — the assembly meets RoHS and REACH requirements as of that effective date. Mechanical life is 10,000,000 operations typical for the contactor size — a solid baseline for high-cycle reversing applications like conveyor shuttles or hoist controls.