The AC-4 rating of 55 A at 400 V covers plugging and inching duty, so this contactor handles the high electrical wear of frequent reversals without derating prematurely. The 37 kW at 500 V rating suits North American 480 V systems, while the 18.6 kW at 690 V covers European 690 V distribution.
Termination and panel integration
Main circuit connections use screw-type terminals. Solid conductors from 0.5 to 4 mm² (2x) and stranded conductors from 10 to 50 mm² (2x) are accepted, covering control wiring through motor power cables. The contactor is 70 mm wide, 146 mm tall, and 188 mm deep — a Size S3 footprint that fits alongside other SIRIUS components on the DIN rail. Side-by-side mounting is permitted, so multiple contactors can be ganged without spacing gaps.