Its 24 V 50/60 Hz coil matches standard PLC or relay outputs, and the screw-type terminals on the main circuit accept solid conductors up to 4 mm² or stranded up to 50 mm² — enough for the motor power wiring this size handles. This contactor size S3 sits between the smaller S2 and larger S6 frames in the SIRIUS family. The 70 mm width and 146 mm height mean it occupies a standard 35 mm or 75 mm DIN rail slot with room for side-by-side mounting without derating.
The 45 kW rating at 500 V (AC-3 duty) tells you this contactor handles a 3-phase induction motor of that power directly — no external soft-start needed for across-the-line starting. The 21.1 kW at 690 V covers higher-voltage drives or pumps where line voltage steps up. Switching frequency matters for cycling loads: rated at 1 000 operations per hour for AC-3 (motor starting) and 900/h for AC-1 (resistive). For rapid jogging or reversing, the AC-4 limit of 300/h is the one to watch. Auxiliary contact ratings cover the control side: 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. These are the contacts that signal a PLC input or drive a pilot light — the 24 V rating is the one most integrators will use for feedback to the controller.
Main circuit terminals are screw-type, accepting solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). For stranded, it takes 2x (10 to 50 mm²) — that's the range for the motor feeder cables. The front cover carries IP20, meaning finger-safe when closed; the terminal area itself is IP00, so keep live parts behind a panel door.
This order code is the one to specify. No cross-reference to a different frame is needed; the S3 size and 24 V coil are common in European-spec panels.