SIRIUS S3 power contactor — 110 VDC coil, screw terminals
Rated switching frequency varies sharply by duty: 900 operations per hour at AC-1 (resistive), 850 at AC-3 (squirrel-cage motor start/run), 350 at AC-2 (slip-ring motor), and 250 at AC-4 (plugging/inching). For a conveyor or pump running continuous AC-3 duty, that 850 cycles/hour headroom is generous — the thermal limit on the contactor, not the coil, is what governs here. Motor power ratings reach 55 kW at 500 V and 25.4 kW at 690 V, so it handles European 400 V motors comfortably and steps up to 690 V industrial networks without derating the frame.
Dimensions are 176 mm high, 70 mm wide, 152 mm deep — the S3 frame is a standard footprint across the SIRIUS contactor family. Side-by-side mounting is permitted with zero spacing, which saves rail length in dense panels. The clamping range covers everything from signal-level wiring to full motor cable cross-sections without adapter lugs. These are the minimum air gaps to maintain rated insulation — useful when laying out a row of contactors on a DIN rail to avoid arc tracking.