SIRIUS 3RT1045-1BV40 Power Contactor — Size S3, 45 kW at 500 V
Its AC-3 rating of 45 kW at 500 V means it handles standard squirrel-cage motor starting and stopping up to that power level — the rating that governs real motor duty, not the higher AC-1 resistive figure. Main circuit connections are screw-type terminals, accepting solid conductors up to 2x 4 mm² or stranded up to 2x 50 mm² — sized for the full rated current without needing lug adapters.
Switching Performance and Mechanical Life
Rated for 1,000 operations per hour at AC-3 duty, 900 at AC-1, 400 at AC-2, and 300 at AC-4 — the AC-4 figure is the limiting case for plugging or inching applications. Mechanical life is typical 10,000,000 operations, so the contactor outlasts most panel designs in normal cycling. The DC switching ratings are 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — resistive loads only; inductive DC loads require derating or arc-suppression external to the contactor.