SIRIUS S3 power contactor — 21–33 VDC coil, spring terminals
It carries a 21–33 V rated coil voltage with a 0.8× pickup threshold, drawing 2.4 VA at both 50 and 60 Hz, and an inrush peak of 2.2 A. Spring-type terminals accept solid 2.5–16 mm² or stranded 6–70 mm² on the main circuit, with 2×(0.5–2.5 mm²) for the coil.
The 52 a MTBF means this contactor is rated for over 455,000 hours continuous operation — a solid reliability figure for a machine that runs 24/7. The 5,000,000 mechanical cycles tell you the spring-loaded mechanism will outlast most production lines before wear becomes a factor. Switching frequencies are duty-dependent: 1,000 cycles/hour in AC-3 and AC-3e motor switching, 900 in AC-1 resistive, 400 in AC-2 slip-ring motor, and 300 in AC-4 plugging/reversing (–,). The arcing time of 10–20 ms is typical for DC coils — plan your control timing accordingly. Clearance distances: 10 mm upward/downward, 20 mm forward, 10 mm at the sides. Dimensions are 70 mm wide × 140 mm high × 152 mm deep. The coil holds at 21 V minimum (0.8× of 33 V max) and drops out reliably below that threshold. At 24 V rated value the contactor switches 10 A; at 48 V and 60 V it switches 2 A (–) — keep these auxiliary contact ratings in mind when driving pilot devices or PLC inputs.