What This SIRIUS Size S2 Contactor Does
It's rated for 22 kW at 500 V AC-3 and 18.5 kW at 400 V AC-2, which covers the typical 3-phase induction motor range for pumps, fans, and conveyors on 400 V or 480 V lines.
Wiring and Termination Reality
Main circuit terminals are screw-type, accepting solid conductors from 2x (0.5 to 1.5 mm²) up to 2x (0.75 to 4 mm²), and stranded from 2x (0.75 to 25 mm²). That's a wide range — fine for both control wiring (1.5 mm²) and power tails (16 mm² or 25 mm²). The solid-or-stranded entry also lists 2x (0.75 to 16 mm²), which is the practical limit for most panel builders. Strip length and torque values aren't in this record, but the screw terminals are standard for the class. Auxiliary contacts are rated for switching at multiple voltages: 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V. That covers PLC-level signals (24 VDC) and control circuits up to 400 VAC. The 10 A at 24 V is useful for direct drive of indicator lamps or small relays without an interposing stage.
That's typical for indoor panel environments — no special heating or cooling required unless the enclosure sits in a hot plant area. Switching frequency varies by duty: 1200 cycles/hour at AC-1 (resistive), 1000 at AC-3 (motor), and 300 at AC-4 (plugging/inching). For a conveyor running at 30 starts/hour, that's years of service before mechanical wear becomes a factor.