Siemens 3RT2016-2AD02 SIRIUS Power Contactor, Size S00, 24 V

Spring-type terminals on the coil accept solid or stranded conductors from 0.5 to 4 mm², and up to 2x (0.5 to 4 mm²) per clamp. That covers standard control wiring sizes used in motor starter circuits — no special lugs or ferrules needed, though ferruled stranded wire seats best in the spring cage. The contactor carries switching frequency ratings per duty class: up to 1,000 cycles per hour for AC-1 (resistive loads), 750 cycles/h for AC-2 and AC-3 (slip-ring and squirrel-cage motors), and 250 cycles/h for AC-4 (plugging/reversing). At AC-3e the same 750 cycles/h applies. These numbers govern thermal rise in the enclosure — if your application cycles a motor every 5 seconds, you need to check the AC-3 limit (750/h = one cycle every 4.8 seconds minimum). Auxiliary contacts are present (the contactor includes an auxiliary switch), rated for switching at various voltages: 10 A at 24 V, 3 A at 400 V, and 1 hp at 230 V. That means it can directly switch a small pilot lamp or PLC input at 24 V, or a contactor coil at 400 V, without needing an interposing relay. These are the minimum air gaps to other live parts or grounded metal — critical when laying out the DIN rail to avoid arc flash or tracking between phases. That helps when the contactor sits on a hinged panel door or a slanted sub-panel.