Siemens 3RT2028-1AN60 SIRIUS Power Contactor, Size S0, 45 mm

The contactor is rated for AC-3 switching at up to 750 operations per hour, and AC-4 at 250 operations per hour. AC-3 covers starting and running squirrel-cage motors; AC-4 covers inching and plugging duty. If your application involves frequent jogging, the 250 cycles/h ceiling on AC-4 is the limiting figure — not the AC-3 number. Coil consumption is 0.25 A at 50 Hz and 0.28 A at 60 Hz — a small enough draw that a standard 24 VDC power supply can drive multiple contactors without oversizing, but check the inrush if you are ganging several on one output. Wire range accepts solid or stranded conductors from 1 to 10 mm², and also allows two conductors per terminal (2x 0.5…1.5 mm² or 2x 0.75…2.5 mm²). That dual-conductor capability is useful for daisy-chaining control wiring without extra terminal blocks. The auxiliary switch is built in (yes/no: yes), with contact ratings that vary by voltage: 10 A at 24 V, 2 A at 48/60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 0.6 A at 440 V. These are the make/break capacities for the auxiliary contacts — useful for PLC inputs or indicator lamps, but not for power switching. The storage range is wider because the contactor is not dissipating coil heat; the operating range is the one that governs panel ambient.