The Siemens 3RT2027-2AN24 is a SIRIUS S0 power contactor with a 24 VDC coil and spring-type terminals, designed for screw and snap-on mounting onto 35 mm DIN rail per DIN EN 60715.
The contactor's maximum switching frequency varies by load type: 1,000 cycles per hour for AC-1 resistive loads, 750/h for AC-2 and AC-3 motor starting, and 250/h for AC-4 plugging or inching duty. For a buyer sizing this into a motor circuit, the AC-3e rating of 750 cycles/h is the practical limit for normal starting — exceeding it risks overheating the coil and contacts. Auxiliary contact ratings are voltage-dependent: 6 A at 24 V, 2 A at 48 V or 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, and 0.6 A at 440 V — useful for interlocking or status feedback to a PLC.
Spring-type terminals accept solid or stranded wire from 1 to 10 mm², and two conductors per terminal from 0.5 to 2.5 mm² — common for control wiring loops.
The 3RT2027-2AN24 is listed as current-production — no end-of-life notice or last-time-buy date is on record, so it remains a standard BOM line item for new panels and spares.