The Siemens SIRIUS 3RT1026-3AL28-1MA2 is a size S0 power contactor with a 230 V 50/60 Hz coil, designed for switching motor loads in control panels. Rated for 11 kW at 400 V in AC-2 duty (slip-ring motors) and 15.5 A in AC-4 duty (reversing/inching), this contactor handles the demanding switching cycles of conveyor drives, pumps, and compressors. The three main poles use screw-type terminals accepting up to 2x 10 mm² or 1x 8 AWG, with a solid wire range of 0.25 to 2.5 mm² on the auxiliary contacts. A built-in 3-pole auxiliary contact block provides instantaneous signalling for feedback or interlocking.
Coil and auxiliary contact ratings
The 230 V coil operates at 50 Hz and 60 Hz with an operating factor range of 0.8 to 1.1 at 50 Hz and 0.85 to 1.1 at 60 Hz, meaning it picks up reliably even with a sagging line. The auxiliary contacts are rated for 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V — sufficient for PLC input cards or small relay loads.
Environmental and coordination specs
The front face carries IP20 finger protection; the terminals are IP00 — panel builders must ensure terminal shrouding or enclosure clearance.
Compliance documentation typically includes CE, UL, CSA, and IEC 60947-4-1 certification for the SIRIUS series. RoHS and REACH declarations are standard from Siemens for this product family.