SIRIUS S0 power contactor – 3RT1026-3AK60
The Siemens 3RT1026-3AK60 is a SIRIUS power contactor in the S0 frame size, rated for 11 kW at 400 V in AC-2 duty (slip-ring motor switching) and 15.5 A at 400 V in AC-4 duty (plugging/inching). The main contacts accept solid or stranded conductors up to 2x 10 mm² (or AWG 8), and the auxiliary terminals handle 2x (0.25 … 2.5 mm²) solid or 2x (24 … 14) AWG. That covers most panel-building and maintenance wiring without needing adapters.
The 45 mm width (S0 frame) fits standard 45 mm module spacing, and side-by-side mounting is allowed with no derating gap.
For Type 2 coordination (no-weld after short circuit), Siemens specifies a 35 A gL/gG fuse upstream. For Type 1 coordination (device may be damaged but no fire risk), use a 100 A gL/gG fuse. The coil draws 0.8 … 1.1 A at 50/60 Hz, so a standard 24 V control transformer with a 2 A secondary handles multiple contactors in a group.
