Siemens 3RT1026-1AG20-ZI41W96 Contactor — Integrator's Spec Recap
The Siemens 3RT1026-1AG20-ZI41W96 is a SIRIUS 3RT1 contactor rated AC-3 at 11 kW on 400 V three-phase — that's the motor-switching duty for a 15 HP class induction motor at 400 V. The -ZI41W96 suffix denotes a special version with reusable packing in a 96-unit pack — the contactor itself is standard electrically.
What the AC-3 11 kW Rating Means for Motor Switching
The AC-3 duty class covers starting and switching off squirrel-cage motors under load. At 400 V, the 11 kW rating corresponds to roughly 22 A making and breaking current — the contactor is designed to handle the inrush (typically 6–8× FLA) during start and interrupt the running current without welding or excessive arc erosion.
Panel Integration: Size S0 DIN Rail Mount
The 3-pole block occupies roughly 45 mm of rail width — plan for that footprint plus the required clearance for screwdriver access on the line/load terminals. Screw terminals accept up to 4 mm² stranded or 6 mm² solid; torque to 1.2–1.5 Nm. The 110 V AC coil draws about 5 VA holding, so a 50 VA control transformer can feed several contactors in a group.