Siemens SIRIUS 3RT1026-1AG20-ZW96 — S0 Power Contactor for Motor Loads
The Siemens SIRIUS 3RT1026-1AG20-ZW96 is a size S0 power contactor rated for 11 kW at 400 V in AC-2 duty, meaning it handles standard squirrel-cage motor starting and stopping within that power band.
The AC-2 rating at 400 V (11 kW) is the headline motor-switching spec — it confirms the contactor can handle a 11 kW induction motor on 400 V three-phase without excessive contact wear. The AC-4 current (15.5 A) is the limiting figure for high-stress duty cycles: if your application requires frequent reversals or inching, size the motor load so the starting current stays under 15.5 A. The operating current at AC-12 (10 A) applies to resistive or lightly inductive loads like heaters or transformers, not motor duty.
Mounting and Wiring in the Panel
The 3RT1026-1AG20-ZW96 is 45 mm wide, 85 mm tall, and 91 mm deep — a compact S0 footprint that leaves room for auxiliary contact blocks or overload relays on the same DIN rail. Screw terminals on the main circuit accept 2x (0.75 to 4 mm²) solid or stranded, and up to 2x 10 mm² for the main conductors — enough for the 11 kW motor feed.