The Siemens SIRIUS 3RT1326-1AM20 is a size S0 power contactor with four normally-open main contacts, rated for 11 kW at 400 V in AC-2 duty — the standard category for slip-ring motor starting and reversing. It snaps onto a 35 mm DIN rail per EN 50022, so it drops into any standard panel without extra bracketry.
Ratings and fit
The 11 kW AC-2 rating at 400 V is the figure that governs motor switching for wound-rotor or reversing applications — not the same as a general-purpose AC-3 rating, so verify your load type before specifying. For type 1 coordination the fuse requirement is gL/gG 63 A; for type 2 it drops to 35 A, which affects the upstream protection sizing. Operating temperature spans -25 to +60 °C, and the contactor is rated for pollution degree 3 — typical for industrial control panels where conductive dust or condensation is present. The S0 footprint (61 mm wide, 85 mm tall, 91 mm deep) is compact enough for dense rail layouts; side-by-side mounting is allowed with a 6 mm gap between units. Main circuit terminals are screw-type, accepting up to 2x 10 mm² stranded or 1x AWG 12. The solid and stranded wire ranges (0.5–4 mm² for control, 1–10 mm² for power) cover typical panel wiring without needing adapters.