The Siemens 3RT1036-1AP04-ZW96 is a 3-pole SIRIUS contactor rated for AC-3 duty at 22 kW / 400 V, with a 230 V AC 50 Hz coil. It carries 2 normally open and 2 normally closed auxiliary contacts, all in a size S2 frame with screw terminals. This is the part you spec into a motor branch circuit for a pump, fan, or conveyor — the AC-3 rating means it handles the inrush of a squirrel-cage induction motor during starting and breaks the load under running conditions. The size S2 footprint is a standard Siemens frame that fits the SIRIUS modular system, so it shares busbars, overload relays, and accessory kits across the 3RT1 family.
What the AC-3 rating means for your motor load
The AC-3 utilization category is defined per IEC 60947-4-1 for starting and switching off squirrel-cage motors during running. At 22 kW / 400 V, this contactor is sized for a motor drawing roughly 40–45 A full-load current — a common rating for a 30 hp (22 kW) four-pole induction motor on a 400 V three-phase supply. The 230 V AC coil matches standard control voltages in European and many Asian panels; if your control circuit runs 24 V DC or 110 V AC, you need a different coil variant in the same frame.