Part identity and key ratings
The Siemens 3RT1034-1AF00 is a SIRIUS power contactor in the S2 frame size, designed for switching motor loads in control panels. Its headline AC-3 rating is 18.5 kW at 500 V, meaning it handles the inductive load of a standard three-phase induction motor up to that power without derating. The contactor is rated for 1,000 operating cycles per hour under AC-3 duty, which suits it for frequent start-stop applications on conveyors or pumps.
Mounting and integration
Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 50022. The 55 mm width and 112 mm height fit a standard panel layout; side-by-side mounting is permitted without derating, so you can pack multiple units on a rail for multi-motor groups. Screw-type terminals on the main circuit accept stranded wire up to 25 mm² and solid up to 16 mm², which covers the feed for the rated motor current.