The Siemens 3RT1016-1AU61 is a SIRIUS power contactor in frame size S00, built for switching three-phase motor loads in control panels. It carries three normally-open main contacts and a 24 VDC coil, with screw-type terminals for the main circuit. Snap-on mounting onto a 35 mm DIN rail per DIN EN 50022 makes it a direct fit for standard panel layouts.
What the ratings mean for fit
The AC-2 switching capacity at 400 V is rated at 4 kW, meaning the contactor handles wound-rotor motor loads up to that power level without contact welding. AC-4 at 400 V is 8.5 A, covering reversing or inching duty where the contacts make and break under full load. The 24 VDC coil holds reliably at nominal voltage; dropout below 18 V is typical for this class, so verify your control supply stays above that threshold.
Panel integration notes
The contactor measures 45 mm wide, 57.5 mm tall, and 72 mm deep, fitting the S00 footprint. Side-by-side mounting is permitted without derating, so you can gang multiple units on the same DIN rail for multi-motor groups. The IP20 finger-safe enclosure on the front and terminals means the panel builder can work near live busbars without additional shrouding — standard for control cabinets.
Terminal and wiring
The screw terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, with a maximum of 2x (0.75 to 4 mm²) per clamp. AWG equivalents are 2x (20 to 16) solid and 2x (18 to 14) stranded, plus a single 12 AWG. Strip length is not stated in this record, but the S00 family standard is 8 mm — verify against the terminal marking before wiring.