What it is and what the key ratings mean
The Siemens 3RT1016-1BF45-ZW96 is a 3-pole contactor from the SIRIUS series, Size S00, with a DC 110 V coil and an auxiliary contactor block mounted on the front carrying 3 normally-open and 2 normally-closed contacts. The AC-3 rating of 4 kW at 400 V means it is sized for switching three-phase induction motors up to that power — the standard duty for conveyor drives, pumps, and compressors in a control panel. The screw terminals accept solid or ferruled stranded conductors typical of panel wiring.
Integration and mounting
Size S00 snap-mounts directly onto a 35 mm DIN rail inside an enclosure. The front-mounted auxiliary contactor block adds no extra DIN width — it stacks vertically, so the panel layout stays compact. Screw terminals are standard for panel builders who prefer a positive mechanical clamp over spring-cage; strip length and torque follow the manufacturer's published values.