The Siemens 3RT1016-1CG65-ZX95 is a Size S00 contactor rated for AC-3 duty at 4 kW on a 400 V three-phase line. The 100 V AC 50/60 Hz coil pulls in the 3NO+2NC main and auxiliary contacts. The varistor is already plugged on across the coil terminals — that snubs the back-EMF spike on dropout, so you can skip adding a separate RC suppressor for most PLC or relay-driver outputs. Screw terminals on a S00 frame mean the wiring fits standard 1.5–2.5 mm² stranded; the 102-unit pack is a line-build or panel-shop quantity, not a single-repair piece.
The AC-3 rating at 4 kW / 400 V is the motor-switching figure that governs real use: it covers standard squirrel-cage induction motors up to that power, including starting inrush and switching off at full load. The 100 V AC coil is common in older European control circuits or step-down transformer-fed panels — verify your control voltage matches before wiring. The 3NO+2NC contact arrangement gives one normally-closed auxiliary for a feedback or interlock loop without adding a side-mount block.