On a high‑speed automotive body‑shop line, the vacuum switch monitors the suction of each robotic gripper as it lifts a freshly welded chassis component. When a gripper closes around a sheet‑metal part, the switch senses the drop in pressure and sends a PNP signal to the PLC, confirming that the part is securely held before the arm begins its transfer move. This immediate feedback prevents dropped parts, reduces scrap, and keeps the cycle time within the tight tolerances required for mass‑production of passenger‑car frames. The same principle is applied in paint‑spray stations, where the sensor verifies that the vacuum‑hold‑down for the spray nozzle is engaged, allowing the control system to open the paint valve only after a reliable seal is confirmed. In wheel‑assembly cells, the device is mounted on the suction cup that picks up brake discs; the signal it generates triggers the conveyor to advance only after the disc is firmly attached, synchronising the workflow without manual inspection. By providing a simple, binary indication of vacuum presence, the switch integrates seamlessly into the existing control architecture and keeps the line moving safely and efficiently.