In robotic welding cells on automotive body-in-white lines, these precision limit switches serve as the final safety and position feedback element for the welding gun’s closing stroke. Mounted directly on the gun’s actuator or on the fixture that holds the sheet metal panels, the switch detects the exact moment the electrodes make contact with the workpiece. This signal triggers the welding controller to initiate the current pulse, ensuring consistent weld quality while preventing over-travel that could damage the electrodes or misalign the panels. The same switch often doubles as a safety interlock, cutting power if the gun fails to open after the weld cycle, protecting operators and downstream equipment from accidental collisions. Adjacent to this, in automated press lines, the switch monitors the die’s closed position before the press ram descends, confirming that the blank is properly seated and that no foreign objects remain in the tooling. Here, its compact size allows installation in tight spaces between die segments, where larger sensors would interfere with the tool’s stroke.