When a CNC milling machine completes a machining pass and the control system cues the operator to engage the next tool change, the operator presses the dedicated push‑button on the console, and the snap‑action switch instantly toggles the spindle stop relay. This rapid, tactile response guarantees that the spindle is halted before the tool changer clamps a new cutter, preventing damage to both the workpiece and the tooling. The same type of switch is also embedded in the machine’s emergency stop panel, where a firm press disconnects power to the drive motors, providing a clear mechanical break that can be verified by the audible click of the contacts. In addition to tool‑change sequencing, the switch is often used to initiate coolant flow or to start a probing routine, allowing the CNC controller to sense a precise user command without ambiguity. Outside the machining centre, plant operators rely on the same switch design in process‑control panels to acknowledge alarms or to start auxiliary conveyors, where its reliable, repeatable actuation reduces the chance of accidental starts. The result is a consistently safe and predictable transition between machine states whenever the operator needs immediate control.