During routine start‑up of a bulk‑material handling system, the selector lever is installed on the main drive panel to lock the motor controller into the required operating mode. By moving the lever into the “run”, “idle” or “maintenance” position, the operator creates a firm, repeatable contact that keeps the electrical contacts engaged until the lever is deliberately returned to a neutral spot. This tactile feedback prevents accidental mode changes while the conveyor is loading, and it allows quick, reliable switching when the line is reconfigured for a different product flow. In a typical chemical plant, the same lever is used on feed‑pump units to select between normal, bypass or emergency shut‑down settings, ensuring that the valve actuation stays fixed during prolonged operation. Because the lever maintains a stable position without drift, it reduces the need for additional locking devices and speeds up the change‑over process. Its straightforward design also simplifies inspection during preventive maintenance, as the worn‑point is easily visible and can be replaced without disassembling the entire control cabinet.