A multi-position rotary switch whose handle is rotatable to a selected position to actuate a circuit for an electrically controlled device utilizing a magnetic sensor to initiate the actuating signal without any direct contact of traditional mechanical parts that suffer wear during repetitive operations. Pretreatment of the silicon nitride layer includes nitridation. When the optical packet is a transit packet destined for another node then, if the packet is determined to have a relatively higher priority, it is output from the node via a continuous-flow transmission path. The igniting operation of the actuator involves rotation of the actuator about the fulcrum member in one direction and an auxiliary operation of the actuator to be done in continuous with rotation of the actuator in a direction different from said one direction with the actuator mechanism automatically returned to its initial state in response to return of the actuator to its initial position. A second bushing is provided, which is arranged adjacent to and at a distance from the first bushing on the shaft, and is arranged with an interference fit on the shaft.