A protective device for a vehicle electronic apparatus, which includes an inverter for converting a direct-current voltage into an alternating-current voltage for the vehicle electronic apparatus, detects a temperature of the inverter. Specifically, the present ultra-fine fibrous carbon is characterized by the graphite-like structure with the sp2 hybrid carbon content of more than 95% per total content; the plane interlayer spacing profiles determined by X-ray diffraction method) of 0. As additional traces andor nets are added to the virtual printed circuit board, the spacers are dynamic and adjust accordingly to maintain the specified clearances. The film substrate includes slots each of which is formed to extend along a plane of the film substrate with a first end side thereof connected to a corresponding through hole. The floating gate forms legs extending into the three-dimensional coupling region of the trench thereby providing a three-dimensional coupling with the source which also assumes a three-dimensional region. The traction assist device also includes an attachment arrangement for releasably coupling the frusto-conical structure to a wheel assembly of the vehicle, such that at least part of the frusto-conical structure is adapted to engage with terrain during operation of the vehicle in loose terrain and to not engage with terrain during operation of the vehicle on normal terrain.