PTC current limiting device having flashover prevention structure

摘要

Disclosed is a PTC (Positive Temperature Coefficient) current limiting device, which limits a current using PTC characteristics. The device includes a PTC element (110) having the PTC characteristics; and upper (121) and lower contact electrodes (131) arranged to face each other with the PTC element (110) being interposed therebetween, wherein, assuming that a distance from an end of the upper contact electrode to an end of the PTC element (110) is a1, a distance from an end of the lower contact electrode to the end of the PTC element (110) is a2, a thickness of the PTC element (110) is b, and L=a1+a2+b, the following equations are satisfied: V/L 10 and V/b 50, where V is a rated voltage of the PTC current limiting device, a unit for a1, a2 and b is mm, and a unit for V is volt. This PTC current limiting device may prevent generation of flashover between electrodes.