PROTECTIVE DEVICE

摘要

Provided is a protective device which has large rated voltage and rated current and is able to sufficiently suppress the occurrence of arc during operation and fully open a circuit. A protective device is characterized by comprising: (i) a protective element which comprises a first temperature fuse and a resistor, and in which the resistor generates heat by the passage of an electric current through the resistor when abnormality occurs, and the first temperature fuse operates by this heat and interrupts an electric current; (ii) a PTC element; and (iii) a second temperature fuse, and in that the second temperature fuse is electrically connected in series with the PTC element, the first temperature fuse of the protective element is electrically connected in parallel with the PTC element and the second temperature fuse, and when the abnormality occurs, the PTC element trips and generates heat by operating the protective element, and the second temperature fuse is blown by this heat.