Abstract: In order to better solve the problems such as the rapid development of electric cabinet fire and the difficulty of fire extinguishing, this paper constructed an electric cabinet block type self-extinguishing device based on thermal insulation material, which integrates accurate detection and reliable fire extinguishing, is easy to install and can be used repeatedly. Through the analysis of the hot spot area of the electric cabinet fire, the arrangement scheme of heat- sensitive insulating material was determined, and relevant fire extinguishing tests were carried out. The results show that the self-extinguishing device can extinguish electric cabinet fire quickly under various working conditions. In the cable fire test, the device realized fire extinguishing within 20~35 s. In the large-scale fire test, the fire suppression is realized within 29~37 s. In the multi- position fire test, fire suppression can be realized within 18~75 s. The repeated fire - extinguishing test shows that the device has good repeatability.

Key words: fire protection, heat- sensitive insulating material, electrical cabinet; self-extinguishing device