The structure and principle of explosion-proof thermistor and assembled thermistor are basically the same. The difference is that the junction box (shell) of explosion-proof products adopts a special explosion-proof structure in the design. The junction box is made of high-strength aluminum alloy die-casting and has sufficient internal space, wall thickness and mechanical strength. The thermal stability of the rubber sealing ring meets the national explosion-proof standards. Therefore, when the explosive mixed gas inside the junction box explodes, its internal pressure will not damage the junction box, and the resulting heat energy cannot diffuse or transmit to the outside. Due to the use of the above-mentioned explosion-proof special structure, the product fully complies with the requirements for use inWithin the explosion-proof temperature range of dIIBT4 or dIICT6, as long as users strictly follow the product usage rules, the product can achieve reliable explosion-proof effect.