The principle of explosion-proof type is based on the concept of explosion-proof and fire-proof type of European standard EN13463-1:2002 "Non-electrical equipment for explosive atmospheres - Part 1: Basic methods and requirements". The explosion-proof type is to take measures to allow internal explosion and prevent flame propagation It is an explosion-proof type that is commonly used.

Since the shell of this type of explosion-proof lamp is generally made of metal material, it has good heat dissipation, high shell strength and good durability, and is very popular with users. Moreover, many components of increased safety explosion-proof lamps, such as lamp sockets, interlock switches, etc., also use explosion-proof structures. Electrical equipment with flameproof enclosures is called flameproof electrical equipment.

If an explosive gas mixture enters the flameproof enclosure and is ignited, the flameproof enclosure can withstand the explosion pressure of the explosive gas mixture inside and prevent the internal explosion from propagating to the explosive mixture around the enclosure.

This is a gap explosion-proof principle, that is, the use of metal gaps can prevent the spread of the explosion flame and cool the temperature of the explosion product, achieve flame extinguishing and cooling, and suppress the expansion of the explosion. A structure designed on the principle of principle.

Many production sites produce certain flammable substances. For example, about two-thirds of the underground coal mines have explosive substances; in the chemical industry, more than 80% of the production workshop areas have explosive substances. In the production process, a large number of electrical instruments are used, and various frictional sparks, mechanical wear sparks, electrostatic sparks, and high temperatures are inevitable, especially when the instruments and electrical failures occur. At the same time, oxygen in the air is ubiquitous.