1. Explosion-proof Principle:

- The flameproof type is able to withstand the explosion pressure generated when the internal explosive mixture explodes through a solid shell and prevent the internal explosion from spreading to the explosive mixture around the shell.

- The increased safety type is to take measures to improve the safety level on the equipment structure that does not generate electric arcs, sparks, or high temperatures that may ignite the explosive mixture under normal operating conditions to avoid these dangerous phenomena under normal and approved overload conditions.

2. Structural design:

- The shell of the flameproof type has sufficient strength, and the flameproof joint surface between each component has strict parameter requirements, such as clearance, length, and surface roughness, etc.

- The increased safety type mainly improves safety by increasing the electrical clearance, creepage distance, strengthening insulation, and selecting high-quality materials. The requirements for shell strength and other aspects are relatively lower than those of the flameproof type.

3. Applicable places:

- The flameproof type is applicable to dangerous places in Zone 1 and Zone 2.

- The increased safety type is generally applicable to dangerous places in Zone 2.

4. Cost:

- Due to factors such as the shell strength and structural complexity of the flameproof explosion-proof control box, its manufacturing cost is usually higher.

- The increased safety type is relatively simple in structural design and manufacturing process, and the cost is relatively low.