An explosion-proof motor is a motor that can operate safely in environments with an explosion hazard. To ensure the safety of personnel and equipment, explosion-proof motors must be classified and selected according to protection levels established by international standards. The following are common explosion-proof motor protection levels and their explanations.

1. The protection levels for explosion-proof motors are categorized into different classes, with the most common being the ATEX protection levels, which are based on European standards. The ATEX protection levels are divided into two main categories—II and III—to distinguish between various hazardous explosive environments.

2. ATEX Category II refers to explosion-proof motors used in environments containing flammable gases, vapors, and dusts. Category II is further divided into three subcategories—IIA, IIB, and IIC—classified according to the explosive power of the flammable gases or vapors present in the environment, with increasing severity in that order.

3. ATEX Category III refers to explosion-proof motors designed for use in environments with combustible dust. Category III is further divided into three subcategories—IIIA, IIIB, and IIIC—each classified according to the explosive potential of the combustible dust present in the environment, with increasing severity levels in that order.

4. Based on the protection class of explosion-proof motors, further subdivisions into different protection types are possible. Common protection types include d, e, n, t, and ia, among others.

5. The protection class d indicates that the enclosure of an explosion-proof motor has explosion-proof capabilities, effectively preventing explosive gases or vapors from entering the motor interior and reliably isolating any sparks or high temperatures generated inside the motor.

6. The protection class e refers to the enclosure of an explosion-proof motor, which, building upon the d-class design, features the ability to prevent the diffusion of explosive gases or vapors. It can limit the propagation range of sparks or high temperatures that might be generated inside the motor, thereby reducing the likelihood of an explosion.

7. The protection rating "n" indicates that the enclosure of an explosion-proof motor has protective features capable of preventing large particles or harmful substances from entering the motor interior, thereby safeguarding the motor’s normal operation and extending its service life.

8. The protection class "t" refers to the enclosure of an explosion-proof motor having protective features that prevent the accumulation of impurities such as dust or fibers on the motor's surface, thereby avoiding overheating or malfunctions caused by these impurities.

9. The protection class ia means that the enclosure of the explosion-proof motor has explosion-proof capabilities, enabling it to operate safely in environments containing explosive gases or vapors. Furthermore, through careful circuit design and selection of electrical components, the motor’s interior is ensured to remain free of sparks or high temperatures.

The protection rating of explosion-proof motors is established according to international standards. By selecting an appropriate protection rating, we can ensure that explosion-proof motors operate safely and reliably in hazardous explosive environments. When selecting and using explosion-proof motors, it is essential to choose a suitable protection rating based on the specific hazardous explosive environment and operational requirements, thereby safeguarding the safety of personnel and equipment.