What are the protection classes of explosion-proof motors?


Release time:

30 Aug,2023

An explosion-proof motor is a motor that can operate safely in an explosive hazardous environment. In order to ensure the safety of personnel and equipment, explosion-proof motors need to be classified and selected according to the protection level established by international standards. The following are common explosion-proof motor protection levels and their explanations.

What are the protection classes of explosion-proof motors?

An explosion-proof motor is a motor that can operate safely in an explosive hazardous environment. In order to ensure the safety of personnel and equipment, explosion-proof motors need to be classified and selected according to the protection level established by international standards. The following are common explosion-proof motor protection levels and their explanations.

1. The protection level of explosion-proof motors is divided into different categories, the most common is the ATEX protection level formulated according to European standards. ATEX protection levels are divided into two main categories: II and III, which are used to distinguish different explosion hazard environments.

2. ATEX Class II refers to explosion-proof motors used in flammable gas, steam and dust environments. Class II is divided into three sub-categories, IIA, IIB and IIC, which are classified according to the explosive capacity of explosive gases or vapors in the environment, in increasing order.

3. ATEX Class III refers to explosion-proof motors used in flammable dust environments. Class III is divided into three subclasses, IIIA, IIIB and IIIC, which are classified according to the explosive capacity of explosive dust in the environment, in increasing order.

According to the protection level of the explosion-proof motor, it can be further subdivided into different protection types. Common types of protection are d, e, n, t, and ia.

The protection level d means that the shell of the explosion-proof motor has an explosion-proof effect, which can prevent explosive gas or steam from entering the motor, and effectively isolate the spark or high temperature inside the motor.

6. Protection class e means that the shell of the explosion-proof motor has the function of preventing the diffusion of explosive gas or vapor on the basis of d. It can limit the transmission range of sparks or high temperatures that may be generated inside the motor, thereby reducing the possibility of explosion.

Protection level n means that the enclosure of the explosion-proof motor has a protective function, which can prevent large particulate matter or harmful substances from entering the motor, thereby protecting the normal operation and life of the motor.

The protection level t means that the shell of the explosion-proof motor has a protective function, which can prevent the accumulation of dust or fiber and other impurities on the surface of the motor, and prevent these impurities from causing the motor to overheat or malfunction.

Protection class ia means that the enclosure of the explosion-proof motor has an explosion-proof effect, can operate safely in an explosive gas or steam environment, and can also ensure that no sparks or high temperatures are generated inside the motor through the choice of circuit design and electrical components.

The protection level of the explosion-proof motor is formulated according to international standards. By selecting the appropriate protection level, the explosion-proof motor can operate safely and reliably in an explosive hazardous environment. When selecting and using explosion-proof motors, it is necessary to reasonably select the appropriate protection level according to the specific explosion hazard environment and work requirements to ensure the safety of personnel and equipment.