Internal pressure Explosion-proof Limit Switch
Water & Dust-proof Limit Switch
Heavy-Duty Use Limit Switch
Other switches
Types of explosive gases applied to explosion-proof devices
When selecting an explosion-proof device, it is important to carefully review the device's explosion-proof structure type, temperature characteristics, and type of gas and steam used. The table below introduces the temperature characteristics according to the type and grade of explosive gas and steam specified by the IEC (International Electrotechnical Commission) and KS (Korea Industrial Standards Association). Please refer to this when selecting a product.
IEC regulations
Class of protective structure | Types of Gases and Steam |
---|---|
I | Methane (firedamp) |
IIA |
|
IIB |
|
IIC | Hydrogen |
temperature characteristics | Rating | T1 | T2 | T3 | T4 | T5 | T6 |
---|---|---|---|---|---|---|---|
maximum surface temperature | 450°C | 300°C | 200°C | 135°C | 100°C | 85°C |
KS (JIS) regulations
Flammability / explosion rating | range of flash point | ||||||
---|---|---|---|---|---|---|---|
Above 450°C | Above 300°C but below 450°C | Above 200°C but below 300°C | Above 135°C but below 200°C | Above 100°C but below 135°C | Above 85°C but below 100°C | ||
G1 | G2 | G3 | G4 | G5 | G6 | ||
I |
|
|
|
|
Ethylnitrite | ||
IIA | Coal gas |
|
Hydrogen sulfide |
|
Ethyl | Limit of nitrate | |
IIB IIC | a | ||||||
b |
| ||||||
c | Acethelene |
Types of explosion-proof structures
Example of symbol application
d | Indicates that the overall protective structure of the equipment is manufactured as a pressure-resistant explosion-proof structure. |
---|---|
2 | Indicates that it can be applied and used for gases and vapors corresponding to triggering grades 1 and 2. |
G4 | Indicates that it can be applied and used for gases and vapors corresponding to ignition degrees G1, G2, G3, and G4. |
Waterproof-dustproof protection structure
IEC regulations (IEC529)
※ IP: Protection characteristic symbol International Protection
Protection level against human body and solid foreign substances
Rating | degree of protection | Rating | degree of protection | ||
---|---|---|---|---|---|
0 | ![]() | No special protection | 4 | ![]() | The ends of solid objects, such as wires or steel strips, exceeding 1 mm in diameter or thickness should not enter the interior. |
One | ![]() | The ends of solid objects such as wires or steel strips exceeding 50 mm in diameter or thickness should not enter the interior. | 5 | ![]() | Dust larger than enough to affect operation does not enter the interior. |
2 | ![]() | The ends of solid objects such as wires or steel strips exceeding 12 mm in diameter or thickness should not enter the interior. | 6 | ![]() | Dust does not enter the interior. |
3 | ![]() | The ends of solid objects such as wires or steel strips exceeding 2.5 mm in diameter or thickness should not enter the interior. |
Degree of protection against water ingress
Grade (KS designation) | degree of protection | Test Methods | |||
---|---|---|---|---|---|
0 (-) | No special protection | ![]() | No special protection against water ingress | no exam | |
1 (spinning type) | Protection against falling water | ![]() | No harmful effects from vertically falling water | Spray water from the test device on the right for 10 minutes. | ![]() |
2 (spinning type) | Protection against falling water | ![]() | No harmful effects from falling water within 15° from the vertical. | Spray water for 10 minutes in a 15° vertical direction from the test device on the right. | ![]() |
3 (rainproof) | protection against rainfall | ![]() | No harmful effects from rainfall within 60° of the vertical. | Spray water from the test device on the right in a vertical direction of 60° for 10 minutes. | ![]() |
4 (splash proof) | protection against droplets | ![]() | No harmful effects from water splashes from all directions | Spray water from the test device on the right in all directions for 15 minutes. | ![]() |
5 (room classification type) | Protection of classified water | ![]() | No harmful effects from direct jetting of water in any direction. | Spray water from the test device on the right in all directions for 15 minutes. | ![]() |
6 (domestic type) | protection against blue | ![]() | No harmful effects from direct jets of water in all directions | Spray water from the test device on the right in all directions for 15 minutes. | ![]() |
7 (Policy type) | Protection against submersion | ![]() | Water does not enter even if submerged in water for a specified period of time. | Place in 1m of water for 30 minutes. | ![]() |
※ In general, the following configuration is mainly used, and any other configuration is considered unreasonable.
IP00/IP11, IP12/IP21, IP22, IP23/IP31, IP33, IP34/IP41, IP42, IP43, IP44/IP54, IP55, IP56/IP65, IP66, IP67, IP68