| *作用环境代码Environment code for special use | 代表意义Meanings |
| W1 | *污型：适用于轻污秽地区Dirness resistance t*e：applies to the area with slight dirtiness |
| W2 | *污型：适用于重污秽地区Dirness resistance t*e：applies to the area with serious dirtiness |
| GY | 高原型：适用于高海拔地区Plateau t*e：applies to high altitude area |
| TA | 干热型：适用于干热地区 Xerothermic t*e：applies to the xerothermic area |
| TH | 湿热型：适用于湿热地区 Hot damp t*e：applies to the hot damp area |
| ZH | 组合型：可与隔离开关构成组合电器Combinedt*e：It can beused with descommector to mak up of combined electrical apparatus |