文件编号：
NDT2920257
文件版本：
3
地址：上海市浦东新区申江南路
2000
号
邮编：
201315
电话：
(021)68586699
传真：
(021)23025796
第
10
页
共
17
页
(5) Do not install the breaker in places with gaseous medium corrosive to metal and aggressive to
insulation.
(6) De-rating for temperature and altitude.
断路器安装场所的环境要求如下表
9
：
Environmental requirements for installation location of breaker are shown as follow Table 9:
表
9
断路器安装场所的环境要求
Table 9 Environmental requirements for installation location of breaker
项目
Item
规范
Specifications
周围空气温度
Ambient air
temperature
-35
℃
～
+70
℃
相对湿度
Relative
humidity
(
在
+40
℃时
)
不超过
50%
，最低温度湿月最不超过
+25
℃，且该月平均最大相对
湿度不超过
90%,
并考虑因温度变化发生在产品表面上的凝露。
The relative humidity of the air does not exceed 50% (at +40
℃
), the lowest
temperature in the most humid month should not exceed +25
℃
, and the highest
humidity in this month should not exceed 90% while condensation on breaker
surface caused by temperature change should be taken into consideration.
海拔高度
Altitude
不超过
2000m
Lower than 2000m
污染等级
Pollution degree
3
级
Level 3
温度降容系数见下表
10
：
Temperature de-rating coefficient is shown as follow Table 10:
表
10
温度降容系数
Table 10 Temperature de-rating coefficient
温度
Temperature
+40
℃
+45
℃
+50
℃
+55
℃
+60
℃
+65
℃
+70
℃
NDM3EU-225
1
1
1
0.976
0.952
0.927
0.902
NDM3EU-400
1
1
1
0.978
0.957
0.934
0.911
注：当使用环境温度低于
50
℃时，产品可正常使用，不存在降容。
Notes
：
When ambient temperature is less than 40
℃
, breaker can be used normally without any de-rating.
4.3
当环境温度为
+40
℃，海拔高度大于
2000
米时，考虑到空气的绝缘特性和冷却能力，脱扣特性将
有变化，对
NDM3EU-225/400
应予修正（见表
11
）
When the working environment is +40
℃
,altitude is over 2000m,which is considered by the insulation and
cooling of air, the tripping curve will change which must be modified. See table below for both
NDM3EU-225/400.
