文件编号：
NDT2920129
文件版本：
2
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
12
页
共
20
页
安装板开孔 Holing installation panel
板前接线(X-X、Y-Y 为三极断路器中心) Front-panel wire(X-X, Y-Y is the centre of three-pole
breaker)
表 9 外形尺寸与安装尺寸
Table 9 External dimensions and installation dimensions
型号
Type
NDM2L-125
NDM2L-250
NDM2L-400
NDM2L-630
安装板开孔尺寸
（
mm
）
Holing size of installation panel
A
60
70
94
140
B
129
126
194
243
C
4.5
4.5
7
7
注：未注公差尺寸的极限偏差按
GB/T 1804-m
。
Note: The limit deviation not indicated with the tolerance dimensions is as per GB/T 1804-m.
7.
安装方式/ Mounting Method
7.1 绝缘测试
Insulation test
本断路器出厂前已按标准规定绝缘测试。因断路器带有电子线路板，安装前如进行复测，必须按如下
步骤：
The breaker has gone through specified standard insulation test before factory delivery. Because many PCBs
are installed in the breaker, for re-testing, please conduct tests according to following procedures:
（
1
）用
500VDC
兆欧表。
Use a 500VDC megameter.
（
2
）在断路器处于断开状态，对进出连接板
1-2
、
3-4
、
5-6
之间，和
1
、
3
、
5
连接板（
3
个连
接板用导线相连）与外壳之间（外壳用金属箔覆盖）分别进行。
Place the breaker in open status, carry out test
between 1-2, 3-4 and 5-6 connection boards, as well as between the 1, 3 and 5 connection boards (connected with
wires) and the breaker shell (covered by metal foil).
（
3
）对接至主电路的欠电压脱扣器，在进线与断路器外壳间。
Test should be done in position between
incoming wire and breaker shell to test undervoltage release in the main circuit.
（
4
）绝缘电阻不小于
20 M
Ω。
Insulation resistance should not be lower than 20M
Ω
.
注
:
也可分离电子线路板后进行绝缘测试。
Notes: Insulation test can also be done after separation of PCBs.
