Scope Of Application; Working Environment - nader NDW3 Series Manual

Scope of application

The NDW3 air circuit breaker (hereinafter referred to as circuit breaker) can be applied to the
distribution network with AC of 50 Hz / 60 Hz, rated current of 200A～7500A, rated insulation voltage of
1140V, rated operational voltage of AC220/230/240V, AC380/400/415V, AC440/480V, AC660/690V, AC800V,
AC1000 and AC1140V AC1140V、AC1380V、AC1500Vfor distribution of electrical energy and protecting
circuit and power equipment from overload, under-voltage, short circuit, single phase grounding and harm
of other faults. It also has an isolating function at the same time. The circuit breaker has multiple protection
functions. It can avoid unnecessary sudden power failure while realizing highly accurate selective
protection, and improve the reliability and security of the power supply system.

5.1 Working Environment

5.1.1 Ambient temperature
Applicable ambient temperature is -25℃ ~ + 70℃; the average within 24 h shall not be more than
+35℃.
The circuit breaker with the ambient temperature below -40℃~-25℃ can be specially customized.
If the ambient temperature is higher than +40°C, the user needs to reduce the capacity. The reduced
capacity coefficient is shown in the following table.
Ambient
temperature
200A
400A
630A
NDW3-1600 800A
1000A
1250A
1600A
630A
800A
1000A
NDW3-2500
1250A
1600A
2000A
2500A
800A
1000A
NDW3-4000
1250A
1600A
Internal & confidential file
File No.:NDT2920202
+40℃
45°C
200A 200A
400A 400A
630A 630A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
630A 630A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
2000A 2000A
2500A 2375A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
第 86 页 共 149 页
-50°C 55°C
200A 200A
400A 400A
630A 630A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
630A 630A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
2000A 2000A
2225A 2125A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
File Version:4
5
60°C 70°C
200A 200A
400A 400A
630A 630A
800A 800A
1000A 1000A
1250A 1250A
1600A 1520A
630A 630A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A
1950A 1825A
1950A 1825A
800A 800A
1000A 1000A
1250A 1250A
1600A 1600A