NM8N High-voltage (HV) Series Molded Case Circuit Breaker
Main Purpose and Scope of Application
1
Conditions and Environments for Normal Service, Installation,
and Transportation & Storage
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This is the Instruction Manual for the NM8N High-voltage (HV) Series Molded Case Circuit Breaker,
hereafter referred to as the Circuit Breaker. The Manual specifies the conditions and environments where
the product is expected to be operated within, and it outlines the main specifications, technical
parameters, the overall and installation dimensions, and other matters for this Circuit Breaker.
This Instruction Manual gives the specification and the operation of the Molded Case Circuit Breaker
NM8N High-voltage (HV) Series (Hereinafter referred to as the Circuit Breaker), which is designed solely
for making and breaking electrical circuits of AC 50Hz/60Hz electrical systems, and any other systems
with maximum AC voltage 1140V at maximum rated current of 630A. The Circuit Breaker can reliably
protect the electrical system when the electrical loading of the system is overloaded, short-circuited or
under-voltage; and it also provides short-circuit protection for starting up of electrical motor infrequently.
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Model, Specification and Meaning
High- voltage Code
Case Frame Current Code
250:250A
400:400A
630:630A
Molded Case Circuit Breaker
Number of poles:3-pole
Rated Current Code:
250: 63-80-100-125-160-180-200-225-250
400: 250-315-350-400
630: 400-500-630
Release Code: Thermal magnetic-type (TM)
Electromagnetic-type (M)
Breaking Capacity Code (@AC800V)
C: 36kA
S : 50kA
NM8N
630
HV
S
TM
630
3P
3.1
Ambient Air Temperature
The operating and storage temperature of the Circuit Breaker is -40℃~+70℃, and the average value
in 24h shall not 35℃. When the ambient temperature is -40℃~+ 70℃, the User/s shall consider
capacity reduction or temperature compensation.
When the maximum temperature is +40℃, the relative humidity of the air shall not exceed 50%. At a
lower temperature, a higher relative humidity can be allowed (For example: Up to 90% at +20℃). Special
measures shall be taken for occasional condensation due to temperature change.
The altitude of the installation site for the product shall not exceed 2000m;Note: When the altitude
of the installation site for the product exceeds 2000m, please use it according to the Altitude Derating
Correction Factor.
Summary of Contents for NM8N Series
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