56 / 338
A-4
Presentation of
Masterpact NW/NT
circuit breaker
Circuit breakers
Functional system
Functional units
For more informations, you can consult Masterpact NT/NW
catalogue, ref. LVPED208008_EN.
Presentation
PB106363A32.eps
PB104860.eps
PB106367A24.eps
An answer to specific applications
In addition to the traditional features of power circuit
breakers (withdrawability, discrimination and low
maintenance), Masterpact NT and NW ranges offer built-in
communications and metering functions, all in optimised
frame sizes.
Masterpact NT andNW incorporate the latest technology to
enhance both performance and safety. Easy to install, with
user-friendly, intuitive operation and environment-friendly
design, Masterpact NT and NW are, quite simply, circuit
breakers of their time
Two families and three frame sizes
The range of power circuit breakers includes two families:
>
>
Masterpact NT, the world’s smallest true power circuit
breaker, with ratings from 630 to 1600 A
>
>
Masterpact NW, in two frame sizes, one from 800 to
4000A and the other from 4000 A to 6300 A.
5 performance levels
>
>
N1: for standard applications with low short-circuit
levels.
>
>
H1: for industrial sites with high short-circuit levels or
installations with two parallel-connected transformers.
>
>
H2: high-performance for heavy industrywhereveryhigh
short-circuits can occur.
>
>
H3: for incoming devices supplying critical applications
requiring both high performance and a high level of
discrimination.
>
>
L1: for high current-limiting capability and a
discrimination level (37 kA) as yet unequalled by any
other circuit breaker of itstype; intended for the
protection of cable-type feeders or to raise the
performance level of a switchboard when the
transformer power rating is increased.
Installation
Standardisation of the switchboard
With optimised sizes, the Masterpact NT and NW ranges simplify the
design of switchboards and standardise the installation of devices:
>
>
horizontal or vertical rear connections can be modified on-site by
turning the connectors 90° or they can even be replaced by front
connection terminals
>
>
identical connection terminals for the fixed or draw-out version
from 800 to 6300 A (Masterpact NW) front connection requires
little space because the connectors not increase the depth of the
device.
Practical installation solutions
TheMasterpact NWrange further improves the installation solutions
that havebuilt the success of its predecessors: 115mmpolepitch for
NW, 70 mm pole pitch for NT
>
>
incoming connection to top or bottom terminals:
horizontal or vertical, rear or front connection