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III
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 4000 A 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 industry where very high 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 its
type; intended for the protection of cable-type feeders or to raise the performance level of a switchboard when the
transformer power rating is increased.
Masterpact NW 800 to 4000 A
Masterpact NT 630 to 1600 A
Masterpact NW 4000 to 6300 A
NW08
H1
65 kA
N1
42 kA
NW10 NW12 NW16 NW20 NW25 NW32 NW40
NW40b
H1
100 kA
NW50
NW63
NT06
H1
42 kA
NT08
NT10
NT12
NT16
sizes:
207E1100.indd
version: 7.4