Circuit-breakers NZM1, 2, 3, 4 up to 2000 A - Moeller Electric Parts

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Engineering
MCB, back-up protection
Circuit-breakers, switch-disconnectors
NZM1, NZM2, NZM3
Protection of PVC insulated cables against thermal overload with short-circuits
According to VDE 0100 part 430 cables and
conductors must be protected against short-circuit
and overload. The overload protection is obtained by
using NZM circuit-breakers with settable, currentdependent,
delayed overload release.
Short-circuit protection is provided by adjustable
instantaneous releases, which open the main contacts
in less than 25 ms. The short-circuit total opening
time restricts the temperature rise of the cable to a
minimum.
Min. protected cross-section mm 2 copper
NZM...1(-4)-...20 6
NZM...1(-4)-...25 … 160 10
NZM...2(-4)-...20 … 250 10
NZM...3(-4)-...250 … 630 16
NZM...4(-4)-...630 … 1600 95
Moeller HPL0211-2007/2008
http://catalog.moeller.net
The tables indicate the minimum conductor crosssection
reliably protected by circuit-breakers during a
short-circuit. (Operating voltage U N = 415 V)
Back-up protection
between NZM(N)(H) incoming circuit-breaker and NZMB(N)(H) outgoing circuit-breaker
Incoming circuit-breaker a
NZM1 NZM2 NZM3
I n up to 160 A up to 250 A up to 630 A
a
I cu(415 V) 25 kA 36 kA 50 kA 100 kA 25 kA 36 kA 50 kA 150 kA 50 kA 150 kA
Outgoing circuit-breaker b
I cu(415 V) I n
NZMB1 25 kA up to 160 A 25 36 50 100 25 36 50 100 50 100
NZMC1 36 kA up to 160 A – 36 50 100 36 50 100 50 100
b NZMN1 50 kA up to 160 A – – 50 100 – – 50 100 50 100
NZMH1 100 kA up to 160 A – – – 100 – – – 100 – 100
NZMB2 25 kA up to 250 A 25 36 50 100 25 36 50 150 50 150
NZMC2 36 kA up to 250 A – 36 50 100 – 36 50 150 50 150
NZMN2 50 kA up to 250 A – – 50 100 – – 50 150 50 150
NZMH2 150 kA up to 250 A – – – – – – – 150 – 150
NZMN3 50 kA up to 630 A – – – – – – – – 50 150
NZMH3 150 kA up to 630 A – – – – – – – – – 150
Where the prospective fault current at the point of
installation of circuit-breakers is very high, it is
conventional to use NZMN(H) current-limiting circuitbreakers.
An attractively priced alternative is to fit a
NZMN(H) current-limiting circuit-breaker upstream of
NZMB(C)(N) standard circuit-breakers, if the fault level
is too high for NZMB(C)(N) switches.
The table shows which current-limiting circuit-breaker
NZMN(H) in combination with NZMB(C)(N) are to be
used to provide protection at the network locations
with high short-circuit capacities.
The selectivity limit is determined by the response
current of the non-delayed short-circuit release in the
upstream incoming circuit-breaker. In many
applications this is sufficient.
between NZM...1-A... incoming circuit-breaker and FAZ-B(C)/PLSM-B(C)... outgoing circuit-breaker
Outgoing circuitbreaker
NZM(B)(C)2-A... NZMC(N)(H)1-A...
Outgoing circuit-breaker
I cc
FAZ-B(C)...
0,5 – 16 25 kA 30 kA
NZM...
20 – 40 20 kA 20 kA
50, 63 15 kA 15 kA
PLSM-B(C)...(/...)
PLSM
0,5 – 16 25 kA 30 kA
20 – 40 20 kA 20 kA
50, 63 15 kA 15 kA
between NZM...2-A... incoming circuit-breaker and FAZ-B(C)/PLSM-B(C)... outgoing circuit-breaker
Outgoing circuitbreaker
NZMB(C)2-A...
NZMN(H)2-A...
Incoming circuit-breaker
I cc
FAZ-B(C)...
0,5 – 10 25 kA 50 kA
NZM...
13 – 32 25 kA 30 kA
40 – 63 20 kA 20 kA
PLSM-B(C)...(/...)
PLSM
0,5 – 10 25 kA 50 kA
13 – 32 25 kA 30 kA
40 – 63 20 kA 20 kA
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