Technical Data - IC SYSTEMS automatika

130 Selectivity, line protection, backup protection
Line protection, backup protection
Circuit-breakers, switch-disconnectors
up to 1600 A
Protection of PVC insulated cables against thermal overload with short-circuits
In accordance to VDE 0100 part 430 the cables and
conductors must be protected against overload and
short-circuit. In circuit-breakers NZM, the overload
protection is implemented via the adjustable, currentdependant
time-delayed overload releases.
Minimum protected
cross-section mm 2 copper
NZM...1(-4)-...20 6
NZM...1(4)-...25 – 160 10
NZM...2(-4)-...20 – 250 4
NZM...3(-4)-...250 – 630 16
NZM...4(-4)-...630 – 1600 95
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.
Moeller SK1230-1157GB-INT
The tables indicate the minimum conductor cross-section
reliably protected by circuit-breakers during a shortcircuit.
(Operating voltage U n = 415 V)
Backup protection
Between NZM(N)(H)(L) 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 630kA
a
I cu 25 kA 50 kA 100 kA 25 kA 50 kA 100 kA 150 kA 50 kA 100 kA 150 kA
Outgoing circuit-breaker b
I cu (415 V) I n
NZMB1 25 kA Up to 160 A 25 50 100 25 50 100 100 50 100 100
b
NZMN1 50 kA Up to 160 A – 50 100 – 50 100 100 50 100 100
NZMH1 100 kA Up to 160 A – – 100 – – 100 100 – 100 100
NZMB2 25 kA Up to 250 A 25 50 100 25 50 100 150 50 100 150
NZMN2 50 kA Up to 250 A – 50 100 – 50 100 150 50 100 150
NZMH2 100 kA Up to 250 A – – 100 – – 100 150 – 100 150
NZMN3 50 kA Up to 630 A – – – – – – – 50 100 150
NZMH3 100 kA Up to 630 A – – – – – – – – 100 150
Where the prospective fault current at the point of
installation of circuit-breakers is very high, it is
conventional to use NZMN(H)(L) current-limiting circuitbreakers.
An attractively priced alternative is to fit a
NZMN(H)(L) current-limiting circuit-breaker at the point in
the network upstream of NZMB(N)(H) standard circuitbreakers,
if the fault level is too high for NZMB(N)(H)
switches.
The table indicates which current-limiting circuitbreakers
NZMN(H)(L) in combination with NZM(B)(N)(H)
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
I cc
Outgoing circuit-breaker Incoming circuit-breaker
NZMB1-A...
NZMN1-A...
NZM...
FAZ.../
NZM
FAZ-(2)(3)(4)(N)-B(C)...
0,5 – 16 25 kA 30 kA
20 – 40 20 kA 20 kA
50, 63 15 kA 15 kA
PLSM-B(C)...(/...)
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
I cc
Outgoing circuit-breaker Incoming circuit-breaker
NZMB2-A...
NZM...
FAZ.../
NZM
FAZ-(2)(3)(4)(N)-B(C)...
0,5 – 10 25 kA 50 kA
13 – 32 25 kA 30 kA
40 – 63 20 kA 20 kA
PLSM-B(C)...(/...)
0,5 – 10 25 kA 50 kA
13 – 32 25 kA 30 kA
40 – 63 20 kA 20 kA
NZMN(H)(L)2-A...