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18/26 IZM circuit-breakers, IN switch-disconnectors
Selectivity: incoming circuit-breaker, outgoing circuit-breaker
2010 CA08103002Z-EN
www.eaton.comSelectivity: incomingcircuit-breaker,outgoingcircuit-breaker
I
n
: Rated operational current
I
u
: Rated uninterrupted current
I
Icu
: Rated short-circuit breaking
capacity
I
i
: Set value non-delayed short-circuit
releases
Selectivity 415 V AC
between circuit-breakers enables the
separate disconnection of faulty system sec-
tions.
Selectivity exists between incoming circuit-
breaker 1 and outgoing circuit-breaker 2 if,
only outgoing breaker 2 trips at position 2
during a short-circuit.
System sections 3 and 4 remain operational.
Selection:
Provided that the short-circuit current does not exceed those
values specified (I
cc rms
).
These details represent the limits of selectivity.
Both circuit-breakers will switch off with higher short-circuit
currents.
On IZM circuit-breakers with V, U, D releases, the delay time t
sd
must be at least 100 ms longer than the delay time of the next
downstream levels (2, 3, 4).
2
1
3 4
Incoming
circuit-
breaker (1)
IZMX16...-A
IZMX16...-V
I
n
[A]
630 630 630 800 800 800 1000 1000 1000 1250 1250 1250 1600 1600 1600 630 630 630 800 800 800
I
cu
[kA] 42 50 65 42 50 65 42 50 65 42 50 65 42 50 65
42 50 65 42 50 65
I
i
[A]
6300 6300 6300 8000 8000 8000 10000 10000 10000 12500 12500 12500 16000 16000 16000 7560 7560 7560 9600 9600 9600
Outgoing
circuit-
breaker (2)
I
u
[A]
I
cu2(415V)
[kA]
B N H B N H B N H B N H B N H B N H B N H
Prospective short-circuit current (I
cc rms
in kA)
NZMB(C)(N)
(H)1-A(M)…
20 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
25 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
32 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
40 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
50 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
63 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
80 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
100 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
125 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
160 25 - 100 6 6 6 9 9 9 15 15 15 T(25) T(25) T(25) T T T(50) T T T T T T
NZMB(C)(N)
(H)2-A(M)(V)...
20 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
25 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
32 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
40 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
50 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
63 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
80 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
90 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
100 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
125 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
140 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
160 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
200 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
220 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
250 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
300 25 - 150 8 8 8 10 10 10 18 18 18 T(30) T(30) T(30) T T T
T T T T T T
NZMC(N)(H)
3-A(M)(V)…
220 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
250 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
320 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
350 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
400 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
450 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
500 36 - 150 6 6 6 7 7 7 9 9 9 12 12 12 18 18 18
T T T T T T
630 36 - 150 – – – 7 7 7 9 9 9 12 12 12 18 18 18
– – – T T T
NZMN(H)
4-A(M)(V)…
550 50 - 100 6 6 6 7 7 7 9 9 9 12 12 12 15 15 15
T T T T T T
630 50 - 100 – – – 7 7 7 9 9 9 12 12 12 15 15 15
– – – T T T
800 50 - 100 – – – – – – 9 9 9 12 12 12 15 15 15
– – – – – –
875 50 - 100 – – – – – – 9 9 9 12 12 12 15 15 15
– – – – – –
1000 50 - 100 – – – – – – – – – 12 12 12 15 15 15
– – – – – –
1250 50 - 100 – – – – – – – – – – – – 15 15 15
– – – – – –
1400 50 - 100 – – – – – – – – – – – – 15 15 15
– – – – – –
1600 50 - 100 – – – – – – – – – – – – – – –
– – – – – –
Notes
B = Basic switching capacity, N = Normal switching capacity, H = High switching capacity, T = Total selectivity
IZMX16…