Technical data
64 IZMX circuit-breakers, INX switch-disconnectors
Tripping characteristics
CA01305001Z-EN www.eaton.com
IZMX16…P… Tripping characteristics for professional protection
Digitrip 1150/1150i - I-Instantaneous Curves Apply to Series NRX Type IZMX16 (NF) and IZMX40 (RF) circuit-breakers.
Instantaneous Trip
This curve is for 50 Hz and 60 Hz applications.
Notes:
1. The end of the curve is determined by the interrupting rating of the circuit
breaker.
2. This curve is shown as a multiple of the Rating Plug (I
n
).
3. The Instantaneous settings have conventional 100 % ±10 % as the pickup
points.
4. Total clearing times shown include the response times of the trip unit, the
breaker opening and the interruption of the current.
5. An additional, fixed High Instantaneous Trip function is provided in the circuit
breaker set to pickup at 90 kA Instantaneous peak current level. This protection
is functional even when the Instantaneous is set to the OFF position.
I-protection: For high short-circuit-protection for IZMX16 only
See Notes 5 ￫ Page 62.
I-protection: For high short-circuit-protection for IZMX40 only
See Notes 5 ￫ Page 62.
Notes The total Instantaneous clearing times shown are conservative and consider the maximum response times of the trip unit, the circuit breaker open-
ing, and the interruption of the current under factors that contribute to worst case conditions, like: maximum rated voltages, single phase interrup-
tion, and minimum power factor. Faster clearing times are possible depending on the specific system conditions, the type of circuit breaker applied,
and if any arc reduction settings are employed.
3
4
6
8
10
2
12
0.6
0.8
8
9
5
4
7
6
1
2
3
0.01
0.5
0.7
0.9
1
0.02
0.08
0.09
0.05
0.04
0.03
0.07
0.06
0.2
0.8
0.9
0.5
0.4
0.3
0.7
0.6
543
6
7
8
9
10
20
30
40 50 60
70
2
I/I
n
t [s]
0.1
10
1230DIA-135
Available Adjustable
Instantaneous
Setting 2 to 12 x
I
n
±10%
See Notes 1, 2, 3, 4
10
20
30
40
100
200
300
400
500
50
60
70
80
90
1000
600
700
800
900
t [s]
I
RMS
[kA]
0.02
0.08
0.09
0.05
0.04
0.03
0.07
0.06
0.1
0.01
1230DIA-136
100 kA
85 kA65 kA
0.01
10
20
30
40
50
60
70
90
0.02
0.08
0.09
0.05
0.04
0.03
0.07
0.06
t [s]
0.1
1230DIA-152
100
200
900
700
500
300
80
1000
800
600
400
I
RMS
[kA]
IZMX16...P...