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IZM32 / IN32 low voltage air circuit breaker
MN013017EN May 2022 www.eaton.com
Section 5: Protective characteristic curves
IIZM32/IZM63...V(P)...PXR20/25 Instantaneous(I) Curves
Instantaneous Trip at High Fault Currents
Notes:
1. Fixed High Instantaneous Trip function is provided in the circuit breaker for Series IZM32 set to pickup at 90kA.
Instantaneous peak current level. The tolerance is 100% ±10% as the pickup points.
3. This protection is functional even when the Instantaneous is set to the OFF position.
2. The peak current level setting for IZM63 is fixed at 176kA.
4. The PXR will light the Instantaneous LED for a High Instantaneous trip.
5. The total Instantaneous clearing times shown are conservative and consider the maximum response times of the trip unit, the circuit breaker opening,
and the interruption of the current under factors that contribute to worst case conditions, like:
10
20
30
40
50
60
70
80
90
10
0
20
0
30
0
40
0
50
0
60
0
70
0
80
0
90
0
10
00
.01
.02
.03
.04
.05
.06
.07
.08
.09
.1
.2
.3
.4
.5
.6
.7
.8
.91
2
3
4
5
6
7
89
10
20
30
40
50
60
70
80
90
100
200
300
400
500
600
700
800
900
1000
2000
3000
4000
5000
6000
7000
8000
9000
10000
Time
in
Se
conds
Instantaneous Asymmetrical Peak Current (kA)
90kA
176kA
