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42
IZM32 / IN32 low voltage air circuit breaker
MN013017EN May 2022 www.eaton.com
Section 5: Protective characteristic curves
IZM32...V(P)...PXR20/25 Long Delay(L) Curves
L-Protection: I
1
t-Characteristic curve
Notes:
1. This curve shown as a multiple of the LONG PU setting(I
r
). The actual pickup point occurs at 110% of the I
r
, with ±5% tolerance.
2. SDPU = 1.5x to 10x of I
r
, have 100% ± 10% tolerance.
3. LD Time = 0.5s to 24s, have 100% +0 / -30% tolerance.
4. SD Slope = I²T. The short pickup points have ±10% tolerance.
time setting from 0.1s to 0.5s, with steps of 0.1s, except 0.2s.
tolerance is 100% +0 / -30% except 0. 1s, has tolerance 100% +0 / -40%.
5. I²
r
response time value projected to I²T line will determine the other break point and shape of the curve.
6. If long delay thermal memory is enabled, trip times may be shorter than indicated in this chart.
.01
.02
.03
.04
.05
.06
.07
.08
.09
.1
.2
.3
.4
.5
.6
.7
.8
.9
1
2
3
4
5
6
7
8
9 10
20
30
40
50
60
70
80
90 10
0
1
2
3
4
5
6
7
8
9
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
.1
.2
.3
.4
.5
.6
.7
.8
.9
Time
in
Se
conds
Current in Multiples of Long Delay Pickup (I
r
)
24
4
15
2
7
0.5
1.5
10
6
0.1
0.3
0.4
1
3
0.5