Eaton IZM32 Instruction Manual page 39

IZM32...V(P)...PXR20/25 Long Delay(L) and Short Delay(S) Curves
S-Protection with: I²t-Characteristic curve ON
10000
9000
8000
7000
6000
5000
4000
3000
2000
1000
900
800
700
600
500
400
300
200
100
90
80
70
60
50
40
30
20
10
9
8
7
6
5
4
3
2
1
.9
.8
.7
.6
.5
.4
.3
.2
.1
.09
.08
.07
.06
.05
.04
.03
.02
.01
Notes:
1. This curve shown as a multiple of the LONG PU setting(I
2. SDPU = 1.5x to 10x of I , have 100% ± 10% tolerance.
r
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.
1.5
0.5
1
0.5
Current in Multiples of Long Delay Pickup (I r )
). The actual pickup point occurs at 110% of the I
r
IZM32 / IN32 low voltage air circuit breaker MN013017EN May 2022 www.eaton.com
Section 5: Protective characteristic curves
24
15
7
4
2
6
3 10
, with ±5% tolerance.
r
0.5
0.4
0.3
0.1
35