Section 5: Protective Characteristic Curves - Eaton IZM32 Instruction Manual

Section 5: Protective characteristic curves

Section 5: Protective Characteristic Curves
IZM32...V(P)...PXR20/25 Long Delay(L) and Short Delay(S) Curves
L-Protection: I²t-Characteristic curve and S-Protection: Flat characteristic curve
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. Short slope: Flat, the actual pickup point has 100% ±10% tolerance.
2. Long delay I²
34 IZM32 / IN32 low voltage air circuit breaker MN013017EN May 2022 www.eaton.com
0.5
1
2
1.5
Current in Multiples of Long Delay Pickup (I
.
r
24
15
7
10
2 4
3
7
5
4
8
2.5
6
)
r
0.5
0.4
0.3
0.2
0.1
0