38
IZM32 / IN32 low voltage air circuit breaker
MN013017EN May 2022 www.eaton.com
Section 5: Protective characteristic curves
IZM32...V(P)...PXR20/25 Ground(G) Curves
G: Ground fault protection - Flat characteristic curve
Notes:
1. Ground PU setting from 0.2 to 1.0 of I
n
with steps of 0.2 , have tolerance of 100% ± 10%.
2. Ground Flat time from 0.1s to 0.5s, with 0.1s increments.
3. Ground slope: Flat, trip time tolerance is +0 / -80ms for all settings except 0.1s setting is 0.06s to 0.1s.
4. The curve is shown as a multiple of the Current Rating (I
n
).
5. The end of the curve is determined by the interrupting rating of the circuit breaker.
6. Curves applies from -20°C to +70°C ambient. Temperatures above +85°C will cause over temperature trip.
7. This curve is for 50Hz, 60Hz applications.
8. These curves are comprehensive for series IZM breakers including all frame sizes, ratings, and constructions.
The total clearing times shown include the response time for trip unit, the breaker opening and the interruption of the current.
.1
.2
.3
.4
.5
.6
.7
.8 .9
.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
1
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
Current in Multiples of Rating(I
n
)
0.2
0.2
0.4
0.6
0.8
1.0
0.1
0.3
0.4
0.5
