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IZM63 / IN63 low voltage air circuit breaker
MN013014EN May 2021 www.eaton.com.cn
Section 5: Protective characteristic curves
Section 5: Protective Characteristic Curves
Notes:
1. Short slope: Flat, the actual pickup point has 100% ±10% tolerance.
2. Long delay I²T slopes flattens out at 6x of I
r
.
3. Short time delay from 0(50ms) to 0.5s, with +0 / -80ms tolerance except 0.1s and 0s setting
0.1s setting, trip time is 0.06s to 0.1s
0s settting, nominal clear time is 60ms with auxiliary power and 120ms without.
4. If long delay thermal memory is enabled, trip times may be shorter than indicated in this chart.
5. Curves applies from -20°C to +70°C ambient. Temperatures above +85°C will cause over temperature trip.
6. This curve is for 50Hz, 60Hz applications.
7. These curves are comprehensive for series IZM63 / IN63 circuit 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
IZM63 / IN63...V(P)...PXR20/25 Long Delay(L) and Short Delay(S) Curves
L-Protection: I²t-Characteristic curve and S-Protection: Flat characteristic curve
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.2
.3
.4
.5
.6
.7
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.9
.01
.02
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1
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
1
2
3
4
5
6
7
8
9
10
20
30
40
50
60
70
80
90
100
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800
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5000
6000
7000
8000
9000
10000
Ti
m
e
in
S
ec
ond
s
Current in Multiples of Long Delay Pickup (I
r
)
1
2
3
24
0.5
1
2
4
7
15
0.5
1.5
7
6
5
4
3
2.5
2
8
10
0.4
0
0.1
0.2
0.3
