Section 6: Protective Characteristic Curves - Eaton IZM97 Instruction Manual

Section 6: Protective Characteristic Curves

IZM97(99)...V(U)...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 I²T slopes flattens out at 6x of I
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 +50°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 IZM97/99 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
New generation IZM97, 99 low voltage air circuit breaker instruction manual MN013010EN February 2020 www.eaton.com.cn
0.5
1
2
1.5
Current in Multiples of Long Delay Pickup (I
.
r
Section 6: Protective characteristic curves
24
15
7
10
2 4
3
7
5
4
8
2.5
6
0.5
0.4
0.3
0.2
0.1
0
)
r
77