Technical data
66 IZMX circuit-breakers, INX switch-disconnectors
Tripping characteristics
CA01305001Z-EN www.eaton.com
IZMX16(40)…P… Tripping characteristics for professional protection
Digitrip 1150/1150i - G-Ground (Earth) Curves
Apply to Series NRX Type IZMX16 (NF) and IZMX40 (RF) Circuit Breakers.
This curve is for 50 Hz or 60 Hz applications.
Notes:
1. The end of the curve is determined by the interrupting rating of the circuit
breaker.
2. The curve is shown as a multiple of the Rating Plug (I
n
).
3. The Ground Fault settings have conventional 100 % ± 10 % as their pick up
points.
4. Except as noted, tolerances on current levels are ± 10 % of values shown in
chart.
5. The Ground Fault Pickup is limited to 1200 A setting for the Digitrip 1150 unit.
The Digitrip 1150i unit only has a minimum Earth Pickup setting starting
at 0.1 x I
n
.
6. Ground Slope: FLAT
Tolerance is +0 / -80 ms except
0.10 s setting band is 0.05 to 0.13
0.15 s setting band is 0.09 to 0.17
7. Ground Slope: I
2
T
I
2
t slope flattens out at 0.625 x I
n
for top of band with FLAT time minimum value
n prevailing for bottom of band.
The tolerance is +0 / -30 % for all settings except
0.10 s is +30 % -25%
0.15 s is +20 % -25%
0.20 s is +10 % -25%
Notes The total Instantaneous clearing times shown are conservative and consider the maximum response times of the trip unit, the circuit breaker open-
ing, and the interruption of the current under factors that contribute to worst case conditions, like: maximum rated voltages, single phase interrup-
tion, and minimum power factor. Faster clearing times are possible depending on the specific system conditions, the type of circuit breaker applied,
and if any arc reduction settings are employed.
8
9
5
4
7
6
2
3
10
t [s]
0.50.40.3
0.6
0.7
0.8
0.9
1
0.2
2
3
456
8
10
I/I
n
1
0.02
0.08
0.09
0.05
0.04
0.03
0.07
0.06
0.2
0.8
0.9
0.5
0.4
0.3
0.7
0.6
0.1
0.01
0.50 s
0.10 s
1230DIA-139
Max clearing time
Break point @ 0.625 x
I
n
to FLAT
Available GND PU Setting
0.24 to 1.0 x
I
n
±10%
with steps of 0.01
See Note 5
Min clearing time
for 0.1 s setting
See Note 7
2
Available I t Response
GROUND TIME
0.1 s to 0.5 s
with 0.01 s increments
0.06
0.08
8
9
5
4
7
6
1
2
3
0.01
0.05
0.07
0.09
0.1
0.02
0.08
0.09
0.05
0.04
0.03
0.07
0.06
0.2
0.8
0.9
0.5
0.4
0.3
0.7
0.6
0.
5
0.
4
0.
3
0.
6
0.
7
0.
8
0.
9
1
2
3
456
7
0.
2
I/I
n
t [s]
0.1
10
0.50 s
1230DIA-138
Available GND PU Setting
0.24 to 1. 0 x
I
n
±10%
with steps of 0.01
See Note 5
FLAT response for
GROUND TIME
See Note 6
Available FLAT response
GROUND TIME
0.1 s to 0.5 s
with 0.05 s increments
IZMX16(40)...P...