Technical data

68 IZMX circuit-breakers, INX switch-disconnectors
Tripping characteristics
CA01305001Z-EN www.eaton.com
IZMX16(40)…P… Tripping characteristics for professional protection
Digitrip 1150i - IEC-A Curves (Normal Inverse)
Apply to Series NRX Type IZMX16 (NF) and IZMX40 (RF) Circuit Breakers.
Normal Inverse & Short Delay Trip
This curve is for 50 Hz or 60 Hz applications.
Notes:
1. This curve is shown as a multiple of the PICKUP setting (I
r
). The TimeDial set-
ting combined with SHORT PU and SHORT TIME setting (shown in heavy lines)
depict the IEC-A response. The Instantaneous, shown as a separate response,
can be set to OFF.
2. For current > 1.2 x I
r
tolerance is (±15 %) or (-15 %, +90 ms), whichever is
larger. TimeDial curve goes to flat response at 14 x I
r
with a shorter time of
TimeDial function or SHORT TIME function prevailing if curves overlap.
The ShortTime function and the TimeDial function act independently and the
entire TimeDial curves continue to be active even after the curves intersect.
3. The actual pick up point occurs at 110 % of I
r
current, with a ±10 % tolerance.
The actual pick up point is indicated by rapid flashing of Unit Status LED on the
product.
The SHORT PU settings have conventional 100 % ± 10 % at their pick up point.
4. The end of the curve is determined by the interrupting rating of the circuit
breaker.
5. SHORT TIME: FLAT only
Tolerance is +0 / -80 ms of setting except
0.10 s setting is 0.06 to 0.13
0.15 s setting is 0.10 to 0.17
6. Curve applies from -20 °C to +55 °C ambient. Temperatures above 85 °C cause
automatic trip.
7. Minimum persistence refers to the time at which the breaker will not trip for
a given setting.
Notes These curves are comprehensive for IZMX40 = Series NRX - Type NF frame circuit breakers, including all frame sizes, ratings, and constructions.
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.
10
20
0.6
0.8
8
9
5
4
30
7
6
80
90
50
40
70
60
1
2
3
0.01
0.5
0.7
0.9
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
543
6
7
8
9
10
20
30
40 50 60
70
2
1 min
I/I
r
0.1
0.50 s
1.00
0.70
0.90
0.80
0.60
0.50
0.20
0.30
0.15
0.40
0.10
0.05
100
1230DIA-141
Adjustable PICKUP
0.5 to 1.0 x I
n
= I
r
with 0.05 increments
See Note 3
Adjustable TimeDial
Setting 0.05 to 1.00
With 0.05 increments
See Note 2
t [s]
Minimum persistence
See Notes 5, 7
Adjustable SHORT PU
2.0 x to 10 x I
r
With 0.5 increments
Adjustable
SHORT TIME
0.10 s to 0.50 s
With 0.05 increments
See Note 5
IZMX16(40)...P...