Figure 2-6: Time-Current Characteristic, Chart - Siemens sirius System Manual

Phase loss
sensitivity
Explosion protection
Characteristics
SIRIUS System Manual
GWA 4NEB 430 0999-02b
The phase loss sensitivity of the circuit breaker ensures that it is tripped in
good time in the event of the loss of a phase and the resulting overcurrents
in the other phases.
During normal operation, the device should have a three-pole load. To pro-
tect single-phase loads or direct current loads, all 3 main conducting paths
should be switched in series.
Note
In the case of a three-pole load, at 5 to 8 times the set current, the release
time deviates by a maximum of ± 20% and therefore complies with the
requirement of DIN VDE 0165 and EN 50019: 1977 +A1 to A5 and
DIN VDE 0165.
The tripping characteristic of the inverse-time delayed overload release
(thermal overload release, a-release) is valid for direct current and alternat-
ing current with frequencies of 0 to 400 Hz.
The characteristics are valid for tripping operations from a cold state. From a
warm state, the release times of the thermal releases are reduced to
approximately 25 %.
The tripping characteristics of the instantaneous electromagnetic overcur-
rent releases (short-circuit release, n-release) is based on the rated current
I , which in circuit breakers with adjustable overload releases is also the
n
upper value of the adjustment range.
The following is a chart of the time-current characteristic:
opening time
10 000
100
min
5000
60
s
40
2000
1000
10
500
5
200
2
100
1
50
20
10
5
two-pole
load
2
class 10
1
0,5
0,2
0,1
0,05
0,02
0,01
0,005
0,002
0,001
0,6 1 2 3 4
0,8

Figure 2-6: Time-current characteristic, chart

Time-current characteristics, current-limiting characteristics and I
ristics can be requested directly from your sales representative, if neces-
sary.
NSB00004
three-pole
load
class 20
three-pole
load
class 10
6 8 10 20 30 40 60 A 80 x n
current
3RV1 circuit breakers
2
t characte-
2-11