Brochure

3RV1 Circuit Breaker/MSP
SIRIUS System Manual
GWA 4NEB 430 0999-02 DS 01
2-11
Characteristics 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 can be reduced up to 75 % depending on the
motor current and the ambient temperature.
The tripping characteristics of the instantaneous electromagnetic overcur-
rent releases (short-circuit release, n-release) is based on the rated current
I
n
, which in the circuit breaker/MSPs with adjustable overload releases is
also the upper value of the adjustment range.
The following is a chart of the time-current characteristic:
Fig. 2-6: Time-current characteristic, chart
Time-current characteristics, current-limiting characteristics and I
2
t charac-
teristics can be requested directly from your sales representative, if neces-
sary.
10
5
2
1
10 000
5000
2000
1000
500
200
100
50
20
10
5
0,2
1
0,5
0,02
0,1
0,05
0,002
0,01
0,005
100
60
40
2
0,6
0,8
12346810
0,001
20 30 40 80 x
n
NSB 00004a
min
s
60
Current
two-pole
load
Class 10
three-pole
load
Class 10
Opening time
three-pole
load
Class 20