Configuration Manual for Catalog LV 10.1 · 2012 - Siemens

3WL Air Circuit Breakers
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
Project planning aids
© Siemens AG 2011
■ Characteristic curves 2)
Every release type and every setting has its own characteristic
curve. Only a selection is shown in the following. The characteristic
curves each show the largest and smallest setting range of
3WL circuit breakers with 1000 A rated current at 500 V rated
voltage with various releases. In order to obtain a complete tripping
characteristic, the relevant parts of the characteristics have
to be combined. The characteristic curves show the behavior of
the release when it is activated by a current that is already flowing
before the tripping operation. If the overcurrent tripping occurs
immediately after switch on and the release is therefore not
yet enabled, the opening time is extended, depending on the
level of the overcurrent by up to 15 ms. In order to determine the
break-times of the circuit breakers, approximately 15 ms must
be added to the opening times shown for the arcing time.
Refer to the following legend for tolerances.
The characteristic curves shown apply to ambient temperatures
at the circuit breaker between -5 and +55 °C. The release can
be operated at ambient temperatures of -20 to +70°C.
An extended tolerance band can apply at these temperatures.
[s]
Opening time
10000
1000
100
10
R min
0,4 ... 1,0 x n
R max
1
sd min
1,25 ... 12 x n
sd max
sd max
0,1
0 ... 0,4 s sd min
i i > 20 x n
max. 50 kA
0,01
0,1 1 10 100
/ n
3WL circuit breaker with ETU25B release,
LSI characteristic curve
[s]
Opening time
10000
1000
100
10
g min
g max
NSE0_01520
NSE0_01521
[s]
Opening time
10000
1000
100
10
1
0,1
0,01
0,1 1 10 100
/ n
3WL circuit breaker with ETU15B release
[s]
Opening time
R min
R max
0,5 ... 1,0 x n
i min
2 ... 8 x n
3WL circuit breaker with ETU27B release,
LSIN characteristic curve
[s]
Opening Time
10000
1000
100
10
1
0,1
i max
0,01
0,1 1 10 100
/ n
10000
1000
100
10
R min
0,4 ... 1,0 x n
N
sd min
R max
1,25 ... 12 x n
sd
0 ... 0,4 s
sd max
2 sd = const
i
sd max
sd min
i > 20 x n
max. 50 kA
NSE0_01527
NSE0_01519
NSE0_01523a
1,25 ... 12 x n
2 sd
1
0,1
100 ... 1200 A 1) 0,1 ... 0,5 s
g max
g min
0,01
100 1000 10000 100000
A
3WL circuit breaker with ETU27B release,
G characteristic curve
Tolerances for the set currents
L: Tripping operations between 1.05 and 1.2 x I R
S: –0 %, +20 %
I: –0 %, +20 %
G: –0 %, +20 %
Tolerances for the tripping times
L: –20 %, +0 % for I 2 t characteristic curve
S: –0 %, +60 ms or -0 %, 10 % for tripping times greater than 600 ms
I: