3WL Air Circuit Breakers
35
Siemens · 2012
3WL Air Circuit Breakers/Non-Automatic Air Circuit Breakers up to 6300 A (AC)
Project planning aids
Every release type and every setting has its own characteristic
curve. Only a selection is shown in the following. The character-
istic 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 trip-
ping operation. If the overcurrent tripping occurs immediately af-
ter switch on and the release is therefore not yet enabled, the
opening time is extended, depending on the level of the overcur-
rent by up to 15 ms. In order to determine the total 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 table 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 (ETU76B
with graphics display up to +55 °C). An extended
tolerance band can apply at these temperatures.
3WL circuit breaker with ETU45B and ETU76B release, L characteristic
curve
3WL circuit breaker with ETU45B and ETU76B release, I characteristic
curve
1)
Sizes I and II: 100 ... 1200 A
Size III: 400 ... 1200 A.
3WL circuit breaker with ETU45B and ETU76B release, G characteristic
curve
3WL circuit breaker with ETU76B release, S characteristic curve
Further characteristic curves are shown in the manual and the
planning and configuring tool SIMARIS deSign, or ask your
Siemens contact person.
Tolerances for the set currents
L: Tripping operations between 1.05 and 1.2 × 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: <50 ms
G: –0 %, +60 ms or -0 %, 10 % for tripping times greater than 600 ms
0,01
0,1
1
10
100
1000
10000
0,1
1 10 100
NSE0_01522a
[s]
R
/
n
0,4 ... 1,0 x
n
R
2
4
2 ... 30s for
4
= const
2
= const
1 ... 5s for
Opening time
0,01
0,1
1
10
100
1000
10000
0,1
1101
NSE0_01524a
[s]
/
n
i
1,5 x
n
... 0,8 x
cs
/
cs
Opening time
0,01
0,1
1
10
100
1000
10000
100
1000 10000 100000
NSE0_01525a
g
0,1 ... 0,5 s
g
[s]
100 ... 1200 A
1)
A
Opening time
2
= const
0,01
0,1
1
10
100
1000
10000
0,1
1101
NSE0_01526a
[s]
/
n
/
cw
sd
0,02 ... 4 s
2
sd
0,1 ... 0,4 s
1,25 x
n
... 0,8 x
cw
sd
Opening time
= const
= const
© Siemens AG 2011
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