35
Siemens · 10/2014
3WL Air Circuit Breakers
3WL air circuit breakers/non-automatic air circuit breakers up to 6300 A (AC), IEC
General data
For the setting range of the operating current I
g
, see page 36.
Protection functions ETU15B ETU25B ETU27B
Parameterization by
D D D & S
Function overview of the electronic trip system
L
Overload protection
Function can be switched on/off
✓
--
✓
--
✓
--
Setting range
I
R
= I
n
× ... 0.5-0.55-0.6-0.65-0.7-
0.75-0.8-0.85-0.9-1
0.4-0.45-0.5-0.55-0.6-
0.65-0.7-0.8-0.9-1
0.4-0.45-0.5-0.55-0.6-
0.65-0.7-0.8-0.9-1
Switchable overload protection
(
I
2
t- or
I
4
t-dependent function)
-- -- --
Setting range for time-lag class t
R
at
I
2
t 10 s fixed 10 s fixed 10 s fixed
Setting range for time-lag class t
R
at
I
4
t -- -- --
Thermal image can be switched on/off -- -- --
Phase failure sensitivity -- At t
sd
= 20 ms (M) At t
sd
= 20 ms (M)
N
N-conductor protection -- -- ✓
Function can be switched on/off -- -- ✓
N conductor setting range
I
N
=
I
n
× ... -- -- 1
S
Short-time delayed short-circuit protection -- ✓✓
Function can be switched on/off -- -- --
Setting range
I
sd
=
I
n
× ... -- 1.25-1.5-2-2.5-3-4-6-8-10-12 1.25-1.5-2-2.5-3-4-6-8-10-12
Setting range for delay time t
sd
-- 0-M-100-200-300-400 ms 0-M-100-200-300-400 ms
Switchable short-time delayed short-circuit protection
(
I
2
t-dependent function)
-- -- --
Setting range for delay time t
sd
at
I
2
t -- -- --
ZSI function -- -- --
I
Instantaneous short-circuit protection ✓✓ ✓
Function can be switched on/off -- -- --
Setting range
I
i
=
I
n
× ... 2-3-4-5-6-7-8 Fixed for
I
i
20
I
n
, max. 50
kA
Fixed for
I
i
20
I
n
,
max. 50 kA
G
Ground-fault protection -- -- ✓ Fixed mounted
Tripping and alarm functions -- -- --
Tripping function can be switched on/off -- -- ✓
Alarm function can be switched on/off -- -- --
Detection of the ground-fault current through summation
current formation with int. or ext. N conductor transf.
-- -- ✓
Detection of ground-fault current through external
current transformer
-- -- --
Setting range of the operating current
I
g
for tripping -- -- A-B-C-D-E
Setting range of the operating current
I
g
for alarm -- -- --
Setting range of the delay time
t
g
-- -- 100-200-300-400-500 ms
Switchable ground-fault protection characteristic
curve (
I
2
t-dependent function)
-- -- --
Setting range for delay time t
g
at
I
2
t -- -- --
ZSI-G function -- -- --
Parameter set changeover
Switchable between parameter set A and B -- -- --
LCD
Alphanumeric LCD (4-line) -- -- --
Graphical LCD (24 V, external power supply required) -- -- --
Communication
CubicleBUS integrated -- -- --
Communications capability via PROFIBUS DP -- -- --
Metering function
Metering function capab.with metering function Plus -- -- --
LED display
Electronic trip unit active ✓ ✓ ✓
Alarm ✓ ✓ ✓
ETU fault ✓ ✓ ✓
L tripping operation -- ✓✓
S tripping operation -- ✓✓
I tripping operation -- ✓ ✓
N tripping operation -- -- ✓
G tripping operation -- -- ✓
G alarm -- -- --
Tripping operation as a result of ext. protect. function -- -- --
Communication -- -- --
Signals from signaling switches with external CubicleBUS modules (relays)
Overload warning -- -- --
Load shedding, load absorbing -- -- --
Leading signal overload trip 200 ms -- -- --
Temperature alarm -- -- --
Phase unbalance -- -- --
Instantaneous short-circuit trip -- -- --
Short-time delayed short-circuit trip -- -- --
Overload trip -- -- --
Neutral conductor trip -- -- --
Ground-fault protection trip -- -- --
Ground-fault alarm -- -- --
Auxiliary relay -- -- --
ETU fault -- -- --
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