WL Circuit Break er
F unction ov er vie w of the electronic tr ip units
Basic functions ETU748 ETU776
Long-time ov ercurrent pro tection
F unction can be switched ON/OFF – –
Se tting range
I
R
=
I
n
x … 0.4, 0.45, 0.5, 0.55, 40-100% of In (Adjustable in Amps )
0.6, 0.65, 0.7, 0.8,
0.9, 1
Switch-selectable ov erload p rot ection
(
I
2
t or
I
4
t dependent function)
Se tting range of delay time clas s
t
R
at
I
2
t
(seconds) 2, 3.5, 5.5, 8, 10, 2 … 30 (step: 0.1s)
14, 17, 21, 25, 30
Se tting range of delay time
t
R
at
I
4
t
(seconds) 1, 2, 3, 4, 5 1 … 5 (step: 0.1s)
Thermal memor y
(via slide switch)
(on/off via key pad
or communications)
Phase los s sensitivity at
t
sd
=20ms (M)
(on/off via key pad
or communications)
N-conductor pro tection –
F unction can be switched ON/OFF (via slide switch)
(via key pad or communications)
N-conduct or se tting range
I
N
=
I
n
x … 0
.5 … 2, OFF
Shor t-time dela y ed ov ercurrent pro t ection
F unction can be switched ON/OF F
–
(via key pad or communications)
Se tting range
I
sd
=
I
n
x … 1.25, 1.5, 2, 2.5, 1.25 … 0.8 x I
cw
= max
3, 4, 6, 8, 10, 12 (step: 10A)
Se tting range of delay time
t
sd
,f ix ed
(seconds) M, 0.1, 0.2, 0.3, 0.4
M, 0.08 … 0.4, OFF (step: 0.001s)
Switch-selectable sho rt -t ime dela y
shor t-cir cuit p rot ection
(
I
2
t
dependent function) (via rot ar y coding switch) (via key pad or communications)
Se tting range of time dela y
t
sd
at
I
2
t
(seconds) 0.1, 0.2, 0.3, 0.4 0.1 … 0.4 (step: 0.001s)
Zone Selectiv e Int erlocking (ZSI) function per CubicleBUS module per CubicleBUS module
Instantaneous ov ercurrent pro tection
F unction can be switched ON/OFF ,
Ext ended Instantaneous P rot ection
is enabled when OFF –
(via key pad or communications)
Se tting range
I
i
=
I
n
x … –
I
i
=
I
cw
= EIP 1.5 x
I
n
…0.8 x
I
cs
= max, OFF=
I
cw
=EIP
Ground-fault pro tection O (field installable module) O (field installable module)
Tr ip and alarm function
(via key pad or communications)
De t ection of the ground fault curr ent
by r esidual summing me thod
De t ection of the ground fault curr ent
by dir ect summing me thod
Se tting range of the
I
g
f or trip A, B, C, D, E A … E (step: 1A)
Se tting range of the
I
g
f or alarm A, B, C, D, E A … E (step: 1A)
Se tting range of the delay time
t
g
(seconds) 0.1, 0.2, 0.3, 0.4, 0.5 0.1 … 0.5 (step: 0.001s)
Switch-selectable
ground fault p rot ection
(
I
2
t
/ fix ed)
Se tting range delay time
t
g
at
I
2
t
0.1, 0.2, 0.3, 0.4, 0.5 0.1 … 0.5 (step: 0.001s)
ZSI ground function per CubicleBUS module per CubicleBUS module
available
– not available
O optional
L
N
S
I
G
Extended Instantaneous Protection (EIP) allows the WL circuit breaker to be applied at the withstand rating of
the circuit breaker with minus 0% tolerance; this means there is no instantaneous override at all. EIP further
enables the circuit breaker to be applied up to the full instantaneous rating of the circuit breaker in systems
where the available fault current exceeds the withstand rating.
Ground Fault Module cannot be removed after installation.
2
Note: ETU776 settings via WLBDA, Modbus, or Profibus: 1A steps
Via ETU Keypad: Below 1000A: 10A steps 1000A-1600A: 50A steps
1600A-10000A: 100A steps Above 10000A, 1000A steps
1
3
Notes:
M = Motor protection setting indicates phase loss sensitivity is enabled. LT pick-up reduced 80% when phase unbalance > 50%. ST = 20 ms
Communications = Setting the parameters of the trip unit
via the Breaker Data Adapter, MODBUS, or PROFIBUS
Key pad = Direct input the trip unit
I
n
3
2
2
1
ed
-
on
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