14 WL Circuit Breaker Selection and Application Guide
WL Circuit Breaker
ETU Function Overview
2
Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating available
of the breaker with minus 0% tolerance; that means no instantaneous override whatsoever. EIP further – not available
enables the circuit breaker to be applied up to the full instantaneous rating of the breaker on systems
o optional
where the available fault current exceeds the withstand rating.
3
Ground Fault Module cannot be removed after installation.
4
Notes:
M = indicates phase loss sensitivity is enabled. LT pick-up reduced 80% when phase unbalance > 50%. ST = 20 ms
Key pad = Direct input at the trip unit.
L
N
S
I
G
1
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
Basic functions ETU748 ETU776
Long-time overcurrent protection
Function can be disabled – –
Setting range I
R
= I
n
x ... 0.4, 0.45, 0.5, 0.55, 40-100% of
I
n
(Adjustable in Amps
1
)
0.6, 0.65, 0.7, 0.8,
0.9, 1
Switch-selectable overload protection
(I
2
t or I
4
t dependent function)
Setting range of time delay class t
R
at I
2
t
(seconds) 2, 3.5, 5.5, 8, 10, 2...30 (step; 0.1s)
14, 17, 21, 25, 30
Setting range of time delay t
R
at I
4
t
(seconds) 1, 2, 3, 4, 5 1...5 (step; 0.1s)
Thermal memory
(via slide switch) (on/off via keypad or communications)
Phase loss sensitivity at t
sd
=20 ms (M) (on/off via keypad or communications)
Neutral protection
Function can be disabled
(via slide switch) (on/off via keypad or communications)
N-conductor setting range I
N
= I
n
x ... 0.5 ... 1 OFF 0.5 ... 2 OFF
Short-time delayed overcurrent protection
Function can be switched ON/OFF
(via rotary switch) (on/off via keypad or communications)
Setting range I
sd
= I
n
x ... 1.25, 1.5, 2, 2.5, 1.25... 0.9 x I
cw
= max
3, 4, 6, 8, 10, 12 (step: 10A)
Setting range of time delay t
sd
, fixed
(seconds) M, 0.1, 0.2, 0.3, 0.4 M, 0.08... 04, OFF (step: 0.001s)
Switch-selectable short-time delay
short-circuit protection
(I
2
t dependent function) (via rotary switch) (via keypad or communications)
Setting range of time delay I
sd
at I
2
t
(seconds) 0.1, 0.2, 0.3, 0.4 0.1... 0.4 (step 0.001s)
Zone Selective Interlocking (ZSI) function per CubicleBUS module per CubicleBUS module
Instantaneous overcurrent protection
2
Function can be disabled,
Extended Instantaneous Protection
is enabled when OFF –
(via keypad or communications)
Setting range I
i
= In x ... I
i
= I
cw
= EIP 1.5 ...
0.8 x I
cs
= MAX OFF = I
cw
= EIP
Ground fault protection
3
O (field installable module) O (field installable module)
Trip and alarm function
Detection of the ground fault current
by residual summing method
Detection of the ground fault current
by direct sensing method
Setting range of the I
g
for trip A, B, C, D, E A... E (step: 1A)
Setting range of the I
g
for alarm A, B, C, D, E A... E (step: 1A)
Setting range of the time delay t
g
(seconds) 0.1, 0.2, 0.3, 0.4, 0.5 0.1...0.5 (step: 0.001s)
Switch-selectable
ground fault protection
(I
2
t / fixed)
Setting range time delay tg 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
Courtesy of NationalSwitchgear.com
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