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Communication-capable Circuit Breakers
WL Circuit Breaker
Functional overview of the trip unit system
Basic Functions
I n
L
N
S
I
G
1
Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating
of the breaker with minus 0% tolerance; that means no instantaneous override whatsoever. EIP further
enables the circuit breaker to be applied up to the full instantaneous rating of the breaker on systems
where the available fault current exceeds the withstand rating.
Ground Fault Module cannot be removed after installation.
2
2/3
Long-time overcurrent protection
Function can be switched ON/OFF
Setting range I R = I n x ...
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)
Setting range of time delay t R at I 4 t
(seconds)
Thermal memory
Phase loss sensitivity
Neutral protection
Function can be switched ON/OFF
N-conductor setting range I N = I n x ...
Short-time delayed overcurrent protection
Function can be switched ON/OFF
Setting range I sd = I n x ...
Setting range of time delay t sd , fixed
(seconds)
Switch-selectable short-time delay
short-circuit protection
( I 2 t dependent function)
Setting range of time delay t sd at I 2 t
(seconds)
Zone Selective Interlocking (ZSI) function
Instantaneous overcurrent protection
Function can be switched ON/OFF,
Extended Instantaneous Protection
is enabled when OFF
Setting range I i = I n x ...
2
Ground fault protection
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
Setting range of the I g for alarm
Setting range of the time delay t g
(seconds)
Switch-selectable
ground fault protection
( I 2 t / fixed)
Setting range time delay t g at I 2 t
ZSI ground function
ETU725
ETU727
–
–
0.4, 0.45, 0.5, 0.55,
0.4, 0.45, 0.5, 0.55,
0.6, 0.65, 0.7, 0.8,
0.6, 0.65, 0.7, 0.8,
0.9, 1
0.9, 1
–
–
10s, set at 6 x I r
10s, set at 6 x I r
–
–
–
–
at t sd =20 ms (M)
at t sd =20 ms (M)
–
–
(via slide switch)
–
1
–
–
1.25, 1.5, 2, 2.5,
1.25, 1.5, 2, 2.5,
3, 4, 6, 8, 10, 12
3, 4, 6, 8, 10, 12
0, 0.02 (M), 0.1,
0, 0.02 (M), 0.1,
0.2, 0.3, 0.4
0.2, 0.3, 0.4
– fixed only
– fixed only
–
–
–
–
–
–
I i = 0.8 x I cw
I i = 0.8 x I cw
50kA max
50kA max
–
(standard)
–
–
–
–
–
–
A, B, C, D, E
–
–
–
0.1, 0.2, 0.3, 0.4, 0.5
–
–
–
–
–
–
WL PROFIBUS Communication and Electronic Accessories • July 2004
ETU745
–
0.4, 0.45, 0.5, 0.55, 0.6,
0.65, 0.7, 0.8, 0.9, 1
2, 3.5, 5.5, 8, 10,
14, 17, 21, 25, 30
1, 2, 3, 4, 5
(via slide switch)
at t sd =20 ms (M)
(via slide switch)
0.5 ... 1
(via rotary switch)
1.25, 1.5, 2, 2.5,
3, 4, 6, 8, 10, 12
0.02 (M), 0.1, 0.2,
0.3, 0.4, OFF
(via rotary switch)
0.1, 0.2, 0.3, 0.4
per CubicleBUS module
(via rotary switch)
1.5, 2.2, 3, 4, 6, 8, 10, 12
1
0.8 x I
= max, OFF= I
=EIP
cw
cw
(field installable module)
O
A, B, C, D, E
A, B, C, D, E
0.1, 0.2, 0.3, 0.4, 0.5
0.1, 0.2, 0.3, 0.4, 0.5
per CubicleBUS module
available
–
not available
optional
O
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