Siemens WL Series Selection And Application Guidelines

11
Low Voltage Circuit Breaker
Electronic trip units (ETU)
1 Extended Instantaneous Protection (EIP) allows the WL breaker to be applied at the withstand rating 3 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.
2 Ground Fault Module cannot be removed after installation.
Notes:
M = 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 at the trip unit.
G
Basic functions ETU748 ETU776
Long-time overcurrent protection 3 3
Function can be switched ON/OFF – –
Setting range I
R
= I
n
x ... 0.4, 0.45, 0.5, 0.55, 0.... 1 (step: 1A)
0.6, 0.65, 0.7, 0.8,
0.9, 1
Switch-selectable overload protection
(I
2
t or I
4
t dependent function) 3 3
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 3 (via slide switch) 3 (on/off via keypad or communications)
Phase loss sensitivity at t
sd
=20 ms (M) 3 (on/off via keypad or communications)
Neutral protection – 3
Function can be switched ON/OFF 3 (via slide switch) 3 (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 3 3
Function can be switched ON/OFF 3 (via rotary switch) 3 (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) 3 (via rotary switch) 3 (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 3 3
Function can be switched ON/OFF,
Extended Instantaneous Protection
is enabled when OFF – 3 (via keypad or communications)
Setting range I
i
= In x ... I
i
= I
cw
= EIP 1.5 x I
n
0.8 x I
cs
= OFF = I
cw
= EIP
Ground fault protection
2
O (field installable module) O (field installable module)
Trip and alarm function 3 3 (via keypad or communications)
Detection of the ground fault current
by residual summing method 3 3
Detection of the ground fault current
by direct sensing method 3 3
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) 3 3
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
WL Circuit Breaker selection and application guide

Siemens WL Series Specifications

General

Brand	Siemens
Model	WL Series
Category	Circuit breakers
Language	English