WL Circuit Breakers - Siemens

Functional Overview of Trip Unit System
WL Circuit Breaker
Basic Functions ETU725 ETU727 ETU745
Parameter sets
Selectable between
parameter set A and B – – –
LCD
LCD, alphanumeric (4-line) – – O
LCD, graphic – – –
Communication
CubicleBUS integrated – – P
Communication capability via
PROFIBUS/MODBUS – – P
Metering function
Voltage, Power, Harmonics
and Parameterization – – P
Display by LED
Trip unit active P P P
Alarm P P P
ETU error P P P
L trip P P P
S trip P P P
I trip P P P
N trip – P P
G trip – P P (only with ground fault module)
G alarm – – P (only with ground fault module)
Tripped by extended protection or
protective relay function – – P
Communication – – P
Signal contacts with external CubicleBUS modules
(Opto or relay)
Overcurrent warning – – P
Load shedding ON/OFF – – P
Early signal of long-time trip (200 ms) – – P
Temperature alarm – – P
Phase unbalance – – P
Instantaneous trip – – P
Short-time trip – – P
Long-time trip – – P
Neutral conductor trip – – P
Ground fault protection trip – – P (only with ground fault module)
Ground fault alarm – – P (only with ground fault module)
Auxiliary relay – – P
ETU error – – P
Step for Settings via Communications or
ETU Key Pad
from … to step
0 … 1 0.1
1 … 100 1
100 … 500 5
500 … 1000 10
1000 … 1600 50
1600 … 10000 100
10000 … max 1000
WL PROFIBUS/MODBUS Communication and Electronic Accessories
Setting range of the Ig
Frame Size II Frame Size III
A 100 A 400 A
B 300 A 600 A
C 600 A 800 A
D 900 A 1000 A
E 1200 A 1200 A
P available
– not available
O optional
SECTION 2
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