User Manual

Description
2.4 Electronic trip unit ETU600
3WA Air Circuit Breakers
Equipment Manual, 05/2021, 92310000002-03
95
ETU600 LSIG
Protective function
Setting range
G: Ground-fault protection GF
Tripping
Can be switched on/off
Method of ground-fault detection Residual Detection of the ground-fault current
through calculation of the total current
in all phases of the N-conductor
Direct Direct measurement of the ground-fault
current using a current transformer
Dual UREF protection zone: Detection of the
ground-fault current through calcula-
tion of the total current
REF protection zone:
Measurement of the ground-fault cur-
rent using an external current trans-
former
Characteristic GF curve
with LSIG GFx option plug
I
0
t / I
2
t / I
4
t / I
6
t
Current setting Ig
with LSIG GFx option plug
Residual acquisition method Depending on the size:
• Size 1 / 2: 100 … 2000 A
• Size 3: 400 … 2000 A
Direct acquisition method
15 … 2000 A
Tripping time t
g
For I
x
t = OFF
0 … 5 s
For I
x
t = ON at 3 x I
g
0 … 30 s
Intermittent acquisition
Can be switched on/off
G: Ground-fault GF alarm
Alarm
Can be switched on/off
Current setting Ig alarm
with LSIG GFx option plug
Residual acquisition method Depending on the size:
• Size 1 / 2: 100 … 5000 A
• Size 3: 400 … 5000 A
Direct acquisition method
15 … 5000 A
Alarm time t
g alarm
0 … 0.5 s