Siemens SENTRON 3WA1 - Page 555

Appendix
A.1 Basic settings of the electronic trip unit on delivery
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
553
ETU600 electronic trip unit
The rotary coding switches of the ETU600 electronic trip unit have the following settings
when delivered ex works.
The tables below list the basic settings of the parameter sets for the ETU600 on delivery
from the factory.
ETU600 LSI, ETU600 LSIG, ETU600 LSIG Hi-Z
Protective function
Basic setting
L: Overload protection LT
Tripping
On
Current setting I
r
0.4 x I
n
Tripping time t
r
at 6 x I
r
0.5 s
Characteristic LT curve
I²t
Thermal memory
Off
Cooling time constant
18 x t
r
Phase failure detection
Off
Overload pre-alarm PAL
Off
Current setting I
r PAL
0.7 x I
r
Delay time t
r PAL
1.0 x t
r
L: Overload protection LT, neutral conductor
Tripping
Off
Current setting I
rN
0.2 x I
n
Current setting I
rN PAL
0.7 x I
N
S: Short-time-delayed short-circuit protection ST
Tripping
On
Current setting I
sd
0.6 x I
n
Tripping time t
sd
0.1 s
Characteristic ST curve
I
0
t
Reference point I
ST ref
8
Intermittent detection
Off