Siemens SENTRON 3WA1 - Appendix; Basic Settings of the Electronic Trip Unit on Delivery

3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
551
Appendix
A
A.1 Basic settings of the electronic trip unit on delivery
ETU300 electronic trip unit
The rotary coding switches of the ETU300 electronic trip unit have the following settings
when delivered ex works.
The tables below list the basic settings of the parameter sets for the ETU300 on delivery
from the factory.
ETU300 LSI, ETU300 LSIG
Protective function
Basic setting
L: Overload protection LT
Current setting I
r
0.4 x I
n
Tripping time t
r
at 6 x I
r
0.75 s
L: Overload protection LT, neutral conductor
Current setting I
rN
1.0 x I
n
S: Delayed short circuit protection ST
Current setting I
sd
OFF (tripping ST switched off)
Tripping time t
sd
0.08 s with ST characteristic: I
2
t
I: Instantaneous short-circuit protection INST
Current setting I
i
1.5 x I
n
Maintenance mode DAS+
Current setting I
i DAS+
1.5 x I
n
Digital input / output
Digital ETU input
Activate maintenance mode DAS+.
Digital ETU output
Maintenance mode DAS+