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Description
2.9 Electronic trip unit ETU
This makes the power distribution system totally selective. Siemens protection devices are
designed for optimum coordination in order to achieve just that.
The 3WL10 and 3VA27 platform products were designed as an interface between
characteristics of a molded case circuit breaker and an air circuit breaker.
For optimum configuration, the Simaris software tools Simaris curves, powerconfig and
selectivity tables (see Chapter Reference documents (Page 10)) can be used.
You will find further information in the manual on selectivity, see Chapter Reference
documents (Page 10).
See also
Characteristic curves (Page 60)
2.9.3
Design of the electronic trip units
2.9.3.1
Electronic trip units of the 3-series
The following figure shows the maximum possible equipment of an ETU of the 3-series.
Depending on the ETU used, the number of rotary coding switches and LEDs can vary.
①
②
③
④
⑤
48
I
= x I
r
n
I
L
.7 5
sd
.8
S
3
.7
.8 5
2 .5
.6
.9
.5
2
.9 5
1 .5
.4
1
1
t
@ 6 xI
r
r
I
2
5
8
.4
3
1 0
2
.3
1 4
.2
1
2 1
.1
.7 5
2 5
O F F
Active LED ACT
DIP switch
Rotary coding switch with LED
Test and info button
Connection socket for test devices TD310, TD410, and TD420
= x I
n
I
= x I
i
n
3 .5
I
= x I
I
4
N
n
6
4
G
.4
3
8
6
2
.3
1 0
8
.2
1 .5
1 2
1 0
.1
O F F
1 5
O F F
t
t
sd
sd
.0 8
I
2
t
g
.1 5
.8
.2 2
.6
.3
.4
.4
.2
.1
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Equipment Manual, 10/2023, L1V30499596002-03
A C T
A C T
I
= x I
N
n
H z
.5
.6
6 0
.7
5 0
O F F
.8
5 0 %
1
1 0 0 %
2 0 0 %
t
g
.1
.2
.4
.6
.8
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