Siemens SENTRON 3WL10 - Design of the Electronic Trip Units; Electronic Trip Units of the 3-Series

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 con󹪝guration, the Simaris software tools Simaris curves, powercon󹪝g and
selectivity tables (see Chapter Reference documents (Page10)) can be used.
You will 󹪝nd 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 󹪝gure 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.
.75
.7
.6
.5
.4
.8
.85
.9
.95
1
3
2.5
2
1.5
1
3.5
4
6
8
10
4
3
2
1.5
OFF
6
8
10
12
15
.4
L
S
I
G
.3
.2
.1
OFF
.5
.6
.7
.8
1
5
3
2
1
.75
8
10
14
21
25
.4
.3
.2
.1
OFF
.08
.15
.22
.3
.4
.8
.6
.4
.2
.1
.1
.2
.4
.6
.8
I
r
= x I
n
I
sd
= x I
n
I
i
= x I
n
I
N
= x I
n
I
N
= x I
n
ACT
OFF
50%
100%
200%
Hz
60
50
t
r
@6xI
r
I
2
t
sd
t
sd
I
2
t
g
t
g
ACT





① Active LED ACT
② DIP switch
③ Rotary coding switch with LED
④ Test and info button
⑤ Connection socket for test devices TD310, TD410, and TD420
Description
2.9Electronic trip unit ETU
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
48 Equipment Manual, 10/2023, L1V30499596002-03