308 / 582
BETA Protecting
Overvoltage Protection Devices
Configuration
6/22
Siemens ET B1 · 10/2008
6
*
You can order this quantity or a multiple thereof.
Dimensioning of conductor cross-sections
The different conductor cross-sections (Lq 1 to Lq 3) must be
dimensioned according to the rated current of the miniature
circuit breaker or the fuse.
Series connection
a) Protection of the SPD over miniature circuit breakers
a) Protection of the SPD over fuses
PAS = equipotential bonding strip
Parallel connection
a) Protection of the SPD over miniature circuit breakers
a) Protection of the SPD over fuses
Conductor cross-sections for lightning arresters and combination
surge arresters with series connection
MCB/fuse
upstream
connected
Lq 1
Lq 2
Lq 3
[
gL/gG]
[
mm
2
]
[
mm
2
]
25
6
16
35
10
16
50
16
16
63
25
25
80
25
25
100
35
35
125
35
35
PAS
PE
I2_10791a
S
P
D
MCB
Lq2
Lq1
Lq3
L1
PAS
PE
L1
F1
Lq2
Lq3
I2_10794a
S
P
D
Lq1
Conductor cross-sections for lightning arresters and combination
surge arresters with parallel connection
MCB/fuse
upstream
connected
Lq 1
Lq 2
Lq 3
Fuse F 2
[
gL/gG]
[
mm
2
]
[
mm
2
]
[
mm
2
]
[
A; gL/gG]
25
6
6
16
/
32
10
10
16
/
50
16
16
16
/
63
25
25
25
/
80
35
25
35
/
100
50
25
35
/
125
50
25
35
/
160
95
25
35
/
200
120
25
35
160
1)
250
/
25
35
160
1)
> 250
/
25
35
160
1)
1)
Recommended fuse.
Conductor cross-sections surge arresters with parallel connection
MCB/fuse
upstream
connected
Lq 1
Lq 2
Lq 3
Fuse F
[
A]
[
mm
2
]
[
mm
2
]
[
mm
2
]
[
A]
10
1.5
6
6
/
16
2.5
6
6
/
25
6
6
6
/
32
10
10
10
/
50
16
16
16
/
63
25
25
25
/
80
35
25
25
/
100
50
25
25
/
125
50
25
25
/
160
95
25
25
Up to 100
1)
200
120
25
25
Up to 125
> 250
> 120
25
25
Up to 125
1)
Due to selectivity to upstream protective device.
PAS
I2_10790a
L1
Lq1
Lq2
Lq3
MCB
S
P
D
F2
PAS
I2_10793a
L1
Lq2
Lq1
F2
Lq3
F1
© Siemens AG 2008