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BETA Protecting
Overvoltage Protection Devices
Surge arresters for
measuring and control technology
6/32
Siemens ET B1 · 10/2008
6
*
You can order this quantity or a multiple thereof.
■
Overview
The new surge arresters for measuring and control technology
are overvoltage protection modules, which comprise one basic
element and one male connector, i.e. two components. Their
application area is the protection of signal circuits.
The cable shields of basic elements can be either directly or
indirectly grounded.
The mounting width of the new surge arresters is 1 MW.
Through the number of integrated paths, it is possible to protect
up to four signal cores or two twin-wires against overvoltages.
■
Benefits
•
The two-component design offers users maximum maintenance
convenience. The basic element is always a fixed integral part
of the installation. No laborious interventions, e.g. in the case
of repair work
•
The benefits:
-
Two-component design, comprising one male connector
and one basic element
-
Interruption-free and impedance neutral plugging in and
pulling out of the male connector
-
Reverse polarity protection through mechanical encoding
-
Surge current carrying capable contacting to standard
mounting rail thanks to snap-on technique – no further
laborious wiring of the reference potential.
•
The arrangement of suppressor diodes between signal cores
achieves a fine protection in connection with a fast response.
The low capacitive coupling of the suppressor diodes to the
signal cores enables high data transmission rates
•
The use of gas-filled surge arresters ensures a high discharge
capacity.
■
Technical specifications
5
SD7 502-0 5SD7 520-1 5SD7 522-7 5SD7 530-3 5SD7 541-7 5SD7 550-4
IEC category/EN type
C1/C2/C3/D1 C1/C2/C3/D1/
B2
C1/C2/C3/D1 C1/C2/C3/D1 C1/C2/C3/D1 C1/C2/C3/D1
Max. continuous voltage U
C
•
DC voltage
V DC 68
185
40
5.2
40
14
•
AC voltage
V AC 48
130
28
3.6
28
9.8
Rated current
I
N
mA 2000
450
450
450
300
450
Lightning test current
I
imp
10/350
s Per path
kA 5
--
2.5
2.5
2.5
2.5
Rated discharge current
I
n
8/20
s
•
Core - Core
kA --
10
10
10
--
10
•
Core - Ground
kA 20
10
10
10
10
10
Total surge current
I
N
8/20
s
kA 40
10
20
20
20
20
Output voltage limit at 1 kV/ s
•
Core - Core
V
--
300
55
15
--
25
•
Core - Ground
V
600
300
450
15
55
25
Residual voltage at
I
n
•
Core - Core
V
--
160
(
C2/5 kA)
55
15
--
25
•
Core - Ground
V
--
160
(
C2/5 kA)
--
30
55
40
Response time t
A
•
Core - Core
ns
--
500
1
500
--
500
•
Core - Ground
ns
100
500
100
500
1
500
Insertion loss A
E
•
Symmetrical in the 50- system
dB --
--
Typ. 0.5
(1.5
MHz)
--
--
--
•
Asymmetrical in the 50- system
dB 0.1 (1 MHz)
--
--
--
0.5 (1.5
MHz) --
•
Symmetrical in the 100- system
dB --
Typ. 0.2
(5
MHz)
--
0.2 (5
MHz)
--
0.2 (5
MHz)
Limit frequency f
G
(3
dB)
•
Symmetrical in the 50- system
MHz --
--
Typ. 8
--
--
--
•
Asymmetrical in the 50- system
MHz --
--
--
--
Typ. 8
--
•
Symmetrical in the 100- system
MHz --
Typ. 70
--
Typ. 70
--
Typ. 70
Resistor per path
--
--
2.2
2.2
4.7
2.2
Temperature range
°C -40 ... +85
Degree of protection acc. to IEC 60529/EN 60529
IP20
Flammability category acc. to UL 94
V0
Test standards
EN 61643-21/
EN 61643-21
IEC 61643-21 EN 61643-21/
EN 61643-21
IEC 61643-21 EN 61643-21/
EN 61643-21
IEC 61643-21
© Siemens AG 2008