3EK7 Medium Voltage Surge Arresters
with Line Discharge Class 2
www.siemens.com/energy/arrester
Siemens cage design 3EK surge arresters for medium
voltage are now also available with LD-class 2. The 3EK7
with LD-class 2 is the first choice for protection against
power surges in any medium voltage distribution system
from 3 kV to 60 kV.
and therefore prevent ejection of parts in the event of
overload. At the same time, the electric arc can escape
directly via the flexible silicone housing which is vulcanized directly onto the active part. This means that high
pressure can not build up in the case of overloading.
The LD-class 2 will be achieved by special metal oxide
varistors with a significant high long duration current
impulse capability (550 A/2 ms). The innovative cage
design ensures outstanding performance in safety issues.
Fiberglass-reinforced plastic rods provide high mechanical
strength and optimized performance-to-weight ratio.
They enclose the metal oxide blocks firmly and securely
The silicone housing is highly resistant to environmental
pollution of all kinds, so the 3EK7 with LD-class 2 is
perfectly suited for all environments. Silicone is dirt- and
water-repellent and the direct-molding-technology
reliably prevents the penetration of moisture. The arrester
retains its outstanding properties over the entire long
service life of the arrester.
p.u. Ur
Selected accessories
1.3
1.25
1.2
Ø 8… Ø 18
1.15
Ø 8… Ø 18
92
86
1.1
cable Ø 14 … Ø 18
1.05
1
0.95
0.9
t /s
cable Ø 8 … Ø 14
Line clamp M11
Line clamp M13
0.1
1
10
100
1000
Preheating to 60°C and stressed with energy acc. to line
discharge class 2 prior to TOV
Answers for energy.
Rated
voltage
Contin- Maximum values of the residual voltages at discharge
uous
curr­­­ents of the following impulses
operating
voltage
Ur
kV
Uc
kV
Arrester
type
Number
of
units
Housing
insulation
8/20 µs 8/20 µs 8/20 µs 8/20 µs 8/20 µs 30/60 µs 30/60 µs
1 kA
3 kA
5 kA
10 kA 20 kA 125 A
500 A
kV
kV
kV
kV
kV
kV
kV
Creepage
LightPower disning
frequen- tance
impulse cy withwithstand
stand
voltage
voltage 1min.,
1.2/50 µs wet
Flashover
distance
Specified
shortterm
load
SSL
(Fdyn)
Specified Height Weight
long-term [H]
load SLL
(Fstat)
kV
mm
N
N
kV
mm
mm
kg
3
2.4
7.0
7.6
8.0
8.6
9.8
6.2
6.6
3EK7030-5CB4
1
104
49
372
180
2940
2050
170
1.5
6
4.8
14.0
15.2
15.9
17.1
19.7
12.5
13.2
3EK7060-5CB4
1
104
49
372
180
2940
2050
170
1.6
9
7.2
21.0
22.8
23.9
25.7
29.5
18.7
19.8
3EK7090-5CC4
1
122
57
485
210
2500
1750
200
1.9
12
9.6
28.0
30.4
31.8
34.2
39.3
25.0
26.3
3EK7120-5CD4
1
144
67
605
248
2080
1450
240
2.3
15
12.0
35.1
38.0
39.8
42.8
49.2
31.2
32.9
3EK7150-5CD4
1
144
67
605
248
2080
1450
240
2.4
18
14.4
42.1
45.7
47.7
51.3
59.0
37.4
39.5
3EK7180-5CE4
1
166
77
775
286
1850
1290
270
2.8
21
16.8
49.1
53.3
55.7
59.9
68.8
43.7
46.1
3EK7210-5CF4
1
184
86
900
318
1660
1160
300
3.2
24
19.2
56.1
60.9
63.6
68.4
78.7
49.9
52.7
3EK7240-5CH4
1
242
113
1230
418
1250
870
400
4.0
27
21.6
63.1
68.5
71.6
77.0
88.5
56.2
59.3
3EK7270-5CH4
1
242
113
1230
418
1250
870
400
4.1
30
24.0
70.1
76.1
79.5
85.5
98.3
62.4
65.8
3EK7300-5CH4
1
242
113
1230
418
1250
870
400
4.2
33
26.4
77.1
83.7
87.5
94.1
108
68.7
72.4
3EK7330-5CJ4
1
281
131
1420
484
1060
740
470
4.9
36
28.8
84.1
91.3
95.4
103
118
74.9
79.0
3EK7360-5CJ4
1
281
131
1420
484
1060
740
470
5.0
39
31.2
91.1
98.9
103
111
128
81.1
85.6
3EK7390-5CJ4
1
281
131
1420
484
1060
740
470
5.1
42
33.6
98.2
107
111
120
138
87.4
92.2
3EK7420-5CK4
1
302
140
1595
520
980
680
510
5.4
45
36.0
105
114
119
128
147
93.6
98.8
3EK7450-5CP4
2
484
226
2460
836
570
400
840
7.3
48
38.4
112
122
127
137
157
99.9
105
3EK7480-5CP4
2
484
226
2460
836
570
400
840
7.5
51
40.8
119
129
135
145
167
106
112
3EK7510-5CP4
2
484
226
2460
836
570
400
840
7.7
54
43.2
126
137
143
154
177
112
119
3EK7540-5CP4
2
484
226
2460
836
570
400
840
7.9
57
45.6
133
145
151
162
187
119
125
3EK7570-5CP4
2
484
226
2460
836
570
400
840
8.1
60
48.0
140
152
159
171
197
125
132
3EK7600-5CP4
2
484
226
2460
836
570
400
840
8.3
Ø
SW14
14
142
227
21.5
3x
12
3 x 12
0°
0°
0
4
20
25
Ø
(width across flats 9/16“)
253.5
M12 or 3/8“
Disconnector
Mounting plate
Published by and copyright © 2011:
Siemens AG
Energy Sector
Freyeslebenstrasse 1,
91058 Erlangen, Germany
74
ø1
38.5
104
94
41
2.5
2.5
ø
20 14
ø
108
154
mm
NEMA insulating bracket for U r ≤ 15 kV
41
ø1
38.5
104
94
14.2
18.2
64
31.5
64
31.5
14.2
18.2
74
253.5
20
mm
152
198
NEMA insulating bracket for U r ≤ 36 kV
14
Siemens AG
Power Transmission Division
High Voltage Products
Nonnendammallee 104,
13629 Berlin, Germany
Please contact us at:
Phone:+49 30 386 33 222
Fax: +49 30 386 26 721
E-mail: arrester.energy@siemens.com
Power Transmission Division
Order No. E50001-G630-A209-X-4A00
Printed in Germany
Dispo 30002, c4bs No. 7457
fb 4359 WÜ 11111.0
www.siemens.com/energy/arrester