3EK7 Medium Voltage
Silicone Insulated Surge Arresters
www.siemens.com/energy/arrester
Answers for energy.
Setting Standards
The 3EK7 surge arrester from Siemens offers since 1999
superior protection against power surges for the equipment in electrical distribution systems with operating
voltages of up to 72.5 kV. Besides being highly resistant
to environmental pollution of all kinds, its performance
in dealing with earth faults and its e
­ xcellent short-circuit
ratings are setting entirely new standards. The silicone
on the 3EK7 surge arrester refuses to allow any deposits
of pollution or films of moisture to form on it. Thus,
­surface currents caused by pollution will virtually not
­occur. The 3EK7 arrester is also very lightweight,
­robust and ­durable, due to its special Cage Design™.
The 3EK7’s mechanical
features:
■■ Glass-collared MOV,
■■ Silicone rubber housing,
■■ FRP rods and
■■ Aluminium end fittings.
Three types of 3EK7 surge
arresters are available:
3EK7…-. C .. surge arresters
according to IEC 60099-4
with metric thread,
3EK7...-. A .. surge arresters
according to IEEE Std C 62.11
with imperial thread.
For special applications:
3EK7...-. B .. surge arresters
according to IEEE Std C 62.11
with metric thread.
2
3EK7 Design
i­nternal pressure, since the resistors are not enclosed
in a sealed mechanical shell. Thus, the arc can ­escape
through the silicone sheath, leaving the mechanical
support structure of the enclosure unharmed.
3EK7 a top quality product
■■
■■
The silicone rubber housing is molded directly onto
the MOV blocks and the protection cage. It provides
an excellent sealing system against moisture ingress
and partial discharges. In addition, the MOV blocks
are glass-collared to prevent aging.
Highest quality materials. Silicone rubber is highly
­hydrophobic and maintains this ability to repel water
and any deposits of ­pollution throughout its entire
­service life. This results in high tracking and erosion
­resistance. Furthermore, the silicone rubber housing
is self-extinguishing and flame-retardant. These advantages ­provide maintenance free and reliable service
life for 3EK7 arresters.
■■
The cage is lightweight design and yet it offers excellent torsional, tensile and cantilever strength: Maximum
working cantilever strength of 350 Nm.
■■
Silicone rubber is resistant to UV and ozone exposure as
well as to all common organic and non-organic solvents
and cleaning agents. Therefore, the 3EK7 is suitable for
any environmental conditions of ­industrial areas as well
as in desert or coastal regions.
■■
3EK7 arresters are suitable for a temperature range
from –55° C to +60° C.
Application altitude up to 3600 m a.s.l.
■■
Manufacturing plants are certified ­under ISO 9001
and ISO 14001.
■■
■■
3EK7 arresters have been type tested by an independent test laboratory.
Fast delivery
■■
Secure and reliable design
■■
Flexibility in production and in our ­global network
of service and sales ­facilities provide fast and prompt
­supply.
The 3EK7 series is based on a cage of pre-stressed fiberreinforced plastic rods for high mechanical strength,
­reducing the risk of internal components being ejected.
In the extremely rare event of the resistors being overloaded, arcing cannot result in a build-up of critical
M12 or 3/8 inch stainless steel stud
Nut, washer
Clamp
End fitting
Silicone housing,
directly molded
Metal oxide varistor MOV
Glass coating
FRP rods
End fitting
Nut, washer
M12 or 3/8 inch stainless steel stud
3
Selection and Main Data
3EK7 Arresters According to IEC 60099-4
Voltage per unit Ur
1.2
Preheating to 60°C and stressed with
one high current impulse prior to TOV
1.15
1.1
1.05
Nominal discharge
current In
10 kA
Maximum continuous
operating voltage Uc
48 kV
Rated voltage Ur
60 kV
Long-duration
current impulse
1.0
325 A
Rated short-circuit current
20 kA
Low short-circuit current
600 A
High-current impulse
100 kA
Specified long-term load
SLL (Fstat)
350 Nm
Specified short-term load
SSL (Fdyn)
500 Nm
Energy absorption
capability (thermal)
3.5 kJ/kV Ur
0.95
0.9
0.85
Time in
seconds
0.8
0.1
1
10
100
1000
Table 1: IEC power-frequency voltage versus time characteristic
Rated
voltage
Continuous
­operating
­voltage
Ur
[kV]
Uc
[kV]
Arrester type
Maximum values of the residual voltages
at discharge currents of the following impulses
Creepage
distance
8/20 µs
1 kA
[kV]
8/20 µs
3 kA
[kV]
8/20 µs
5 kA
[kV]
8/20 µs
10 kA
[kV]
8/20 µs
20 kA
[kV]
30/60 µs
125 A
[kV]
30/60 µs
500 A
[kV]
[mm]
3
2.4
3EK7 030 - 4 C B 4
6.5
7.1
7.4
8.0
9.1
5.8
6.1
372
5
4.0
3EK7 050 - 4 C B 4
10.9
11.8
12.3
13.3
15.2
9.7
10.2
372
6
4.8
3EK7 060 - 4 C B 4
13.0
14.2
14.8
15.9
18.3
11.6
12.2
372
9
7.2
3EK7 090 - 4 C B 4
19.6
21.2
22.2
23.9
27.4
17.4
18.4
372
12
9.6
3EK7 120 - 4 C C 4
26.1
28.3
29.6
31.8
36.6
23.2
24.5
485
15
12.0
3EK7 150 - 4 C C 4
32.6
35.4
37.0
39.8
45.7
29.0
30.6
485
18
14.4
3EK7 180 - 4 C D 4
39.1
42.5
44.4
47.7
54.9
34.8
36.7
605
21
16.8
3EK7 210 - 4 C D 4
45.6
49.5
51.8
55.7
64.0
40.6
42.9
605
24
19.2
3EK7 240 - 4 C E 4
52.2
56.6
59.1
63.6
73.1
46.4
49.0
775
27
21.6
3EK7 270 - 4 C E 4
58.7
63.7
66.5
71.6
82.3
52.2
55.1
775
30
24.0
3EK7 300 - 4 C F 4
65.2
70.8
73.9
79.5
91.4
58.0
61.2
900
33
26.4
3EK7 330 - 4 C H 4
71.7
77.8
81.3
87.5
101
63.8
67.3
1230
36
28.8
3EK7 360 - 4 C H 4
78.2
84.9
88.7
95.4
39
31.2
3EK7 390 - 4 C H 4
84.7
92.0
96.1
42
33.6
3EK7 420 - 4 C H 4
91.3
99.1
45
36.0
3EK7 450 - 4 C H 4
97.8
48
38.4
3EK7 480 - 4 C H 4
51
40.8
54
110
69.6
73.5
1230
103
119
75.4
79.6
1230
104
111
128
81.2
85.7
1230
106
111
119
137
87.1
91.8
1230
104
113
118
127
146
92.9
97.9
1230
3EK7 510 - 4 C J 4
111
120
126
135
155
98.7
43.2
3EK7 540 - 4 C J 4
117
127
133
143
165
57
45.6
3EK7 570 - 4 C J 4
124
134
140
151
60
48.0
3EK7 600 - 4 C J 4
130
142
148
60
48.0
3EK7 600 - 4 C K 4
130
142
148
Table 4: 3EK7 nominal discharge current 10 kA
4
Table 2: 3EK7 arrester main data
104
1420
104
110
1420
174
110
116
1420
159
183
116
122
1420
159
183
116
122
1595
Highest voltage
for equipment
Um
Rated lightning
impulse withstand
voltage
[kV]
[kV]
2.75
3.6
5.5
7.2
8.25
12
15.5
17.5
24
25
27
30
36
38
40.5
48.3
52
72.5
30; 45; 60
20; 40
45; 60; 75
40; 60
60; 75; 95
60; 75; 95
85; 110
95
125; 145
125; 145
150
160
170
200
190
250
250
325
Solidly earthed
neutral system
Isolated ­
neutral system
Impedance earthed
neutral system
Resonant earthed
neutral system
3EK7 030-.C..
3EK7 030-.C..
3EK7 050-.C..
3EK7 060-.C..
3EK7 090-.C..
3EK7 090-.C..
3EK7 120-.C..
3EK7 150-.C..
3EK7 180-.C..
3EK7 210-.C..
3EK7 210-.C..
3EK7 240-.C..
3EK7 270-.C..
3EK7 300-.C..
3EK7 330-.C..
3EK7 390-.C..
3EK7 420-.C..
3EK7 570-.C..
3EK7 050-.C..
3EK7 050-.C..
3EK7 090-.C..
3EK7 090-.C..
3EK7 105-.C..
3EK7 150-.C..
3EK7 210-.C..
3EK7 220-.C..
3EK7 300-.C..
3EK7 330-.C..
3EK7 360-.C..
3EK7 390-.C..
3EK7 450-.C..
3EK7 480-.C..
3EK7 510-.C..
3EK7 600-.C..
–
–
3EK7 030-.C..
3EK7 030-.C..
3EK7 050-.C..
3EK7 090-.C..
3EK7 090-.C..
3EK7 105-.C..
3EK7 150-.C..
3EK7 150-.C..
3EK7 210-.C..
3EK7 220-.C..
3EK7 240-.C..
3EK7 270-.C..
3EK7 330-.C..
3EK7 330-.C..
3EK7 360-.C..
3EK7 420-.C..
3EK7 450-.C..
–
3EK7 050-.C..
3EK7 050-.C..
3EK7 090-.C..
3EK7 090-.C..
3EK7 105-.C..
3EK7 150-.C..
3EK7 210-.C..
3EK7 220-.C..
3EK7 300-.C..
3EK7 330-.C..
3EK7 360-.C..
3EK7 390-.C..
3EK7 450-.C..
3EK7 480-.C..
3EK7 510-.C..
3EK7 600-.C..
–
–
Table 3: Typical 3EK7 arresters for system voltages according to IEC 60099-4
Flashover
distance
Specified
Specified
­long-term
short-term
load SSL (Fdyn) load SLL (Fstat)
Housing
insulation
Height
“H” 1)
Weight
[mm]
Lightning impulse
withstand voltage
1.2/50 µs
[kV]
Power frequency
withstand voltage
1 min., wet
[kV]
[N]
[N]
[mm]
[kg]
180
104
49
2940
2050
170
1.5
180
104
49
2940
2050
170
1.5
180
104
49
2940
2050
170
1.6
180
104
49
2940
2050
170
1.6
210
122
57
2500
1750
200
1.9
210
122
57
2500
1750
200
2.0
248
144
67
2080
1450
240
2.3
248
144
67
2080
1450
240
2.4
286
166
77
1850
1290
270
2.7
286
166
77
1850
1290
270
2.8
318
184
86
1660
1160
300
3.1
418
242
113
1250
870
400
3.9
418
242
113
1250
870
400
4.0
418
242
113
1250
870
400
4.1
418
242
113
1250
870
400
4.1
418
242
113
1250
870
400
4.2
418
242
113
1250
870
400
4.3
484
281
131
1060
740
470
4.9
484
281
131
1060
740
470
5.0
484
281
131
1060
740
470
5.0
484
281
131
1060
740
470
5.1
520
302
140
980
680
510
5.3
1) Refer to figure 1 on page 8
5
Selection and Main Data
3EK7 Arresters According to IEEE Std C 62.11
Voltage per unit MCOV
Heavy duty
1.8
Riser pole
Maximum continuous
­operating voltage
29kV
MCOV
29kV
Duty-cycle voltage
36kV
36kV
Short-circuit current
0.2 s
20kA
20kA
1.5
Low-current,
long-duration
250A
250A
1.4
Low-current
pressure relief
600A
600A
High-current,
short-duration
100kA
100kA
Lightning impulse
classifying current
10kA
10kA
Energy absorption
­capability (thermal)
4.6kJ/kVMCOV 4.6kJ/kVMCOV
Maximum design
­cantilever load-static
(MDCL)
2478 inch-lbf 2478 inch-lbf
Preheating to 140°F/60°C
no prior duty
■ heavy duty
■ riser pole
1.7
1.6
1.3
1.2
1.1
1.0
0.01
Time in
seconds
0.1
1
10
100
1000
10000
Table 5: ANSI temporary overvoltage
Table 6: 3EK7 distribution arrester main data
3EK7 heavy duty
Duty-cycle
voltage
MCOV
TOV Capability
w/o duty
[kV]
[kV]
for 0.1s
[kV]
3
6
9
10
12
15
18
21
24
27
30
33
36
2.55
5.10
7.65
8.40
10.2
12.7
15.3
17.0
19.5
22.0
24.4
27.5
29.0
4.3
8.5
12.8
14.0
17.0
21.2
25.6
28.4
32.6
36.7
40.7
45.9
48.4
MCOV
TOV Capability
w/o duty
Arrester part number
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
030
060
090
100
120
150
180
210
240
270
300
330
360
-
3AB
3AB
3AB
3AB
3AC
3AD
3AD
3AE
3AF
3AF
3AH
3AH
3AH
4
4
4
4
4
4
4
4
4
4
4
4
4
Protective Level Maximum discharge voltage
FOW
[kV] cr
8/20 µs
1.5 kA
[kV] cr
8/20 µs
3 kA
[kV] cr
8/20 µs
5 kA
[kV] cr
8/20 µs
10 kA
[kV] cr
8/20 µs
20 kA
[kV] cr
8/20 µs
40 kA
[kV] cr
45/90 µs
125 A
[kV] cr
10.5
21.6
30.9
32.3
41.0
51.3
61.5
67.3
77.6
87.7
96.6
108
119
8.1
16.7
23.9
25.0
31.7
39.6
47.5
52.0
59.9
67.7
74.6
83.6
92
8.5
17.4
25.0
26.2
33.2
41.5
49.8
54.5
62.7
70.9
78.1
87.6
96
8.8
18.2
26.1
27.3
34.7
43.3
52.0
56.9
65.6
74.1
81.7
91.5
100
9.5
19.6
28.1
29.4
37.3
46.6
55.9
61.2
70.5
79.7
87.8
98.4
108
10.9
22.5
32.3
33.8
42.9
53.6
64.3
70.4
81.1
91.7
101
113
124
12.6
26.1
37.4
39.1
49.6
62.0
74.3
81.4
93.8
106
117
131
144
6.9
14.3
20.5
21.5
27.2
34.0
40.8
44.7
51.5
58.2
64.1
71.8
78.8
3EK7 riser pole
Duty-cycle
voltage
6
[kV]
[kV]
for 0.1s
[kV]
3
6
9
10
12
15
18
21
24
27
30
33
36
2.55
5.10
7.65
8.40
10.2
12.7
15.3
17.0
19.5
22.0
24.4
27.5
29.0
3.8
7.6
11.4
12.5
15.1
18.9
22.7
25.2
29.0
32.7
36.2
40.8
43.1
Arrester part number
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
3EK7
030
060
090
100
120
150
180
210
240
270
300
330
360
-
4AB
4AB
4AB
4AC
4AD
4AD
4AE
4AF
4AH
4AH
4AH
4A J
4AK
4
4
4
4
4
4
4
4
4
4
4
4
4
Protective Level Maximum discharge voltage
FOW
[kV] cr
8/20 µs
1.5 kA
[kV] cr
8/20 µs
3 kA
[kV] cr
8/20 µs
5 kA
[kV] cr
8/20 µs
10 kA
[kV] cr
8/20 µs
20 kA
[kV] cr
8/20 µs
40 kA
[kV] cr
45/90 µs
125 A
[kV] cr
8.9
17.7
26.4
29.3
35.2
43.9
52.7
61.5
70.2
79.1
87.7
96.6
105
6.8
13.6
20.3
22.6
27.1
33.9
40.7
47.4
54.2
61.0
67.8
74.6
81.3
7.1
14.2
21.3
23.7
28.4
35.5
42.6
49.7
56.8
63.9
71.0
78.1
85.2
7.4
14.8
22.2
24.7
29.7
37.1
44.5
51.9
59.3
66.7
74.2
81.6
89.0
8.0
15.9
23.9
26.6
31.9
39.9
47.8
55.8
63.8
71.8
79.7
87.7
95.7
9.2
18.3
27.5
30.6
36.7
45.9
55.0
64.2
73.4
82.5
91.7
101
110
10.6
21.2
31.8
35.4
42.4
53.0
63.6
74.2
84.8
95.4
106
117
127
5.8
11.6
17.5
19.4
23.3
29.1
34.9
40.7
46.6
52.4
58.2
64.0
69.9
System L-L Voltage
[kV]
Four-wire multigrounded
neutral wye
Three-wire low impedance
grounded neutral circuit
3EK7 030-.A..
3EK7 060-.A..
2.4
Three-wire high impedance
grounded neutral circuit
3EK7 030-.A..
4.16
3EK7 060-.A..
4.26
3EK7 060-.A..
4.8
3EK7 060-.A..
6.9
3EK7 090-.A..
8.3
3EK7 060-.A..
3EK7 090-.A..
12
3EK7 120-.A..
20.78
3EK7 090-.A..
3EK7 090-.A..
or
3EK7 100-.A..
3EK7 100-.A..
3EK7 100-.A..
or
3EK7 120-.A..
3EK7 150-.A..
22.86
3EK7 150-.A..
3EK7 210-.A..
24.94
3EK7 180-.A..
3EK7 270-.A..
27.6
3EK7 210-.A..
3EK7 300-.A..
34.5
3EK7 270-.A..
3EK7 360-.A..
12.47
13.2
13.8
3EK7 150-.A..
3EK7 150-.A..
3EK7 150-.A..
3EK7 180-.A..
3EK7 210-.A..
23
3EK7 300-.A..
Table 7: Typical 3EK7 arresters for system voltages according to the latest IEEE Std C 62.11
Creepage
distance
Flashover
distance
Power frequency withstand voltage 1 min., wet
Lightning impulse withstand voltage 1.2/50 µs
Height
“H” 1)
Weight
45/90 µs
500 A
[kV] cr
[inch]
[inch]
[kV]
[kV]
[inch]
[lbs]
7.3
15.1
21.6
22.6
28.7
35.9
43.0
47.1
54.3
61.4
67.6
75.8
83.2
14.65
14.65
14.65
14.65
19.09
23.82
23.82
30.51
35.43
35.43
48.43
48.43
48.43
7.09
7.09
7.09
7.09
8.27
9.76
9.76
11.26
12.52
12.52
16.46
16.46
16.46
49
49
49
49
57
67
67
77
86
86
113
113
113
104
104
104
104
122
144
144
166
184
184
242
242
242
6.69
6.69
6.69
6.69
7.87
9.45
9.45
10.63
11.81
11.81
15.75
15.75
15.75
2.8
3.2
3.2
3.5
4.1
5.1
5.4
6.1
6.7
7.0
8.2
8.5
8.9
Creepage
distance
Flashover
distance
Power frequency withstand ­voltage 1 min., wet
Lightning impulse withstand voltage 1.2/50 µs
Height
“H” 1)
Weight
45/90 µs
500 A
[kV] cr
[inch]
[inch]
[kV]
[kV]
[inch]
[lbs]
6.1
12.3
18.4
20.5
24.6
30.7
36.8
43.0
49.1
55.3
61.4
67.5
73.7
14.65
14.65
14.65
19.09
23.82
23.82
30.51
35.43
48.43
48.43
48.43
55.91
62.80
7.09
7.09
7.09
8.27
9.76
9.76
11.26
12.52
16.46
16.46
16.46
19.06
20.47
49
49
49
57
67
67
77
86
113
113
113
131
140
104
104
104
122
144
144
166
184
242
242
242
281
302
6.69
6.69
6.69
7.87
9.45
9.45
10.63
11.81
15.75
15.75
15.75
18.50
20.08
2.8
3.2
3.5
3.5
4.1
4.4
5.1
5.4
6.1
6.7
7.0
8.2
8.5
1) Refer to figure 1 on page 8
Table 8: 3EK7 heavy duty
Table 9: 3EK7 riser pole
7
74
18.2
14.2
38.5
Ø1
36
M12
31.5
64
Drawings and Accessories
41
94
104
2.5
Ø
20
14
108
154
14.2
18.2
74
64
31.5
H*
Figure 2: NEMA insulating bracket for Ur ≤ 15 kV
Order code P12; 0.35 kg
Ø1
38.5
41
36
104
94
2.5
Ø
M12
14
20
152
198
14.5
17 26
60
54
54
60
12
17 26
12
15
Figure 4: DIN insulating bracket for Ur ≤ 15 kV
Order code P22; 0.85 kg
8
8
104
15
104
156
197
8
14.5
Figure 3: NEMA insulating bracket for Ur ≤ 36 kV
Order code P12; 0.5 kg
Figure 1: 3EK7 surge arrester main dimensions
* please see tables on page 5 or 7
200
241
Figure 5: DIN insulating bracket for Ur ≤ 36 kV
Order code P22; 1.0 kg
SW14
(width across flats 9/16")
(214)
(173)
24.5
(60)
57
5
Ø 75
260
21.5
(17)
(26)
Ø1
(15)
M12 or 3/8"
Figure 7: Bird protection cap
Order code M81; 50 g
12
16
30
Ø 13
60
26
8
14.5
Figure 6: Disconnector
Order code P31; 0.1 kg
15
75
197
Ø 13
Ø 14
20
30
13
40
33
260
152
M12
Figure 9: DIN metal bracket (hot dip galvanised)
Order code P21; 0.6 kg
ø14
3
30
(15)
(87)
200
24
30
60
Figure 8: L-bracket
Order code M12; 0.1 kg
Ø ø200
ø10,2
Ø 14 or 10.2
260
Ø 14
260
25
25
50
50
Ø
13
13
Ø
450
(10)
152
152
202
20
202
Figure 11: NEMA metal bracket (hot dip galvanized)
Order code P11; 0.6 kg
Figure 10: Insulated ground lead/Insulated line lead
Order code R51; 0.09 kg, 16 mm2
269
178
Figure 12: Transformer bracket 8.7"
Order code Q11; 0.6 kg
18
78
78,5
25
260
43
Figure 13: Transformer bracket 11"
Order code Q12; 0.7 kg
24
3
43
30
60
20
M12
40
20
64
57
200
43
40
20
20
42,9
43
41
25
14,3
14.3
57
20
20
(63,5)
64
(57,2)
14.3
(41,4)
41
25,4
78
18
18
(8)
14
14
145 144,8
14
280 (11")
221 (8.7")
Ø ø200
260
9
Drawings and Accessories
310 (12.25")
18
14
86
64
86
54
20
43
30
60
55
40
40
3
200
19
43
55
Ø ø200
260
Figure 14: Transformer bracket 12.25"
Order code Q13; 0.8 kg
Figure 15: Transformer bracket 14.5"
Order code Q14; 0.8 kg
Ø
227
12
3 x
15.2
198
Ø 18
28
71
18
10.5…150
142
0°
M12
20
14
0
66
ø41
220
20
4
0…120
25
Ø
73
253.5
M12
Figure 16: NEMA X-arm bracket
Order code Q51; 1.3 kg
Figure 17: Mounting plate, 37 mm height
Order code Q81; 1.6 kg
M11
M13
86
8 …18
(8)
Ø1
ø41
(8)
2.5
25,4
78,5
cable Ø 8 … Ø 14
45
260
78,5
8 …18
28
cable Ø 14 … Ø 18
24
30
(15)
(87)
3
200
25,4
92
30
60
M12
4
20
M12
Ø ø200
M12
Figure 18: Line clamp
Order code M11 or M13; 0.1 kg
10
Figure 19: Stainless steel capØ ø200
260
Order code M71; 5 g
24
3
30
(15)
(87)
200
30
60
M12
260
260
260
M12
24
260
14.3
69
30
(15)
(87)
46
40
25
63
57
40
14.3
41
76
35
18
368 (14.5")
327
78
14
178
Order information
Outline drawings for common design
­options are shown in figure 20, 21 and 22
Part number
3 E K 7 300
Medium voltage surge arrester
3 E K 7
Rated voltage in kV x 10
–
4
C
F
4
– Z R51 M81 P12 P31
300
–
–
Classification
Distribution class, heavy duty (IEEE)
3
Nominal discharge current In = 10 kA (IEC)
or distribution class, riser pole (IEEE)
4
Standard
IEEE Std C 62.11 with imperial-thread terminals
A
IEEE Std C 62.11 with metric-thread terminals
B
IEC - 60099-4 with metric-thread terminals
C
Housing size, creepage distance
Figure 20: 3EK7 surge arrester with
accessories P12 and P31
170 mm
B
200 mm
C
240 mm
D
270 mm
E
300 mm
F
400 mm
H
470 mm
J
510 mm
K
Form of sheds
Alternating sheds
4
Accessories*
Z
High-voltage terminal equipped with
Line clamp M11
M11
L-bracket
M12
Line clamp M13
M13
Line lead, insulated, 455 mm/18 inch, 16 mm2
Stainless steel cap
R51
M71
Bird protection cap
M81
Earth terminal equipped with
NEMA metal bracket (hot dip galvanized steel)
Figure 21: 3EK7 surge arrester with
accessories P12, P31 and Q51
P11
NEMA insulating bracket
P12
DIN metal bracket (hot dip galvanized steel)
P21
DIN insulating bracket
P22
Disconnector
P31
Ground strap, 245 mm
P52
Ground lead, insulated, 455 mm/18 inch, 16 mm2
R51
Mounting auxiliaries
Transformer bracket (8.7 inch)
Q11
Transformer bracket (11 inch)
Q12
Transformer bracket (12.25 inch)
Q13
Transformer bracket (14.5 inch)
Q14
X-arm bracket
Q51
Mounting plate for 200 mm and 10 inch bolt circle
Q81
*Other additional parts on request, not all combinations are possible
Standard accessories at
■■
Figure 22: 3EK7 surge arrester
with accessories P12, P31, P52 and Q11
■■
high-voltage terminal: M12 or 3/8 inch stud, standard clamp,
washer and nut
earthing terminal: M12 or 3/8 inch stud, washer and nut
11
Published by and copyright © 2011:
Siemens AG
Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
Siemens AG
Energy Sector
Power Transmission Division
High Voltage Products
Nonnendammallee 104
13629 Berlin, Germany
www.siemens.com/energy/arrester
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-A110-V2-4A00 | Printed in Germany |
Dispo 30002 | c4bs No. 7457 |
TH 263-110140 | WÜ | 472573 | WS | 11111.0
Printed on elementary chlorine-free bleached paper.
All rights reserved.
Trademarks mentioned in this document
are the property of Siemens AG, its affiliates,
or their respective owners.
Subject to change without prior notice.
The information in this document contains general
descriptions of the technical options available, which
may not apply in all cases. The required technical
options should therefore be specified in the contract.