3EK7 Distribution Class
Surge Arresters
Answers for energy.
Siemens at Your Service
As a global leader of the electronics
industries, Siemens has been active
in the fields of power transmission
and distribution for over 125 years –
since Werner von Siemens discovered
the dynamo-electric principle in 1866.
This early involvement led to a vast
range of products for medium and
high voltage applications.
Global player with a strong U.S. background
Since 1886, Siemens has been serving customers in the United States
through dedicated sales and production facilities. Today, Siemens of North
America has a workforce of over 70,000 people, who in 2005 reached a turnover of approx. 18.8 billion US$. Our customers rely on our Global Network
of Innovation and our ability to deliver perfect solutions and services for any
task, from single components to turnkey systems.
The better choice:
Distribution class surge arresters from Siemens
The 3EK7 series of surge arresters is part of our initiative to supply the
American market with no less than
a top quality product
with outstanding technical features and
very fast delivery.
As a leading company in the field of silicone rubber (SR) insulation and one
of the few suppliers with comprehensive in-house research and development
capabilities, we have developed the 3EK7 surge arrester series to offer superior
protection against power surges for equipment in electrical distribution
systems with operating voltages of up to 34.5 kV. 3EK7 surge arresters have
been tested per the latest IEEE standards by an independent test laboratory.
Their performance in dealing with ground faults and their excellent shortcircuit ratings are setting completely new standards in medium voltage
applications.
2
3EK7 a top quality product
The SR housing is molded directly onto
the MOV blocks and the supporting
cage structure. 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. SR 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 SR housing
is self-extinguishing and flame-retardant.
These advantages provide maintenance
free and reliable service life for 3EK7
arresters.
Manufacturing plants are certified
under ISO 9001 and ISO 14001.
3EK7 arresters have been type tested
by independent test laboratories.
3EK7 Design
38
/
inch stainless steel stud
Nut, washer
Clamp
End fitting
Silicone housing,
directly molded over
MOV, fiber-glass rods
and end fittings
Metal oxide varistor MOV
Glass coating
Fiber-glass rods
End fitting
Nut, washer
3/8
Secure and reliable design
The 3EK7 series is based on a cage of
pre-stressed fiber-glass rods for high
mechanical strength. In the extremely
rare event of the resistors being overloaded, arcing cannot result in a buildup of critical 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, reducing
the risk of internal components being
ejected.
The cage is lightweight design and yet
it offers excellent torsional, tensile and
cantilever strength: Maximum working
cantilever strength of 2400 in-lbf.
SR 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 condition of
industrial areas as well as for desert
or coastal regions.
Temperature range – 55 °C to + 50 °C
Application altitude up to 12,000 ft.
inch stainless steel stud
Horizontal cross section view
of surge arrester
Fast delivery
Flexibility in production and in our global
network of service and sales facilities
provide fast and prompt supply e.g.
shipment ex stocks within six days after
your order has been received for the
surge arresters marked with asterisk (*)
(Refer to table on page 4).
3
3EK7 Main Data
and Selection
Normal duty
Heavy duty/Riser pole
Maximum continuous
operating voltage MCOV
29 kV
Duty cycle voltage
36 kV
High current pressure relief
20 kA
Maximum design
cantilever load-static (MDCL)
Electrical and
Mechanical Data
Duty cycle
[kV]
2400 inch-lbf
MCOV
Arrester part number
FOW
0.5 µs, 5 kA
[kV]
[kV]
3 kA
8/20 µs
[kV]
3
2.55
3EK7 030 -2AB4
10.0
8.2
8.6
6
5.1
3EK7 060 -2AB4
20.0
16.3
17.3
Coordinating current
5 kA
10 kA
9*
Low-current, long-duration
75 A
250 A
10*
7.65
3EK7 090 -2AB4
30.0
24.5
25.9
8.4
3EK7 100 -2AB4
33.3
27.2
28.8
High-current, short-duration
65 kA
100 kA
12
10.2
3EK7 120 -2AC4
38.8
31.7
33.5
Energy absoption capability
2.7 kJ/kV MCOV
4.6 kJ/kV MCOV
15
12.7
3EK7 150 -2AC4
48.4
39.6
41.8
18*
15.3
3EK7 180 -2AD4
57.2
46.8
49.4
21
17
3EK7 210 -2AD4
66.8
54.6
57.7
Table 1: 3EK7 distribution arrester main data
System L-L
voltage
[kV]
Four-wire
multigrounded
neutral wye
Three-wire low
impedance grounded
neutral circuit
4.16
3EK7 030…
24
19.5
3EK7 240 -2AE4
73.9
60.4
63.8
27*
22
3EK7 270 -2AF4
83.1
68.0
71.8
30
24.4
3EK7 300 -2AF4
92.3
75.6
79.7
3EK7 030…
33
27.5
3EK7 330 -2AH4
102
83.1
87.7
3EK7 060…
36
29
3EK7 360 -2AH4
111
90.7
95.7
FOW
0.5 µs,10 kA
[kV]
1.5 kA
8/20 µs
[kV]
3 kA
8/20 µs
[kV]
Three-wire high
impedance grounded
neutral circuit
2.4
3EK7 060…
4.26
3EK7 060…
4.8
3EK7 060…
6.9
8.3
12
Table 4: 3EK7 normal duty
3EK7 090…
3EK7 060…
3EK7 090…
3EK7 090…
3EK7 120…
[kV]
[kV]
3*
2.55
3EK7 030 -3AB4
10.5
8.0
8.4
6*
5.1
3EK7 060 -3AB4
21.6
16.5
17.2
12.47
3EK7 090…
or
3EK7 100…
3EK7 150…
13.2
3EK7 100…
3EK7 150…
13.8
3EK7 100…
or
3EK7 120...
3EK7 150…
20.78
3EK7 150…
22.86
3EK7 150…
24
24.94
3EK7 180…
3EK7 270…
27*
27.6
3EK7 210…
3EK7 300…
30*
34.5
3EK7 270…
3EK7 360…
9*
10*
7.65
3EK7 090 -3AB4
30.9
23.6
24.7
8.4
3EK7 100 -3AB4
32.3
24.7
25.9
12
10.2
3EK7 120 -3AC4
41.0
31.3
32.8
15*
12.7
3EK7 150 -3AD4
51.3
39.1
41.0
3EK7 210…
18*
15.3
3EK7 180 -3AD4
61.5
47.0
49.2
3EK7 210…
21*
17
3EK7 210 -3AE4
67.3
51.4
53.9
19.5
3EK7 240 -3AF4
77.6
59.2
62.0
22
3EK7 270 -3AF4
87.7
66.9
70.1
24.4
3EK7 300 -3AH4
96.6
73.8
77.3
33
27.5
3EK7 330 -3AH4
108
82.7
86.6
36
29
3EK7 360 -3AH4
119
90.6
94.9
FOW
0.5 µs,10 kA
[kV]
1.5 kA
8/20 µs
[kV]
3 kA
8/20 µs
[kV]
3EK7 180…
23
3EK7 300…
Table 2: Typical 3EK7 arresters for system voltages
according to the latest IEEE Std C 62.22
Table 5: 3EK7 heavy duty
Voltage per unit MCOV
[kV]
1.8
1.7
3EK7 heavy duty
1.6
3EK7 riser pole
[kV]
3
2.55
3EK7 030 -4AB4
8.9
6.8
7.1
6
5.1
3EK7 060 -4AB4
17.7
13.5
14.2
9*
7.65
3EK7 090 -4AB4
26.4
20.2
21.1
8.4
3EK7 100 -4AC4
29.3
22.3
23.4
10*
1.5
12
10.2
3EK7 120 -4AD4
35.2
26.9
28.2
1.4
15
12.7
3EK7 150 -4AD4
43.9
33.5
35.1
18*
15.3
3EK7 180 -4AE4
52.7
40.2
42.2
21
17
3EK7 210 -4AF4
61.5
47.0
49.2
1.3
1.2
1.1
0.01
0.1
1
10
100
1000
10000
Time in seconds
Table 3: Temporary overvoltage preheating to 60° C, no prior duty
4
1.5 kA
8/20 µs
[kV]
24
19.5
3EK7 240 -4AH4
70.2
53.6
56.1
27*
22
3EK7 270 -4AH4
79.1
60.4
63.3
30
24.4
3EK7 300 -4AH4
87.7
66.9
70.1
33
27.5
3EK7 330 -4AK4
96.6
73.8
77.3
36
29
3EK7 360 -4AK4
105
80.5
84.3
Table 6: 3EK7 riser pole
Maximum discharge voltage
Creepage
distance
Flashover
distance
LIWV3)
Height
„H“2)
Net
weight
Packed1)
weight
Standard1)
pallet
weight
Qty. per
pallet
[pcs]
5 kA
8/20 µs
[kV]
10 kA
8/20 µs
[kV]
20 kA
8/20 µs
[kV]
40 kA
8/20 µs
[kV]
125 A
30/60 µs
[kV]
500 A
30/60 µs
[kV]
[inch]
[inch]
[kV]
[inch]
[lbs]
[lbs]
[lbs]
9.1
9.9
11.6
14.0
6.9
7.4
14.6
7.1
94
6.7
3.1
4.3
960
216
18.2
19.8
23.3
28.0
13.8
14.9
14.6
7.1
94
6.7
3.2
4.4
987
216
27.2
29.7
34.9
42.0
20.7
22.3
14.6
7.1
94
6.7
3.3
4.5
1013
216
30.3
33.0
38.8
46.6
24.8
24.8
14.6
7.1
94
6.7
3.4
4.6
1026
216
35.2
38.4
45.1
54.3
26.8
28.9
19.1
8.3
109
7.9
3.9
5.1
1142
216
44.0
48.0
56.4
67.8
33.5
36.1
19.1
8.3
109
7.9
4.1
5.3
1169
216
52.0
56.7
66.6
80.1
39.5
42.7
23.8
9.8
129
9.4
4.8
6.0
1325
216
60.7
66.2
77.7
93.5
46.1
49.8
23.8
9.8
129
9.4
4.9
6.1
1352
216
67.2
73.2
86.0
103
51.0
55.1
30.5
11.3
149
10.6
5.6
7.2
1071
144
75.6
82.4
96.7
116
57.4
62.0
35.4
12.5
165
11.8
6.3
8.0
1180
144
83.9
91.5
107
129
63.8
68.8
35.4
12.5
165
11.8
6.4
8.0
1190
144
92.3
101
118
142
70.2
75.7
48.4
16.5
217
15.7
8.1
9.7
969
96
101
110
129
155
76.6
82.6
48.4
16.5
217
15.7
8.2
9.9
981
96
5 kA
8/20 µs
[kV]
10 kA
8/20 µs
[kV]
20 kA
8/20 µs
[kV]
40 kA
8/20 µs
[kV]
125 A
30/60 µs
[kV]
500 A
30/60 µs
[kV]
[inch]
[inch]
[kV]
[inch]
[lbs]
[lbs]
[lbs]
[pcs]
8.8
9.5
10.9
12.6
6.7
7.2
14.6
7.1
94
6.7
3.2
4.4
991
216
18.2
19.6
22.5
26.1
13.9
14.9
14.6
7.1
94
6.7
3.5
4.7
1042
216
26.1
28.1
32.3
37.4
20.0
21.4
14.6
7.1
94
6.7
3.7
4.9
1084
216
27.3
29.4
33.8
39.1
20.9
22.3
14.6
7.1
94
6.7
3.7
4.9
1091
216
34.7
37.3
42.9
49.6
26.5
28.3
19.1
8.3
109
7.9
4.3
5.5
1229
216
43.3
46.6
53.6
62.0
33.1
35.4
23.8
9.8
129
9.4
5.2
6.4
1410
216
52.0
55.9
64.3
74.3
39.7
42.5
23.8
9.8
129
9.4
5.4
6.6
1458
216
56.9
61.2
70.4
81.4
43.5
46.5
30.5
11.3
149
10.6
6.1
7.3
1083
144
65.6
70.5
81.1
93.8
50.1
53.6
35.4
12.5
165
11.8
6.9
8.5
1260
144
74.1
79.7
91.7
106
56.6
60.6
35.4
12.5
165
11.8
7.1
8.7
1292
144
81.7
87.8
101
117
62.3
66.7
48.4
16.5
217
15.7
8.9
10.6
1048
96
91.5
98.4
113
131
69.9
74.8
48.4
16.5
217
15.7
9.1
10.8
1071
96
100
108
124
143
76.5
81.9
48.4
16.5
217
15.7
9.3
11.0
1090
96
5 kA
8/20 µs
[kV]
10 kA
8/20 µs
[kV]
20 kA
8/20 µs
[kV]
40 kA
8/20 µs
[kV]
125 A
30/60 µs
[kV]
500 A
30/60 µs
[kV]
[inch]
[inch]
[kV]
[inch]
[lbs]
[lbs]
[lbs]
[pcs]
7.5
8.1
9.3
10.8
5.8
6.2
14.6
7.1
94
6.7
3.2
4.4
982
216
15.0
16.1
18.5
21.4
11.4
12.2
14.6
7.1
94
6.7
3.4
4.6
1026
216
22.3
24.0
27.6
31.9
17.0
18.2
14.6
7.1
94
6.7
3.5
4.7
1047
216
24.7
26.6
30.6
35.4
18.9
20.2
19.1
8.3
109
7.9
4.1
5.3
1177
216
29.8
32.0
36.8
42.6
22.7
24.3
23.8
9.8
129
9.4
4.9
6.1
1350
216
37.1
39.9
45.9
53.1
28.3
30.3
23.8
9.8
129
9.4
5.1
6.2
1371
216
44.5
47.9
55.1
63.7
34.0
36.4
30.5
11.3
149
10.6
5.8
7.1
1054
144
52.0
55.9
64.3
74.3
39.7
42.5
35.4
12.5
165
11.8
6.5
7.8
1154
144
59.3
63.8
73.4
84.9
45.3
48.5
48.4
16.5
217
15.7
8.4
10.1
1000
96
66.9
71.9
82.7
95.6
51.0
54.6
48.4
16.5
217
15.7
8.5
10.2
1010
96
74.1
79.7
91.7
106
56.6
60.6
48.4
16.5
217
15.7
8.7
10.4
1029
96
81.7
87.8
101
117
62.3
66.7
62.8
20.5
270
20.1
10.7
12.4
1221
96
89.1
95.8
110
127
68.0
72.8
62.8
20.5
270
20.1
10.9
12.6
1240
96
1) Incl. insulating bracket and disconnector, other accessory weights to be added (see next page); 2) Refer to figure 1 on page 6;
3) LIWV: Lightning impulse withstand voltage of the arrester housing ; (*) Available ex stock
5
Accessories
H*
Outline drawings for common design options are shown
in figures 2, 3 and 4
1.4”
Figure 2: 3EK7 surge arrester with
accessories P12 and P31
Figure 3: 3EK7 surge arrester with
accessories P12, P31 and Q51
3/8”
∅ 4.7”
3/8”
Figure 1: 3EK7 main dimensions; * see tables page 5
0.95”
0.8”
∅ 0.56”
Figure 6: Insulating bracket for duty cycle 3 kV to
21 kV (order code P12); 0.5 lbs
6
10”
8.3”
0.8”
1.6”
3”
1”
3”
6.7”
4.9”
1.6”
1”
0.6”
1.1”
2.5”
1.25”
0.9”
1.3”
0.6”
1.1”
2.5”
1.25”
0.9”
1.3”
Figure 4: 3EK7 surge arrester with accessories P12, P31, P52 and Q11
Figure 5: Disconnector
(order code P31); 0.3 lbs
∅ 0.56”
Figure 7: Insulating bracket for duty cycle 24 kV and above
(order code P12); 0.9 lbs
11”
0.3”
2.4”
1.6”
0.8”
Figure 9: Transformer bracket 11 inches
(order code Q12); 1.8 lbs
0.3”
0.3”
14.5”
3.4”
1.6”
1.6”
Figure 10: Transformer bracket 12.25 inches
(order code Q13); 2.0 lbs
1.8”
3.4”
2.5”
2.7”
2.1”
0.8”
0.56”
1”
1.6” 2.5”
2.25”
0.8”
0.56”
2.4”
0.56”
1.4”
0.56”
12.25”
1.6” 2.5”
2.25”
0.56”
1.6”
Figure 8: Transformer bracket 8.7 inches
(order code Q11); 0.6 lbs
1”
1”
1.6” 2.5”
2.25”
0.8”
0.56”
2.4”
0.56”
0.56”
0.3”
2.4”
8.7”
Figure 11: Transformer bracket 14.5 inches
(order code Q14); 2.0 lbs
2.9”
0…4.75”
∅ 0.4”
1.8”
2.6”
1”
8.6”
7.8”
∅ 0.7”
2”
3.6”
4.1”…5.9”
0.6”
0.7”
2.8”
∅ 0.56”
6”
8”
Figure 12: NEMA X-arm bracket
(order code Q51); 2.9 lbs
Figure 13: NEMA metal bracket
(order code P11); 1.3 lbs
5x45°
5x45°
5x45°
Figure 14: Ground strap for duty cycle 3 kV to 21 kV
(order code P52); 0.13 lbs
0.4”
#11 AWG to #6 AWG
∅
51
0.
0.
”
0.04”
”
0.6
1”
∅
2.25”
18”
0.
56
”
Figure 15: Ground strap for duty cycle 24 kV and above
(order code P53); 0.2 lbs
∅
4”
18”
19”
∅
0.5”
0.
56
”
12”
13”
∅
0.5”
1”
∅
1”
∅
0.
0.
4”
4”
5x45°
#6 AWG to #5 AWG
∅ 3”
Figure 16: Insulated ground lead/Insulated line lead
(order code P51/M51); 0.2 lbs
Figure 17: Bird protection cap
(order code M81); 0.1 lbs
Figure 18: Line clamp
(order code M11); 0.2 lbs
7
Example
Part number
3 E K 7 210 –
Internal use
Duty cycle voltage in kV x 10
–
Classification
Distribution class, normal duty
Distribution class, heavy duty
Riser pole
Standard
IEEE C62.11 with imperial-thread terminals 3/8"
IEEE C62.11 with metric-thread terminals M12
IEC-CEI 60099-4 with metric-thread terminals M12
Housing size
6.7 inch
7.9 inch
9.4 inch
10.6 inch
11.8 inch
15.7 inch
20.1 inch
For internal administrative purpose
3 E K 7
3
A
E
4
210
–
2
3
4
A
B
C
B
C
D
E
F
H
K
4
Standard equipped with
high voltage terminal with 3/8 inch stud,
clamp, washer and nut
ground terminal with 3/8 inch stud,
washer and nut
Example
Part number with mounting accessories
If any accessory is required*
High-voltage terminal equipped with
Line clamp, washer, nut
Insulated line lead, 18 inch
Bird protection cap
Earth terminal equipped with
NEMA metal bracket (hot dip galvanized steel)
NEMA insulating bracket
Disconnector
Insulated ground lead, 18 inch
Ground strap, 12 inch
Ground strap, 18 inch
Mounting auxiliaries
Transformer bracket 8.7 inch
Transformer bracket 11 inch
Transformer bracket 12.25 inch
Transformer bracket 14.5 inch
NEMA X-arm bracket
3 E K 7 210
– 3 A E 4 –
Z
M51 M81
P12
P31
Q11
Z
M11
M51
M81
P11
P12
P31
P51
P52
P53
Q11
Q12
Q13
Q14
Q51
*Other additional parts on request.
Siemens Power Transmission
and Distribution Inc.
Arrester Products
444 Highway 49 S.
Richland, MS 39218
Phone 601-932-9800
Fax
601-932-9911
Order No. E50001-U113-A305-V1-US00
Printed in Germany
TH 263-080302 103133 PA 04080.5
www.usa.siemens.com/energy
www.siemens.com/arrester-download
The information in this document contains general descriptions of the technical options available, which do not always have to be present in individual cases.
The required features should therefore be specified in each individual case at the time of closing the contract.