MV Surge Arresters

2SS15N – RO

Metal oxide medium voltage surge arrester with silicone rubber housing. With a 700 mm fixed cable outlet from the top. IEC Class 1, Uc 3–40.5 kV, Ur 3.75–50.6 kV, In 10 kA, IP 67.

2SS15N – RO

2SS15N-RO is a metal oxide surge arrester that provides protection against overvoltages and transient events in medium voltage networks up to 52 kV.

The varistor block is directly molded with silicone rubber.

The product is certified as Class 1 according to IEC 60099-4:2004 and IEC 60099-5 standards.

A distinctive feature of the RO housing form is the fixed cable at the upper end: a line connection cable with a length of 700 mm ± 10% extends from the top of the arrester. There is no upper terminal screw; the connection is made directly with this cable.

The lower end has an M12 × 20 grounding terminal.

HIGHLIGHTED FEATURES

  • IEC Class 1 arrester
  • 700 mm ± 10% fixed cable outlet from the top
  • Varistor directly molded with silicone rubber
  • IP 67 protection class
  • High creepage distance (491–1211 mm)
  • UV and chemical resistant, self-cleaning silicone surface
  • −60 °C … +85 °C operating range
  • Residual voltage value at seven different impulse currents
  • 100% final inspection in the manufacturer's laboratory
  • Each arrester is marked with an indelible measurement number

GENERAL TECHNICAL DATA

Body diameterØ70 mm
Parameter Value
Arrester type 2SS15N
Commercial description (housing form) RO
IEC class 1
Standard IEC 60099-4:2004, IEC 60099-5
Continuous operating voltage (Uc) 3 – 40.5 kV
Rated voltage (Ur) 3.75 – 50.6 kV
Nominal discharge current (In, 8/20 µs) 10 kA
High impulse current (4/10 µs) 100 kA
Short-circuit current (Isc) 20 kA
Long-duration current (I2ms) 250 A
Energy absorption capacity (long-duration, W2ms) 2.8 kJ/kV·Uc
Energy absorption capacity (impulse, W4/10) 4.8 kJ/kV·Uc
Cantilever strength (24 kV) 300 Nm
Cantilever strength (36 kV) 250 Nm
Vertical load (Fv) 625 N
Protection class IP 67
Ambient temperature −60 °C … +85 °C
Body material Silicone rubber
Body color Grey
Top connection 700 mm ± 10% cable
Bottom terminal M12 × 20
Base diameter Ø120 mm

VOLTAGE LEVELS — ELECTRICAL

Ur [kV] Uc [kV] 1/20 µs 5 kA 1/20 µs 10 kA 8/20 µs 5 kA 8/20 µs 10 kA 8/20 µs 20 kA 30/60 µs 125 A 30/60 µs 500 A Upeak 1.2/50 µs Urms 50 Hz 1 min
3,75 3 8,55 9,65 7,18 8,78 9,60 7,35 7,85 62 25
5,00 4 12,80 14,20 11,25 12,92 14,15 9,63 10,16 62 25
7,50 6 21,35 23,85 17,95 21,70 23,75 16,98 18,01 62 25
10,00 8 25,60 28,40 26,12 25,84 28,30 19,26 20,32 98 35
12,50 10 34,15 38,05 29,00 34,62 37,90 26,61 28,17 98 35
15,00 12 38,40 42,60 33,15 38,96 42,45 28,89 30,48 98 35
17,50 14 46,95 52,25 39,98 47,54 52,05 36,24 38,33 125 55
20,00 16 51,20 56,80 44,10 51,68 56,60 38,52 40,64 125 55
22,50 18 59,75 66,45 51,26 60,46 66,20 45,87 48,49 125 55
25,00 20 64,00 71,00 55,45 64,60 70,75 48,15 50,80 135 60
26,25 21 67,55 77,10 58,93 67,95 76,25 52,15 54,55 135 60
27,50 22 72,55 80,65 63,00 73,38 80,35 55,50 58,65 135 60
30.00 ⁽¹⁾ 24 76,80 85,20 66,15 75,98 84,90 57,78 60,96 135 60
30.00 ⁽²⁾ 24 76,80 85,20 66,15 75,98 84,90 57,78 60,96 150 65
32,50 26 85,35 94,85 77,20 84,76 94,50 65,13 68,81 150 65
35,00 28 89,60 99,40 84,90 88,21 99,05 67,41 71,12 150 65
37,50 30 98,15 109,05 88,00 96,99 108,65 74,76 78,97 170 70
40,00 32 102,40 113,60 96,05 101,15 113,20 77,04 81,28 170 70
43,75 35 112,30 125,50 97,86 112,81 125,15 85,16 90,12 170 70
45.00 ⁽¹⁾ 36 115,20 127,80 99,10 114,10 127,25 86,67 91,44 170 70
42,50 34 110,95 123,25 96,05 109,93 122,80 84,39 89,13 180 75
45.00 ⁽²⁾ 36 115,20 127,80 99,10 114,10 127,35 86,67 91,44 180 75
50,60 40,5 125,76 136,35 114,89 129,78 146,25 96,12 101,35 180 75

Ures values are in kV.

VOLTAGE LEVELS — MECHANICAL

Ur [kV] AD [mm] CD [mm] A [mm] B [mm] H [mm] N
3,75 257 491 60 90 129 3
5,00 257 491 80 100 129 3
7,50 257 491 100 120 129 3
10,00 303 651 120 140 175 5
12,50 303 651 140 160 175 5
15,00 303 651 160 180 175 5
17,50 353 731 180 200 225 6
20,00 353 731 200 220 225 6
22,50 353 731 220 240 225 6
25,00 380 811 240 260 252 7
26,25 380 811 260 280 252 7
27,50 380 811 270 300 252 7
30.00 ⁽¹⁾ 380 811 320 320 252 7
30.00 ⁽²⁾ 427 891 320 320 299 8
32,50 427 891 340 340 299 8
35,00 427 891 360 360 299 8
37,50 480 1131 295 ⚠️ 380 352 11
40,00 480 1131 380 400 352 11
43,75 480 1131 410 430 352 11
45.00 ⁽¹⁾ 480 1131 420 440 352 11
42,50 517 1211 400 420 386 12
45.00 ⁽²⁾ 517 1211 420 440 386 12
50,60 517 1211 450 470 386 12

⚠️ THREE SPECIAL CASES FOR R FORM ALSO APPLY HERE

1. Dual size option. There are two rows each for Ur = 30 kV and Ur = 45 kV:

Ur Option 1 Option 2
30 kV H 252 mm · 7 sheds · CD 811 H 299 mm · 8 sheds · CD 891
45 kV H 352 mm · 11 sheds · CD 1131 H 386 mm · 12 sheds · CD 1211

2. Sorting disorder. 42.50 kV comes after 45.00 kV — the beginning of the second measurement group. Sort by voltage when entering the site.

3. In the row for Ur = 37.50 kV, the A value is still 295 mm. 360 mm in the lower stage, 380 mm in the upper stage.

  • Indoor and outdoor installation
  • Protection of electrical equipment
  • Protection of compensation devices
  • MV distribution networks (up to 52 kV)
  • Applications requiring flexible line connection
  • Substations and distribution panels
  • Railways
  • Mines
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