SNO – NO
Metal oxide medium voltage surge arrester with silicone rubber housing. Class DH according to IEC 60099-4:2014. Flat (skirted) housing. Uc 2.4–44 kV, Ur 3–55 kV, In 10 kA, IP 67.
SNO-NO 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 DH according to the current version of the IEC 60099-4 standard (2014, Ed. 3.0). According to the manufacturer, Class DH surge protectors can absorb and dissipate 122% more energy compared to Class 1 surge protectors.
It is produced in the NO body form: a cylindrical, flat-surfaced body without a skirt. This form offers a more compact structure compared to the RP form.
HIGHLIGHTED FEATURES
- Class DH — certified according to the current IEC 60099-4:2014 version.
- Varistor directly molded with silicone rubber
- Skirtless, compact body
- IP 67 protection class
- UV and chemical resistant, self-cleaning silicone surface
- −60 °C … +85 °C operating range
- Low residual voltage
- High energy absorption capacity
- 100% final inspection in the manufacturer's laboratory
- Each arrester is marked with an indelible measurement number
GENERAL TECHNICAL DATA
| Parameter | Value |
|---|---|
| Surge arrester type | SNO |
| Commercial designation (body form) | NO |
| IEC class | DH |
| Standard | IEC 60099-4:2014, IEC 60099-5 |
| Continuous operating voltage (Uc) | 2,4 – 44 kV |
| Rated voltage (Ur) | 3 – 55 kV |
| Nominal discharge current (In, 8/20 µs) | 10 kA |
| High impulse current (4/10 µs) | 100 kA |
| Short-circuit current (Isc) | 20 kA |
| Thermal load transfer value (Qth) | 1,1 C |
| Repeated load transfer rate (Qrs) | 0,4 C |
| Cantilever withstand voltage (Ur = 55 kV) | 250 Nm |
| Vertical load (Fv) | 800 N |
| Terminal tightening torque (Ur = 55 kV) | 50 Nm |
| Protection class | IP 67 |
| Ambient temperature | −60 °C … +85 °C |
| Body material | Silicone rubber |
| Body color | Grey |
| Connection thread | M12 × 27 mm |
| Upper terminal | M12 × 25 |
| Bottom terminal | M12 × 20 |
| Body width | 54 mm |
VOLTAGE LEVELS AND TECHNICAL TABLE
Electrical characteristics
| Ur [kV] | Uc [kV] | Ures 1/2,5 µs 10 kA [kV] | Ures 8/20 µs 5 kA [kV] | Ures 8/20 µs 10 kA [kV] | Ures 8/20 µs 100 A [kV] | Upeak 1,2/50 µs [kV] | Urms 50 Hz 1 dk [kV] |
|---|---|---|---|---|---|---|---|
| 3,0 | 2,4 | 7,73 | 6,84 | 7,39 | 5,59 | 70 | 25 |
| 6,0 | 4,8 | 15,47 | 13,69 | 14,77 | 11,17 | 70 | 25 |
| 9,0 | 7,2 | 23,20 | 20,53 | 22,16 | 16,76 | 70 | 25 |
| 12,0 | 9,6 | 30,94 | 27,38 | 29,54 | 22,34 | 85 | 30 |
| 15,0 | 12,0 | 38,67 | 34,22 | 36,93 | 27,93 | 85 | 30 |
| 18,0 | 14,4 | 46,40 | 41,06 | 44,32 | 33,52 | 100 | 35 |
| 21,0 | 16,8 | 54,14 | 47,91 | 51,70 | 39,10 | 100 | 35 |
| 24,0 | 19,2 | 61,87 | 54,75 | 59,09 | 44,69 | 110 | 40 |
| 25,0 | 20,0 | 64,45 | 57,03 | 61,55 | 46,55 | 110 | 40 |
| 27,0 | 21,6 | 69,61 | 61,60 | 66,47 | 50,27 | 110 | 40 |
| 27,5 | 22,0 | 70,90 | 62,74 | 67,71 | 51,21 | 120 | 55 |
| 30,0 | 24,0 | 77,34 | 68,44 | 73,86 | 55,86 | 130 | 65 |
| 33,0 | 26,4 | 85,07 | 75,28 | 81,25 | 61,45 | 130 | 65 |
| 36,0 | 28,8 | 92,81 | 82,13 | 88,63 | 67,03 | 130 | 65 |
| 39,0 | 31,2 | 100,54 | 88,97 | 96,02 | 72,62 | 140 | 70 |
| 42,0 | 33,6 | 108,28 | 95,82 | 103,40 | 78,20 | 150 | 75 |
| 45,0 | 36,0 | 116,01 | 102,66 | 110,79 | 83,79 | 150 | 75 |
| 48,0 | 38,4 | 123,74 | 109,50 | 118,18 | 89,38 | 150 | 75 |
| 51,0 | 40,8 | 131,48 | 116,35 | 125,56 | 94,96 | 165 | 80 |
| 55,0 | 44,0 | 141,79 | 125,47 | 135,41 | 102,41 | 165 | 80 |
Mechanical characteristics
| Ur [kV] | SSL [N] | SLL [N] | AD [mm] | CD [mm] | A [mm] | B [mm] | H [mm] |
|---|---|---|---|---|---|---|---|
| 3,0 | 1888 | 1437 | 120 | 120 | 80 | 100 | 136 |
| 6,0 | 1888 | 1437 | 120 | 120 | 100 | 120 | 136 |
| 9,0 | 1888 | 1437 | 120 | 120 | 120 | 140 | 136 |
| 12,0 | 1528 | 1163 | 152 | 152 | 140 | 160 | 168 |
| 15,0 | 1528 | 1163 | 152 | 152 | 160 | 180 | 168 |
| 18,0 | 1284 | 975 | 184 | 184 | 180 | 200 | 200 |
| 21,0 | 1284 | 975 | 184 | 184 | 200 | 220 | 200 |
| 24,0 | 1106 | 841 | 216 | 216 | 220 | 240 | 232 |
| 25,0 | 1106 | 841 | 216 | 216 | 240 | 260 | 232 |
| 27,0 | 1106 | 841 | 216 | 216 | 260 | 280 | 232 |
| 27,5 | 976 | 742 | 247 | 247 | 270 | 300 | 263 |
| 30,0 | 870 | 662 | 279 | 279 | 300 | 320 | 295 |
| 33,0 | 870 | 662 | 279 | 279 | 320 | 340 | 295 |
| 36,0 | 870 | 662 | 279 | 279 | 340 | 360 | 295 |
| 39,0 | 785 | 597 | 311 | 311 | 380 | 400 | 327 |
| 42,0 | 715 | 544 | 343 | 343 | 400 | 420 | 359 |
| 45,0 | 715 | 544 | 343 | 343 | 420 | 440 | 359 |
| 48,0 | 715 | 544 | 343 | 343 | 440 | 460 | 359 |
| 51,0 | 656 | 500 | 375 | 375 | 460 | 480 | 391 |
| 55,0 | 656 | 500 | 375 | 375 | 470 | 490 | 391 |
- Protection of electrical equipment
- Protection of compensation devices
- MV distribution networks (up to 52 kV)
- Substations and distribution panels
- Railways
- Mines
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