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:[email protected] 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.