| Customization: | Available |
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| Application: | High-voltage |
| Material: | Glass |
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| IEC designation | U120B/127 | U120B/146 | |
| Diameter D | mm | 255 | 255 |
| Height H | mm | 127 | 146 |
| Creepage distance L | mm | 320 | 320 |
| Socket coupling | mm | 16 | 16 |
| Mechanical failing load | kn | 120 | 120 |
| Mechanical routine test | kn | 60 | 60 |
| Wet power frequency withstand voltage | kv | 40 | 40 |
| Dry lightning impulse withstand voltage | kv | 100 | 100 |
| Impulse puncture voltage | P.U | 2.8 | 2.8 |
| Power frequency puncture voltage | kv | 130 | 130 |
| Radio influence voltage | μv | 50 | 50 |
| Corona visual test | kv | 18/22 | 18/22 |
| Power frequency electric arc voltage | ka | 0.12s/20Ka | 0.12s/20Ka |
| Net weight per unit | kg | 4 | 4 |
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