| Application: | High-voltage, High-temperature |
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| Material: | Semiconductor |
| Structure: | Standard Type Insulator |
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Diameter: 255mm | Height:146mm | Creepage distance:320mmU70BL is a glass insulator used for high-voltage transmission lines
Material: Tempered glass
Rated mechanical load:70kN (approximately 7 tons)
Rated voltage: usually used for voltage levels of 35kV and above
Structure: Suspended structure, composed of iron cap, tempered glass umbrella plate, and steel feet
| IEC designation | U70BS/127 | U70BL/146 | |
| Mechanical failing load | kn | 70 | 70 |
| Diameter D | mm | 255 | 255 |
| Height H | mm | 127 | 146 |
| Creepage distance L | mm | 320 | 320 |
| Socket coupling | mm | 16 | 16 |
| Wet power frequency withstand voltage | kv | 40 | 40 |
| Dry lightning impulse withstand voltage | kv | 100 | 100 |
| Power frequency puncture voltage | kv | 130 | 130 |
| Radio interference voltage(10kV 1MHz) | μv | 50 | 50 |
| Corona visual test | kv | 18/22 | 18/22 |
| Power frequency electric arc voltage | ka | 0.12s/20kA | 0.12s/20kA |
| Impulse puncture voltage | P.U | 2.8 | 2.8 |
| Net weight per unit | kg | 3.5 | 3.6 |
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