| Current/General/lEC designation | U70B/146 | U100B/146 | U120B/146 |
| Diameter D (mm) | 320 | 320 | 320 |
| Spacing H (mm) | 146 | 146 | 146 |
| Creepage L (mm) | 490 | 490 | 490 |
| Socket soupling (mm) | 16 | 16 | 16 |
| Mechanical failing load (kN) | 70 | 100 | 120 |
| Mechanical routine test (kN) | 35 | 50 | 60 |
| Wet power frequency withstand voltage (kV) | 45 | 45 | 45 |
| Dry lightning impulse withstand voltage (kV) | 100 | 100 | 100 |
| Impulse puncture voltage (P.U) | 2.8 | 2.8 | 2.8 |
| Power frequency puncture voltage (kV) | 130 | 130 | 130 |
| Rodio influence voltage(10kV,1MHz) (μV) | 50 | 50 | 50 |
| Corona visual test (kV) | 18/22 | 18/22 | 18/22 |
| Power frequency electric arc voltage | 0.12s/20kA | 0.12s/20kA | 0.12s/20kA |
| Net weight per unit ( kg ) | 5.9 | 5.9 | 5.9 |
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