| Insulator type | D.C. anti-pollution type | ||||
| GB standard No. | XZP1-300 | XZP2-300 | XZP-400 | XZP1-400 | |
| Specified mechanical load (kN) | 300 | 300 | 400 | ||
| Class | U300BP | U400BSP | |||
| Nominal unit spacing (mm) | 195 | 195 | 205 | 205 | |
| Nominal diameter (mm) | 400 | 340 | 340 | 400 | |
| Nominal creepage distance (mm) | 635 | 570 | 545 | 635 | |
| Ball & socket size | 24 | 24 | 28 | 28 | |
| Electro mechanical failing load (kN) | 300 | 300 | 400 | 400 | |
| Mechanical routine test load (kN) | 150 | 150 | 200 | 200 | |
| D.C. withstand voltage（±） | Dry kV | 150 | 140 | 140 | 150 |
| Wet (kV) | 60 | 55 | 55 | 60 | |
| Dry lightning impulse withstand voltage (kV) | 150 | 140 | 150 | 150 | |
| Power frequency puncture voltage（±） | Dry kV | 165 | 155 | 155 | 165 |
| Wet (kV) | 65 | 60 | 60 | 65 | |
| puncture voltage inSF6(+) | 225 | 210 | 210 | 225 | |
| Weigh (kg) | 20.0 | 17.1 | 19.2 | 23.1 | |
| Applicable standard: GB IEC IS | |||||
