| Insulator type | AC normal type | |||||
| GB standard No. | XP-240 | XP-300 | XP-400 | XP-420 | XP-530 | |
| Fig | 1 | 1 | 2 | 2 | 3 | |
| Specified mechanical load (kN) | 240 | 300 | 400 | 420 | 530 | |
| Class | U240BS | U300B | U400BS | U420BS | U530BS | |
| Nominal unit spacing (mm) | 170 | 195 | 205 | 205 | 240 | |
| Nominal diameter (mm) | 280 | 320 | 360 | 360 | 380 | |
| Nominal creepage distance (mm) | 405 | 370 | 525 | 550 | 600/700 | |
| Ball & socket size | 24 | 24 | 28 | 28 | 32 | |
| Electro mechanical failing load (kN) | 240 | 300 | 400 | 400 | 530 | |
| Mechanical routine test load (kN) | 120 | 150 | 200 | 200 | 265 | |
| Power frequency withstand voltage | Dry kV | 75 | 75 | 90 | 90 | 95 |
| Wet (kV) | 45 | 45 | 50 | 50 | 55 | |
| Lightning impulse withstand voltage (kV) | 110 | 110 | 140 | 140 | 140 | |
| Power frequency puncture voltage (kV) | 120 | 120 | 130 | 130 | 140 | |
| Radio interference voltage | Test voltage to ground (kV) | 10 | 10 | 10 | 10 | 10 |
| Max . RIV at 1MHz (μV) | 50 | 50 | 50 | 50 | 50 | |
| Weight (kg) | 11.4 | 13.5 | 18.5 | 19.5 | 23.5/27.0 | |
| Applicable standard: GB IEC AS BS IS | ||||||
