When working, it is not only subjected to tension (long rod insulators PQE~PQE4), but sometimes also bending force (line Slotted insulators PQX1~PQX5), due to their small size, cannot be replaced by porcelain, glass and other insulators when the tunnel clear space is small, especially in heavily polluted areas.
| Specifications and models | Rated voltagekV | Rated bending load kN | Structure height(mm) | Insulation distance(mm) | Minimum nominal creepage distance (mm) | Lightning full-wave impulse withstand voltage kV | Power frequency dry withstand voltage kV | Power frequency wet withstand voltage kV | Drawing number |
| FQBN-25/4-JX | 25 | 4 | 780 | 540 | 320 | 190 | 160 | T-3 | |
| FQBN-25/8-JX | 25 | 8 | 780 | 540 | 1710 | 320 | 190 | 160 | T-3 |
| Specifications and models | Rated voltagekV | Rated bending load kN | Structure height(mm) | Insulation distance(mm) | Minimum nominal creepage distance (mm) | Lightning full-wave impulse withstand voltage kV | Power frequency dry withstand voltage kV | Power frequency wet withstand voltage kV | Drawing number |
| FQBN-25/4-JH | 25 | 4 | 860 | 650 | 380 | 220 | 180 | T-4 | |
| FQBN-25/4-JH | 25 | 8 | 860 | 650 | 1850 | 380 | 220 | 180 | T-4 |
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