High-Performance NU-GFPT-12-630 PT Switch for Eco-Friendly 12kV GIS
Product Description
The NU-GFPT-12-630 PT Switch is a specialized solution engineered for 12kV/630A environmentally friendly gas-insulated PT cabinets. It performs critical functions by managing the rated and load currents of the main circuit while providing essential isolation and closing capabilities. This switch is vital for providing control power, enabling precise voltage measurement, and supporting voltage circuits for instrumentation, all within a compact and reliable design that meets GB3804-2017 and GB3906-2020 standards.
Applications
Primary use in 12kV environmentally friendly gas-insulated PT cabinets for urban power grids.
Provides voltage measurement and control power for measuring instruments and protection relays.
Suitable for substations requiring high-reliability isolation in a compact footprint.
Technical Parameters
| No. | Item | Unit | Parameters | Remark |
| 1 | Rated voltage | kV | 12 | |
| 2 | Rated current | A | 630 | |
| 3 | Rated short-time withstand current | kA/S | 20/4 25/4 | |
| 4 | Rated peak withstand current | kA | 50/63 | |
| 5 | Rated short-circuit closing current | kA | 50/63 | |
| 6 | Short circuit closing times | time | 30 | |
| 7 | Power frequency withstand voltage: ground/phase to phase | kV | 42 | In dry air or N₂ In dry air or N₂ |
| 8 | Power frequency withstand voltage: fracture | kV | 48 | In dry air or N₂ In dry air or N₂ |
| 9 | Lightning impulse: ground/phase to phase | kV | 75 | In dry air or N₂ In dry air or N₂ |
| 10 | Lightning impulse: fracture | kV | 85 | In dry air or N₂ In dry air or N₂ |
| 11 | Main loop resistance | uΩ | ≤ 30 | |
| 12 | Mechanical life | time | 5000 |
Drawing

FAQ for Environmentally Friendly PT Switches
- Q: Is this PT Switch suitable for extremely cold climates?
A: Yes. The NU-GFPT-12-630 is verified to operate reliably in ambient temperatures as low as -40°C, making it ideal for northern grid installations.
- Q: Does this Potential Transformer Switch meet international safety standards?
A: It fully complies with the technical requirements of GB3804-2017 and GB3906-2020, ensuring standard-compliant safety and mechanical performance.
- Q: Can it be installed in high-altitude areas?
A: The standard design supports altitudes up to 2000m. For higher requirements, please consult our technical team for a custom solution.
Contact us today for the NU-GFPT-12-630 technical questions or a customized PT cabinet solution.












