Product Overview
The FN7-12DR/400A 630A indoor AC high-voltage load switch is suitable for a three-phase AC power system with an AC frequency of 50Hz and a rated voltage of 12kV. It is used for interrupting load currents and closing short-circuit currents. The combined electrical appliance can interrupt any current up to the short-circuit current and can be used for protection purposes.
Installation and Usage
◆ Normal operating conditions: Ambient air temperature
Upper limit: +40°C
Lower limit: -25°C
◆ Altitude: The altitude is 1000m or below.
◆ Relative humidity: The daily average is not more than 95%, and the monthly average is not more than 90%.
◆ The ambient air should not be significantly polluted by corrosive or flammable gases, water vapor, etc.
◆ There should be no frequent and severe vibrations.
Technical Specifications
| Category | Parameter | Value |
|---|
| Electrical Ratings | Rated Voltage | 12 kV |
| Rated Current | 400 A / 630 A |
| Insulation Performance | Power Frequency Withstand Voltage (1 min, 50Hz) | Phase-to-phase & Phase-to-ground: 42 kV
Isolation Break: 48 kV |
| Lightning Impulse Withstand Voltage (1.2/50 μs) | Phase-to-phase & Phase-to-ground: 75 kV
Isolation Break: 85 kV |
| Withstand Capability | Short-time Withstand Current (4s) | 400 kA / 630 kA |
| Peak Withstand Current | 12.5 kA / 20 kA |
| Switching Performance | Load Switch Closing Capacity (Peak) | 31.5 kA / 50 kA |
| Earthing Switch Closing Capacity (Peak) | 31.5 kA / 50 kA |
Key Highlights
Dual current ratings (400A / 630A) are suitable for different load requirements.
Strong insulation strength ensures system safety under overvoltage conditions.
Reliable short-time and peak withstand performance for high-demand networks.
Optimized load and earthing switch design ensures safe and efficient operation.
Typical Applications
| Application Area | Use Case | Benefit |
|---|
| Urban Power Distribution | Installed in 12kV city substations and switchgear panels | Enhances grid reliability and prevents unexpected outages |
| Industrial Facilities | Used in medium-voltage distribution systems of factories, steel plants, and chemical industries | Ensures stable power supply and fault isolation in harsh environments |
| Renewable Energy Integration | Applied in wind farms and solar power stations for feeder line protection | Improves switching safety and supports green energy connections |
| Commercial Buildings & Complexes | Medium-voltage distribution in data centers, airports, and shopping malls | Provides secure load management with reduced downtime risks |
| Rural Electrification & Utilities | Used in distribution networks supplying villages and remote areas | Offers robust performance against voltage fluctuations and environmental stress |
Customer Feedback from Europe & North America
"We have been using 12kV switchgear components from Wei Shoe Elec in our municipal distribution network for over two years. The disconnect and load break switches have shown excellent reliability during peak load conditions."
— David M., Grid Engineer, UK Power Networks
"The short-time withstand performance is impressive. We tested the unit under fault simulation at 20 kA and it operated flawlessly, which is critical for industrial environments."
— Michael R., Electrical Supervisor, Siemens USA
"Compared to other brands we’ve used, the insulation strength of this 12kV switch is noticeably higher. It has performed well in our solar farm installations where voltage surges are common."
— Anna K., Renewable Energy Consultant, Germany
"What stands out is the mechanical durability. After more than 500 operating cycles, the switch remains smooth and precise, which is a strong advantage for long-term maintenance."
— John P., Facility Manager, General Electric Canada
"We integrated this equipment into our medium-voltage ring main units for a data center project. The performance has been stable, and clients value the enhanced system reliability."
— Mark L., Project Engineer, Schneider Electric USA
