FN3-12 Indoor High Voltage Load Break Switches
Overview The FN3-12, and FN3-12R/S series High Voltage Load Break Switches are designed for indoor installations. These switches are suitable for 50Hz AC systems with voltages of 6kV or 12kV. They are used for disconnecting and interrupting load currents and can also serve in switching high-voltage circuits. The switches are equipped with an RN3-type arc-extinguishing […]
Overview
The FN3-12, and FN3-12R/S series High Voltage Load Break Switches are designed for indoor installations. These switches are suitable for 50Hz AC systems with voltages of 6kV or 12kV. They are used for disconnecting and interrupting load currents and can also serve in switching high-voltage circuits. The switches are equipped with an RN3-type arc-extinguishing vacuum interrupter, making them suitable for protection applications.
These load break switches can be used in applications requiring frequent switching operations. They offer reliable performance and safety, with low maintenance needs. The FN3-12 and FN3-12R/S series can also be integrated with CS3 and CS2 manual operating mechanisms for flexibility and ease of operation.
Type designation of FN3-12 load break switches
The FN3-12 type designation for the indoor load break switch is explained as follows:
F: Load Break Switch
N: Indoor Application
3: Design Sequence Number
12: Rated Voltage (kV)
R: With Load Break
S: With Earth Switch
Note: For special requirements, please contact our technical team for tailored solutions.
Operating Environment Conditions
Altitude: ≤1000 meters
Temperature: -10°C to +40°C
Humidity: ≤90% at 25°C
Environment: Free from corrosive gases, dust, and conductive particles
Vibration: No intense vibration or shock
Hazards: Not for explosive or flammable environments
Technical Data for FN3-12 load break switches
The basic technical data for the load switch should comply with the following specifications:
| Model | Rated Voltage (KV) |
Rated Current (A) |
Rated Short-Time Withstand Current (KA/S) |
Rated Peak Withstand Current (KA) |
|---|---|---|---|---|
| FN3-2 | 12 | 400 | 10/2 | 25 |
The fuse specifications for the load switch models are as follows:
| Model | Rated Voltage (kV) |
Rated Current (A) |
Maximum Breaking Current (Effective Value) (kA) |
Maximum Breaking Capacity (MVA) |
Maximum Short-Circuit Current Peak (KA) |
|---|---|---|---|---|---|
| RN3-3
|
3
|
10－50 | 40
|
200
|
24.5 |
| 75-100 | 24.5 | ||||
| 200 | 35 | ||||
| RN3-6
|
6
|
75 | 20
|
200
|
14 |
| 100 | 14 | ||||
| 200 | 19 | ||||
| RN3-12
|
12
|
10－50 | 12
|
200
|
8.6 |
| 75 | 8.6 | ||||
| 100-150 | 15.5 |
Outline and Dimensions of Installation
Figure 1: FN13-12, FN13-12R Type Load Break Switch
| 1. Disassembly | 5. Moving Contact | 9. Lower Insulator |
| 2. Frame | 6. Interruption Blade | 10. Fuse |
| 3. Upper Insulator | 7. Insulation Rod | |
| 4. Main Static Contact | 8. Lower Contact Seat |
Figure 2: FN3-12R/S Type Load Break Switch
| 1. Socket | 2. Frame | 3. Fuse | 4. Load Switch Body |
FAQs for FN3-12 and FN3-12R/S Load Break Switches
- What are the primary applications of the FN3-12 and FN3-12R/S Load Break Switches?
These switches are ideal for load current interruption, switching high-voltage circuits, and protection applications in indoor power systems with 6kV or 12kV ratings. - What makes the FN3-12 series suitable for frequent switching operations?
The switches are equipped with an RN3-type vacuum interrupter, ensuring high reliability and low maintenance even during frequent operations. - Can these load break switches be used in hazardous environments?
No, the FN3-12 series is not designed for explosive or flammable environments. It is suitable for standard indoor installations without corrosive gases or conductive dust. - What is the temperature range for the FN3-12 and FN3-12R/S load break switches?
These switches can operate in temperatures ranging from -10°C to +40°C, making them suitable for most indoor environments. - Can the FN3-12 load break switch be customized for different applications?
Yes, the FN3-12 can be tailored to specific needs, including integrating with different operating mechanisms or adjusting for higher altitude installations. - What is the short-circuit withstand capacity of the FN3-12 load break switch?
The FN3-12 is designed to withstand short-circuit currents with a peak withstand current rating of 25kA and short-time withstand currents up to 10kA for 2 seconds.
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