FZN25 FZRN25 12KV 24kV Indoor high voltage electric three pole air vacuum load break switch

1. Rated voltage: 12kV
2. Rated frequency: 50Hz
3. Rated current: Commonly available ratings include 630A, 1250A.
4. Rated insulation level:
   • 1 - minute power - frequency withstand voltage: Phase - to - phase and phase - to - ground 42kV; across the open contacts 48kV.
   • Lightning impulse withstand voltage: Phase - to - phase and phase - to - ground 75kV; across the open contacts 85kV.
5. Rated short - time withstand current (4s): For example, 20kA or 25kA.
6. Rated peak withstand current: For example, 50kA or 63kA.
7. Rated cable charging current breaking capacity: Usually 10A - 25A.
8. Rated no - load transformer breaking capacity: For example, 1250kVA - 1600kVA.
9. Mechanical life: Typically 5000 - 10000 operations.
10. Contact opening distance: About 10 - 12mm.
11. Contact over - travel: Around 3 - 4mm.
12. Three - phase opening and closing non - synchronism: ≤ 2ms.
13. Contact closing bounce time: ≤ 2ms.
14. Average opening speed: 1.0 - 1.2m/s.
15. Average closing speed: 0.6 - 0.8m/s.

For 24kV Model

1. Rated voltage: 24kV
2. Rated frequency: 50Hz
3. Rated current: Similar to the 12kV model, such as 630A, 1250A.
4. Rated insulation level:
   • 1 - minute power - frequency withstand voltage: Phase - to - phase and phase - to - ground 50kV; across the open contacts 65kV.
   • Lightning impulse withstand voltage: Phase - to - phase and phase - to - ground 95kV; across the open contacts 125kV.
5. Rated short - time withstand current (4s): Similar to the 12kV model, e.g., 20kA or 25kA.
6. Rated peak withstand current: Similar to the 12kV model, e.g., 50kA or 63kA.
7. Other parameters related to breaking capacity, mechanical life, contact parameters, etc. are generally in a similar range to the 12kV model but may be adjusted according to the higher voltage requirements.

Product features

1. Good arc - extinguishing performance:
   • They use vacuum as the arc - extinguishing medium. The vacuum environment can quickly extinguish the arc when the contacts are opened, with a short arcing time and high arc - extinguishing efficiency. This allows the switch to safely break load currents, including inductive and capacitive loads.
2. High reliability:
   • The mechanical structure is simple and robust, with fewer moving parts. This reduces the probability of mechanical failures. The electrical life and mechanical life are relatively long, which can meet the long - term stable operation requirements of the power system.
3. Low maintenance requirements:
   • Since there is no need for oil or gas replacement and maintenance, the maintenance workload is significantly reduced compared to oil - immersed or SF6 - filled switches. Only periodic inspections of the contacts and operating mechanisms are required.
4. Compact structure:
   • The overall design is compact, which saves installation space. This makes them suitable for installation in various types of indoor switchgear cabinets, especially in situations where space is limited.
5. Flexible operation:
   • They can be equipped with manual or electric operating mechanisms. Manual operation is convenient for on - site emergency handling, while electric operation enables remote control and automation, which is beneficial for the intelligent management of the power system.
6. Over - current protection (FZRN25 only):
   • The FZRN25 is combined with a fuse. When an over - current fault occurs, the fuse can quickly melt and cut off the circuit, providing additional protection for the electrical equipment and the power system.