Vacuum Load Breaking Switch

The FN5-12R(L) type Indoor AC H.V. load switch and fuse box is designed by ourselves, combined with the requirement of our country and based on the advanced foreign technique. It has been tested for long term by full aspects and confirmed to IEC420 “AC H.V. load switch-fuse box”(1990 version) and GB3804 “3-63KV AC H.V. load switch” standard. Compared to the same products of overseas, It has come up to the technique parameter level. For its small size and light weight, it can be used in RMU and compact substations, also widely used for the power distribution of the 12KV line and has the perfect function of open phase protection.
The development of the FN5-12 realized the functions of switch, isolation and earthing.

No. Item Unit Parameters
1 Rated voltage kV 12
2 Maximum working voltage kV 12
3 Rated frequency Hz 50
4 Rated current A 630
5 Rated closed load breaking current A 630
6 5% rated active load breaking current A 31.5
7 Rated cable charge breaking current A 10
8 Rated inductance making current A 40
9 Rated shift current kA 1.3
10 Rated short-time withstand current kA 20
11 Rated peak value withstand current kA 50
12 Mechanical life Ops 2000


  1. Underbed
  2. Insulator
  3. Fusion tube
  4. Trip device
  5. Moving contact
  6. Arcing tube
  7. Counter vane
  8. Fixed contact
  9. Points and share institution
  10. Interlocking apparatus
  11. Load switch operating mechanism
  12. Earthing switch


  1. Load switch
  2. Bend connection
  3. 3/4weided steel tube(Equipped by user)
  4. Operating mechanism