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.

1Rated voltagekV12
2Maximum working voltagekV12
3Rated frequencyHz50
4Rated currentA630
5Rated closed load breaking currentA630
65% rated active load breaking currentA31.5
7Rated cable charge breaking currentA10
8Rated inductance making currentA40
9Rated shift currentkA1.3
10Rated short-time withstand currentkA20
11Rated peak value withstand currentkA50
12Mechanical lifeOps2000


  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