A lightning arrestor or Surge Arrestor is a device to protect electrical equipment from over voltage transients caused by External (Lightning) or Internal (Switching) Events.

Construction :

Our lightning arrester are Gapless Metal Oxide type Consist of zinc oxide visitors with superior non linear voltage current characterstics. FRP core / Plastic Core and silicone rubber housing. We are supplying our Surge Arrester with mounting bracket and disconnector as per customer requirements. 

What exactly does a lightning Arrestor Do:

Lightning Arrestor never absorb the lightning, it cannot stop the lightning but it can divert lightning to the earth and only protects the equipment that are connected parallel to it. There are two types of surges one comes directly from the atmosphere such as atmospheric lightning. Second type is originated from the electrical system itself such as switching surges.

The typical lightning arrestor has a high voltage terminal and a ground terminal. At normal voltages the MOV (Metal Oxide Varister) disc is an insulator and will not conduct current. But at higher voltages caused by lightning it becomes a conductor and helps to pass the voltage to earth via its ground terminal

Product Specification Table: 


Product Rating

Arrester Rating

Current Rating

Class of Arrester

1 22 kv 18 kv 5 KA Distribution
10 KA Class-I,II,III


S.No Properties Value
5kA 10kA
1 Rated Arrester Voltage 9 kV(r.m.s) 9 kV(r.m.s)
2 Highest system voltage 12kV(r.m.s) 12kV(r.m.s)
3 Rated Frequency 50Hz 50Hz
4 Discharge Class DISTRIBUTION ClASS-I , II & III
5 Nominal discharge Current 5kA 10 kA
6 Maximum Continuous Operating Voltage 7.56 kV(r.m.s) 7.56 kV(r.m.s)
7 Partial Discharge in Pc. Less than 10 pC Less than 10 pC
8 Lightning impulse Voltage of Housing. 75 kVp 75 kVp
9 High Current impulse withstand at  4/10  μs 65kV 100kV
10 One minute Power frequency With stand Voltage of housing. 28 Kv(r.m.s) 28 Kv(r.m.s)

 Advantages of Composite Insulators over Conventional Porcelain Insulators : 

  • Light weight, Ease of Installation and less transportation charge.
  • Resistance to breakage and vandalism.
  • Unique self-cleaning property, reduced maintenance cost.
  • Hydrophobicity and recovery of hydrophobicity make it suitable for polluted environment and salty atmosphere.
  • Low leakage current in long term ageing.
  • Resistance to puncher due to cutting age technology.
  • Superior UV & weather resistance properties.
  • Sustained hydrophobicity, resulting in lower leakage currents, reduced dry band arcing, and less risk of flashover,
  • Specially formulated high tracking resistance silicone rubber used for sheathing.
  • A higher mechanical strength to weight ratio which enables the construction of longer spans of towers.

Surge Arrester - Tech Details