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Surge Arresters





Surge Arrester is a protective device used to protect electrical equipment from surges caused by lightning or switching activities. It diverts the surge to the ground by limiting the voltage to withstand levels and protects the equipment installed. The voltage seen by the electrical equipment in the event of surges is very high which can damage its insulation, which causes permanent failure and power disruption. To overcome this situation, surge arrester installation is the solution, which redirects the excessive voltage and current to the ground and safeguards all the equipment in the electrical system.

Surge arresters have many applications, from protecting a home to a utility substation equipment. They are installed in parallel to the equipment to be protected such as on pole mounted transformers, pole mounted riser poles (underground cables) and substation equipment.

There are various types of surge arresters for selection based on system voltage and application

a)    System voltage :  

·       Distribution (3kV to 36kV)

·       Intermediate (3kV to 120kV)

·       Station class (3kV to 220kV)

b)    Application :

·       Outdoor : For application in distribution lines, substation and transmission lines etc

·       Indoor : Used inside panels, link box, RMUs etc

c)     Classification and energy handling capability :

·       Distribution class : 5KA

·       Intermediate & Station Class : 10KA (Class 1 to Class 3)


Polymer Outdoor Surge Monitors

Porcelain Outdoor Surge Arrestors

Polymer Indoor Surge Arrestors


Several accessories are available to use depending on the necessity such as

·       Disconnector : Device connected in series on ground side of surge arrester that separates ground lead from the bottom of arrester when it is failed.

·       Surge Monitor / Counter : Device connected in series on ground side that displays the continuous leakage current and number of surges that have occurred. This data helps to monitor healthiness of surge arrester and helps to take preventive action of replacement. Indigenously designed device that is moisture free, leak proof, UV resistant and flame retardant (V-0).

·       Insulating caps : Used on line side to insulate live part of surge arrester against ground flashover due to accidental contact caused by wildlife. 

Casting type LTC, Insulating base and LTC


Surge Monitor/Counter

Ground accessories : Birdcaps, Brackets & Disconnectors

AB Switches and HG Fuses

AB switches are utilized for manual switching between two power sources or circuits. These switches enable operators to reroute power, conduct maintenance operations, or isolate faulty sections of the network. Commonly found in overhead distribution lines, substations, and other power infrastructure, AB switches play a critical role in maintaining uninterrupted power supply by facilitating control over the flow of electricity between different paths.

Horn Gap (HG) fuse is commonly used in power distribution networks and industrial power systems. It is used for protection against overload / overcurrents on each phase of the network/system and serves as an essential safety device. HG Fuse is used along with A B Switch.

AB Switches.png

Porcelain / Polymer AB Switch

HG Fuses.png

Porcelain / Polymer HG Fuse

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