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How does a Lightning Arrester work?

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The ASLA range of Early Streamer Emission (ESE) Lightning Arresters offers a safe and reliable system to protect your building or solar project from direct lightning strikes. The ESE Lightning Arresters, also known as Active Lightning Arresters, provide an enhanced Radius of Protection, reducing the number of Lightning Arresters and down conductors needed for your building or solar project while still providing complete protection. Contact us now or download our catalogue to understand how does a lightning arrester works and learn more about how you can protect your project.


How does an Early Streamer Emission (ESE) Lightning Arrester work?

The objective of the ASLA range of Lightning Arresters is to become the point of discharge for the lightning bolt, instead of the bolt hitting a random object such as a solar panel or the side of the building. By becoming the point of discharge, the electricity can be safely conducted into the ground using the entire lightning protection system, protecting the structure or solar park.

The ASLA system is based on the time difference (ΔT) between the emission time of a conventional lightning arrester and an early streamer emission lightning arrester, as demonstrated in high voltage testing laboratories. This emission from the ESE is generated by storing energy from the ambient electromagnetic field. In normal conditions, the air terminal stays in standby mode. However, there is a spike in the ambient electrical field when a storm approaches the site. This spike causes the timely release of the stored energy, generating an upward leader from the tip of the ESE lightning arrester. This upward leader moves toward the downward leader from the storm clouds, creating a path for discharge. The bolt then passes safely through the conductive body of the ESE Lightning Arrester to the down conductors and finally safely into the ground, protecting the building or solar project. This working principle allows for an enhanced radius of production provided by Early Streamer Emission Lightning Arrester than by a conventional lightning rod.

As per NFC 17-102, the ΔT for an ESE Lightning Arrester should be at least 10μs - this means that the emission time of the ASLA ESE is at least 10μs faster than those from a Franklin Rod. Our range of ASLA ESE products ranges from a ΔT of 10μs to 60μs, depending on the requirements of the project.


What is the Radius of Protection for an ESE Lightning Arrester?

A lightning arrester works on the radius of protection of the ASLA. Which is based on the calculations of NF C 17-102 and is dependent on the ΔT for the ESE model and the height of the structure. The Radius of Protection required for your structure will be based on the level of protection (class I, II, III or IV) defined during the risk assessment done as per IEC 62305-2. The maximum permissible ΔT according to the standards is 60μs and thus, the maximum Radius of Protection cannot exceed 120m for Class IV Protection.


Certified Lightning Protection

As a leading global name in Lightning Protection for the past 25 years, the Axis range of ESE Lightning Arresters is heavily tested using in-house facilities and third-party laboratories as per NFC 17-102 to ensure the highest levels of quality.


Highlights of ASLA products:

  1. ASLA complies with the International NFC 17–102 and IEC 62305 standards, ensuring safety for your structure.
  2. With a single Smart Lightning Arrestor, your protection radius is extended in comparison to conventional systems.
  3. Installation is simple since one ASLA replaces multiple conventional arrestors.


Technical Specification:

Order Code ΔT (μs ec) Protection Radius (M)
Level 1 Level 2 Level 3 Level 4
ASLA -015 15 30 35 42 48
ASLA -030 30 48 56 64 71
ASLA -045 45 65 72 83 93
ASLA -060 60 80 89 101 111



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