Surge Protection for CCTV and Pro AV Equipment and Its 4 Technologies

4 Technologies used to protect CCTV cameras from lighting strikes

Electronics are Everywhere

As technologies are developing constantly, electronics are widely used in every corner of our life. However, more electronics also cause higher possibilities of being damaged. This implies that there will be big losses not only for residential electronics but even greater for commercial ones.

More Money Paid on Insurance Claims for Lightning Strikes

According to Insurance Information Institute, 2020 Insurance claims for household properties exceeded 2 billion dollars which increased by 225% compared to 2019's 920 billion USD.

However, 2020 had fewer insurance claims (71,551) and an average of 28,885 USD per claim, compared to 2019's 76,860 insurance claims and an average of 11,971 USD per claim. This suggests technological advancement also makes people pay a higher price for electronics.

Although it's a study for households, we can expect that the money paid on the insurance claims might be even greater for the enterprise and government-owned properties due to the much more advanced technologies applied.

How Lightning Strikes Work

Lighting could transmit over cables of ethernet, phone line, television or distribution board, even through power socket. There are lots of electrical devices that use IC chipset would damage by voltage overload caused by the surge.

Types of Lightning

Lightning strikes affect objects in different forms and generally, they can be classified as follows.

Direct Lightening Strike

A direct lightning strike occurs when lightning energy is directed through an object like a human body. a building, and equipment...etc. It typically comes with heating, chemical, and magnetic effects that result in object breakage and even fatalities. Fortunately, it rarely happens.

Indirect Lightening Strike

An indirect lightning strike is the most common phenomenon that affects our life. It happens when lightning strikes an object that seeks a path to pass electromagnetic pulse energy to the second object. Through mediums like the air, cables, and more, the energy will travel to the electronics and eventually damage them by over-voltage and power surges.

Impact of Lightning Strikes


A 200kV lightning strike will typically affect objects in the range of 500M, which is almost five times as large as a football field. Due to the wide coverage, most cases of electronics being damaged are caused by indirect lightning strikes.


Many perceive that lightning strikes produce 50k to 250kA and 50k to 5000k volts. About 90% of them exceed 10kA and around half of the 90% over 30kV. However, the power for household use is only 120V and 15A.

How to Deal with Lightning Strikes

Although there's no mature technology to completely protect electronics from lightning strikes now, we can still filter out low-energy surges using surge-protecting components. Let's take a look at what the components are and how they can deal with the surges.

GDT (Gas Discharge Tube)

  • High surge current (Up to 20KA)
  • Low capacitance ratings. (Under 0.25pF)
  • Zero-volt bias
  • Low interference for high-frequency components
  • To withstand about 10 times surge strike

MOV (Metal Oxide Varistors)

  • Rugged and reliable overvoltage protection
  • High surge capability up to 70kA

TVS (Transient Voltage Suppressor)

  • Low incremental surge resistance
  • Reverse stand-off voltages from 5V to 495V
  • Peak power ratings from 400W to 30kW
  • High current protection up to 15kA


  • Fast response time
  • Long term reliability
  • Low capacitance
  • Cannot withstand high surge strikes (up to 5KA)
  • Cannot be used in power AC/DC line

SC&T's Surge Protectors

Multiple Protections

As mentioned, each protecting component has its pros and cons. SC&T, therefore, combines different protecting units to take advantage of them for different purposes of use.

Full Range of Surge Protectors


For Video + Data + Power Devices
For Video + Power Devices
For Video + Data Devices
For Video Devices


For IP Devices
For PoE Devices


For HDMI Device


For SDI  Devices


For Power Devices

How to Properly Use Surge Protectors

Taking CCTV application as an example, surge protections should be on both camera and DVR. Since electrical conductivity will affect all devices on the same line/ cable, each device should be protected by a surge protector for its best outcome.

Moreover, different protecting components have different purposes of use. If you use an IP surge protector on a PoE device, it will result that power can't be properly delivered or received by the PSE/ PD. Therefore, selecting a dedicated signal for a specific device is also important.


After-sales service is a critical factor to determine a customer's willingness to purchase one's services/ products. Given that, system integrators will typically warrant their services to be trouble-free in a given period of time. In this case, using surge protectors should be greatly taken into account to keep the devices durable and firmly.

Here's a real case. a system integrator used PoE extenders to apply in 100+ PoE cameras in a CCTV system. The Tx units of the extenders were installed outdoor and the Rx units settled in a data center. Unfortunately, lightning strikes badly hit the area and destroyed about 50% of Tx units and 25% of RX units, which results in enormous financial loss.

To address the issue, they decided to use our surge protectors and found them worked perfectly. The damage rate decreased from 50% to 10% for Tx units and 25% to 1% for Rx units in 2 solid years. This improvement saved not only the money loss but also a great amount of time to maintain.

2022-06-07 3:50 pm

Cable Used

Product Name


Power Source



1080p Distance

4K Distance

Optical Fiber Cable

HDMI Fiber Cable


(Reflection of Light)

Power From Source

Video/ Audio




HDMI Fiber Dongle Extender

Mini USB


300M/ 1KM

300M/ 1KM

Network Cable

HDMI CAT5e Dongle Extender


Power From Source

Video/ Audio




HDMI CAT5e Extender

External Power Supply

Video/ Audio




HDMI over IP Extender

Internet Protocol

External Power Supply

Video/ Audio




HDMI KVM over IP Extender*

Video/ Audio/ Keyboard/ Mouse



HDMI Cable

HDMI Repeater


External Power Supply

Video/ Audio




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