There are many parameters that have to be met when one is selecting that ideal Surge Protection Devices as well as circuit breakers. There are many devices that can be used, but it is always important to assess the risk that is involved.

Rules to be considered

It is important to appreciate the fact that Surge Protection Devices are very important. You need to select the best, so as to ensure that you are well protected at all times.

1. Get familiar with the available options. There are many types and categories that you can think about. This is the only way in which you can make the most suitable selection for your needs.

2. You also have to assess the risk of lightning striking as well as the discharge capacities.

3. Protect the Surge Protection Device. It is very important to protect it as well. This makes everything much safer.


There are three different types of devices. To make a distribution switchboard safe, then the Type 2 SPD shield is adequate. You, however, need to concentrate on the discharge capacity.

Risk assessment

It is usually very complex to assess the risk involved. It is a very painstaking process as well. The most important thing is to think of areas where there may be a lot of risk and areas that are not that risky. After this, it should be easy to choose the best SPD that is the best for you. You should evaluate the building that needs protection.

Lightning is a common occurrence in many parts of the earth. There are areas that are high risk than others. Some areas do not experience any lightning at all. The risk with lightning is not the density. Different areas have their own assessment standards. There are countries that make the use of standards a compulsory thing when one is considering a Surge Protection Device for the big buildings that are very sensitive like data centers, hospitals, and industrial facilities.

To be safe, you should always go for the Surge Protection Device. If the area between the Surge Protection Device and the protected equipment happens to be more than 10 meters, then the Surge Protection Devices should be installed on both sides.

Protect the Surge Protection Devices

Usually, the Surge Protection Devices do not trip. However, there are many scenarios that may happen and they include:

  • Thermal runaway that may be caused by some currents when it does not exceed the lightning attributes leading to the destruction of the internal components even though at a slow pace.
  • Short circuit because of exceeding the flow capacity when at maximum. It could also be because of faults that are under Hz from the distribution network such as phase-neutral inversion, neutral rapture and so on. The disconnection is usually provided by one that uses a short circuit, which can be either integrated or external. The device can be a circuit or fuse breaker.

Sometimes it may be necessary to go for an external circuit breaker. However, today many of the manufacturers have them incorporated into one enclosure. A circuit breaker is chosen according to the current within a building where there is a Surge Protection Device. Residential and commercial buildings use different kinds of breakers.