1. Determine the need for an SPD:

   • Identify whether you need an SPD for direct or indirect lightning protection.

2. Understand the required characteristics:

   • Once you have determined the need for an SPD, consider the following characteristics to select the appropriate device:
     • Voltage Protection Level (Up): Ensure the SPD can protect against the maximum voltage that may occur during a surge.
     • Nominal Discharge Current (In): This is the current that the SPD can handle repeatedly without degradation.
     • Maximum Discharge Current (Imax): The highest current the SPD can withstand during a surge event.
     • Type of SPD: Choose between Type 1, Type 2, or Type 3 SPDs based on the installation requirements and the level of protection needed.
3. Refer to detailed documentation:

https://www.se.com/be/fr/download/document/CA903014E/
This document gives you more details on the coordination between the SPD or surge arrester and its short-circuit protection device, as well as a specific table and information on the installation of two SPDs or surge arrester in an installation 

4. Consult the Electrical Installation Guide:

• • For additional details on surge protectors, refer to Chapter J of our Electrical Installation Guide, accessible via the link below:
    • https://www.electrical-installation.org/enwiki/Overvoltage_protection
    • or downloaded on the following link: https://www.se.com/ww/en/work/products/product-launch/electrical-installation-guide/

This guide contains detailed information on selecting the SPD or arrester as well as selecting the correct short circuit protective device and installations with multiple SPDs or arresters in the same installation.

Released for:Schneider Electric Belgium