Surge arrester

Type 1 surge arresters, also known as head surge arresters, manage electrical flows with wave lengths ranging from 10 to 350 µs. They are designed to withstand surges directly caused by lightning. They are installed outside the building, close to the point of entry to the electrical network. These surge arresters are capable of handling extremely powerful surges generated by lightning. They comply with the NFC 15-100 standard for regions at high risk of lightning strikes (Keraunic level > 25 days per year), also known as AQ2 zones. In these areas, Type 1 surge arresters are mandatory.

 

Type 2 surge arresters, known as Level 2 surge arresters, only handle electrical flows with wave lengths between 8 and 20 µs. They are designed to protect internal equipment by reducing residual surges to a safe level. They are generally installed at the switchboard or near sensitive equipment. These surge arresters are effective in controlling overvoltages arising from voltage variations and electrical discharges. They are not suitable for zone AQ2. However, they represent a good level of protection for all areas where lightning can strike and damage electrical installations.

 

Type 3 arresters, also known as Level 3 arresters, are additional surge protection devices. They are designed to be installed directly on sensitive equipment, such as computers and electronic devices. These arresters offer final protection by suppressing residual surges to a safe level.