1. coarse protection (primary overvoltage protection)
Function: Protects against very high overvoltages caused by lightning strikes or switching operations in the power grid.
Devices: Coarse protection arrester (e.g. lightning current arrester, type 1 surge protection)
Installation: Usually in the main distribution board or at the house connection.
Features: Can discharge very high currents, is robust, switches off in the event of an overload or conducts the current directly to earth.
2. middle protection (secondary overvoltage protection)
Function: Reduces overvoltages that can still enter the grid after coarse protection to a safer level.
Devices: Medium protection arrester (type 2 surge protection)
Installation: Distribution level (sub-distribution boards, e.g. on individual floors)
Features: Protects more sensitive devices from residual overvoltages, is often modular and has a shorter response time than coarse protection.
3. fine protection (tertiary overvoltage protection)
Function: Protects sensitive electronics from smaller but still damaging overvoltages.
Devices: Fine protection arresters (type 3 surge protection, e.g. socket strips with surge protection)
Installation: Directly on the socket outlet or on the end device
Features: Protects end devices such as computers, televisions, hi-fi systems, routers, etc. from transient voltage peaks.
Summary in practice:
Lightning protection system + coarse protection (type 1) at the house connection.
Medium protection (type 2) in the distribution board within the building.
Fine protection (type 3) through surge protection sockets or device protection modules on the end device.
For fine protection (type 3), we offer numerous socket strips and adapters in our brennenstuhl® range.