iPRF and iPRD surge arresters

The Type 1 surge arrester is recommended for electrical installations in the service sector and industrial buildings protected by a lightning conductor or by a meshed cage. It protects electrical installations against direct lightning strikes. It is used to conduct the direct lightning current, propagating from the earth conductor to the network conductors. It must be installed with an upstream disconnection device, such as a fuse or circuit-breaker, whose breaking capacity must be at least equal to the maximum prospective short-circuit current at the installation point. iPRF1 12.5r and PRD1 25r surge arresters also provide Type 2 protection.