Optimization of replacement decision

Preventive alarm because the arrester is still active and able to protect even with minimum benefits

Improved reliability when installed in "burdensome" environments

Maintaining costs reduction

L 3/30 ... ff is a voltage limiting SPD providing a single mode of protection, typically installed in Sub Distribution Boards (SDB), in TN-systems or in TT-systems in combination with N-PE SPD model I 100, I 52 or I 12 and with connection type CT2 (1+1 or 3+1).

Surge Arresters for MV Medium Voltage systems.
ZU MV is an overvoltage surge arrester for protection of transformers, switchgears and transmission lines from atmospheric and switching overvoltages. Ideal for internal or external installation and where external levels of contamination are high.

ILF 4P 250/400 is a multipole SPD for direct and indirect lightning strikes with integrated network filter for high frequency transients. Used in supply circuits input of Control Room, Data Center and EDP.

LLP (Led Lighting Protection) protection systems are surge protection devices SPD for public illumination used in extra-urban areas to protect against direct lightning strakes or urban areas for protection against indirect lightning strikes.