For the protection of low voltage distribution systems against transient
overvoltage caused by indirect lightning strike and switching operations.
The 3+1 circuit offers a universal solution for surge protection in low voltage distribution systems.
Suitable for TT- and TN-S systems according to IEC 60364-5-53 Clause 534.
Test class II according to IEC 61643-1+A1.
SPD-type T2 according to EN 61643-11.