Lightning barriers TKS-B, FRD, FLD, FRD 2 and FLD 2 protect electronic measurement and control installations from surges due to atmospheric discharges (storms) or in the form of travelling waves on data lines. Lightning barriers of series FRD 2 and FLD 2 are intended for use in single-wire earth-related systems (symmetrical, potential-related).

Lightning barriers VF and VF-FS are used as precision protection devices in power supplies for computer installations, modems, ripple control installations, etc.to protect them from surges that may be caused by atmospheric discharges (storms) or switching operations.

Lightning barrier VF 230-AC is a surge protection module for control engineering installations, signal current circuits, mains units and computer installations. A protective circuit made up of varistors ensures a very low protection level at a maximum limit discharge surge current of 35 kA.