DS-N, DS-BNC and S-UHF are coaxial surge protectors with a high surge current capacity, suitable for
use at zone interface 0 to 2. They are designed primarily for the RF region. Their low insertion loss and low-capacitance design also make these surge protectors ideal for very high frequency ranges. The voltage limiting component is a gas discharge tube with a high power handling capacity.

The λ/4-protectors of type LP 7/16 act as narrow-band filters. They pass only a narrow frequency range. Other frequencies are short-circuited and diverted. Insurge protectors of this design, a direct short-circuit is established between the inner and outer conductors. This short-circuit takes the form of a coaxial line of precisely defined length, an electrical wavelength of one-quarter of the wavelength (λ/4) of the frequency to be transmitted.