Circuit & System Protection


Type 2 gas discharge tube surge arrestors

1 May 2013 Circuit & System Protection

DEHN’s DEHNgate is a family of lightning current surge arrestors with a cable adaptor design for protecting coaxial systems such as CCTV, mobile radio stations, cell sites and antenna systems from potential damage. According to the application, different mechanical and electrical types are available.

The 1/4 wave surge arrestors type DGA L4 provide an internal coaxial connection of the inner conductor as a band-pass. Only frequencies within this band are transmitted. For low-frequency impulses, such as lightning currents, they form a short circuit. This makes them mechanically robust and maintenance-free. Due to their low protection levels and high discharge capacity, they can be used as combined lightning current and surge arrestors.

Type DGA FF TV can be mounted on DIN rails in a space-saving way for protecting satellite systems with several outputs. For single applications such as cable TV, the wall-mounting adaptor, which the device can be clicked into, is helpful. Two F-cable connectors are also included.

If high partial lightning currents can couple into antenna lines or if very high transmission performances are required, 1/4 wave surge arrestors provide the best protection. If an additional remote supply is needed for the antenna, a combination of a gas discharge tube and 1/4 wave technology (DGA LG) should be used. The surge arrestors are made of top-quality material and provide excellent endurance.

Spark-gap based surge arrestors have an internal gas filled surge arrestor and can be defined as a low-pass. This also allows for DC transmission (antenna supply). Peak voltages exceeding the threshold value of the gas discharge tube are discharged.

These surge arrestors provide extensive contact surfaces from the inner conductor to the gas discharge tube. This minimises the burn-off of the material during the discharge and ensures a constant transmission performance.

For more information contact Surgetek, +27 (0)11 792 1303, info@surgetek.co.za, www.surgetek.co.za



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