Why are concentric surgers crucial in CCTV systems?

In CCTV installations, the video signal is often sent through a coaxial cable (75 Ω). These lines are exposed to overvoltage, especially in the case of lightning, potential differences or interference. Coaxial surge protectors protect the video track, protecting cameras and recorders against signal damage and interference.

Main types of concentric limiters

• BNC single channel breakers / concentrate: protect a single video track, e.g. HDO-1F PRO. :contentReference[oaicite:0]{index=0}
• BNC multichannel security: e.g. Delta 4xBNC OPV-4 limiter, which protects multiple tracks in one housing. {index=1}
• Concentric limiting devices with galvanic separation or condensers: model Axon-VIDEO-TWIST, using gas and semiconductor components for effective protection. {index=2}
• Concentric protectors for RTV / antenna installation: e.g. to coax television lines – provide protection of concentric tracks with multi-track signal. {index=3}

Benefits of Concentric Limiters

• Protection of CCTV equipment: Reduce the risk of damage to cameras and recorders by overvoltage on the video track.
• Stability of the video signal: Good controls have low damping levels, which minimizes loss of signal quality. {index=4}
• Mass isolation: They protect against mass loops and potential differences, which can lead to noise in the signal. {index=5}
• Resistance to atmospheric conditions: Models in IP housing (e.g. BOX HD) can be mounted outside. {index=6}

What should I pay attention to when choosing a concentric limiter?

• Impedance: Select a limiter designed for line 75 Ω to ensure compatibility with CCTV concentrate.
• Maximum discharge current: Make sure that the cap can drain sufficient current in case of a strong surge. {index=7}
• Flight suppression: The lower the damping, the less loss of video signal quality. {index=8}
• Response time: Fast controls react faster, allowing better protection of equipment from sudden strokes. {index=9}
• Installation and grounding: Limiters shall be ground and fitted close to a protected device, e.g. a camera or a recorder. :contentReference[oaicite:10]{index=10}

Example of concentric limiters available in MikaShop

• == sync, corrected by elderman == Key examples: - **:contentReference[oaicite:12]{index=12}** – protects both the concentric line and the power and data → ideal for power cameras. - **:contentReference[oaicite:13]{index=13}** – simple and effective video signal limiter with limited band. - **:contentReference[oaicite:14]{index=14}** – combines CCTV line protection and monitoring. - **:contentReference[oaicite:15]{index=15}** – a high-resistance pulse limiter, e.g. for antennas. Please note that the limiter has the appropriate impedance and works with your CCTV installation.

Frequently asked questions (FAQ)

Does the concentric limiter affect image quality?

If it is well selected (75 Ω) and has low suppression (e.g. 0.3 dB), the impact on video quality is minimal. :contentReference[oaicite:16]{index=16}

Where's the best way to install a switch?

It shall be placed as close to the protected device (cams or recorder) as possible to effectively discharge the surge. :contentReference[oaicite:17]{index=17}

Does the limiter need grounding?

Yes, proper grounding is essential to effective protection. :contentReference[oaicite:18]{index=18}

Can I use a concentric limiter on TV instead of on CCTV?

Yes, but make sure the limiter has an appropriate frequency range and impedance (e.g. limiters for concentric TV installation). :contentReference[oaicite:19]{index=19)

Summary

Concentric surgers are a necessary accessory in professional CCTV installations, especially where the video signal is transmitted by BNC / concentric cable. They protect the equipment from overvoltage damage, stabilize the signal and help avoid interference. At MikaShop we offer different models – from simple BNC limiters to more advanced protectors with additional tracks – to perfectly match the protection to your installation.