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Small rectangular black box with BNC connector and screw terminals, 32 by 21 by 15 mm

Bluecctv

Bluecctv AP-VBS-21B 1-Channel Passive Video Balun

SKU CH-GYFR-5TY45

Transmits a single video channel over Cat5 UTP cable up to 1,000 ft without external power, converting BNC to twisted pair with built-in transient protection

  • Transmits video over Cat5 without external power
  • Single-channel passive design simplifies point-to-point cabling
  • Built-in transient protection guards against voltage spikes
  • Operates from -10 °C to 50 °C in up to 95 % humidity
  • Compact 32 × 21 × 15 mm housing weighs 18 g

Single-channel passive balun

The Bluecctv AP-VBS-21B is a one-channel passive video balun designed for CCTV installers who need to run analogue video over standard twisted-pair cable. It replaces a dedicated coaxial run with a single unshielded twisted pair, reducing cable cost and installation time for point-to-point surveillance links.

UTP wiring and transient protection

Each video signal uses one 24-16 AWG unshielded twisted pair measuring 0.5-1.31 mm, with a DC loop resistance of 52 ohms per 1,000 ft. The unit requires no external power supply and includes built-in transient protection, so it fits directly between a camera BNC output and a recorder BNC input without extra hardware.

Extended temperature operation

The balun operates from -10 °C to +50 °C at up to 95 % humidity, maintaining signal integrity across long cable runs in outdoor or industrial environments. Its compact 32 x 21 x 15 mm housing and 18 g weight allow dense mounting inside junction boxes or camera housings where space is limited.

Highlights

  • Transmits video over Cat5 without external power
  • Single-channel passive design simplifies point-to-point cabling
  • Built-in transient protection guards against voltage spikes
  • Operates from -10 °C to 50 °C in up to 95 % humidity
  • Compact 32 × 21 × 15 mm housing weighs 18 g

Specifications

BrandBluecctv
ModelAP-VBS-21B

Questions about this item

How far can the AP-VBS-21B send a video signal over Cat5 before resistance degrades the image?

The DC loop resistance is 52 ohms per 1,000 ft (18 ohms per 100 m), so signal quality depends on the cable length you run.

Does the AP-VBS-21B generate noticeable heat when transmitting continuously in a 50 °C environment?

It is a passive device with no power supply, so it produces negligible heat even at the upper operating limit of 50 °C.

What cable and connectors must I already have to install the AP-VBS-21B?

You need UTP cable (24-16 AWG, 0.5-1.31 mm) for the twisted-pair side and a BNC connector for the camera side.

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