Nitek Power Video Balun

Video & Power Balun Combiner

Model Number: VB31AT

  • Combines Video and Camera Power
  • Transmits video up to 750 feet (225 meters) with Passive Transceivers
  • RJ45 connects to UTP Category Cables
  • Two 18AWG wires connect camera power
  • Made in the U.S.A. Tech and Design support available at 800-528-4343

    The Nitek Video and power balun combiner provides video and camera power over a single CAT5 for CCTV twisted pair video transmission up to 750 feet (225 meters) in conventional UTP analog Video applications, 100 meters in TIA/EIA 568 applications.

    The VB31AT is a unique UTP power and video balun which provides an economical means of sending video and camera power over a standard category cable. Video is sent over one pair and camera power is sent over two of the remaining pairs. A mini-coax pigtail with male BNC is used on the VB31AT. A pair of wires are provided for power connection. Connections to the Category cable are made via an RJ45 connector.

    The VB31AT passive UTP power and video balun combiner provides the same high immunity to noise and interference as all of the Nitek baluns for CCTV transmission. This simplified wiring scheme provides a convenient method of powering the camera and allowing for quicker and easier installations. The RJ45 modular jack uses standard 568B wiring so spare network cables can be used. The VB31AT is a UTP transceiver that provides another Security Transmission Solution from Nitek.

    U.S. Patent No. 7,193,149
    • Superior video over ordinary twisted pair cable
    • Immunity to noise and interference
    • Lifetime warranty
    • Built-in surge suppression
    • Passive devices - do not require power
    • Convenient connection to Category cables for video and power
    • Easier to install than coax


    • Intra-building CCTV installations (instead of coaxial cable)
    • Structured cabling environments
    • Multi-camera applications through conduit (more cameras through a smaller diameter


    Two video balun combiner devices (VB43ATF) are required for transmission over a Category 5 cable to provide video, RS422 and power using the RJ45 modular connectors.

    Wire and Cable Recommendations

    The VB31AT is recommended for use with unshielded twisted pair (UTP) wiring. The system will operate over wire gauges from 24 AWG through 22 AWG. Individually shielded pairs should be avoided, as they drastically reduce the operating range of the systems. Multi-pair cable (25-pair or more) with an overall shield are acceptable. Video can be operated in the same communication cable coexistent with telephone, computer, control signals, power voltages and other video signals. While video may be routed through telephone punch-down block terminals, any bridge-taps, also called T-taps and any resistive, capacitive or inductive devices MUST BE removed from the pair.

    For more specific information regarding wire types, gauges and proper installation techniques, please call (800) 528-4343 for technical assistance.
     Transceiver Unit
     Size w/mounting tabs  0.9"H x 1.0"W x 2.0"D
     Power Requirements  NONE REQUIRED
     Power Pass Through  250mA @ 1,000 feet (300 meters) on 24 AWG
    1 Amp @ 100 feet (30 meters) on 24 AWG
     Video Input  1 vpp composite video
    monochrome or color
     Output  Balanced low voltage current loop
     Modular Jack  Standard RJ45
     Video Format  RS170, NTSC, PAL, SECAM,
    CCIR (Color or B/W)
     Video Input  1 vpp composite video
    monochrome or color
     Operating Frequency  DC to 10 MHz
     Common Mode Rejection  >60 dB typ.
     Temperature Range  0 degrees C to +85 degrees C
     Humidity Range  0 to 98%, non-condensing
     Twisted Pair Connection  RJ45 modular connector
     Transient Immunity  Built-in
     Wire Spec  26 to 12 AWG Unshielded Twisted Pair (UTP)
     DC Loop Resistance  51 Ohms/1,000 feet (max) (51 Ohms/300 meters)
     Normal Capacitance  17pF/ft.
     Impedance  100 Ohms +/- 20%
     UTP Category  2 or better

    Select a type of online documentation:

    VB31AT Specification Sheet
    VB31AT Installation Manual
    VB31AT A&E Specification
    VB31AT A&E Specification
    VB31AT Autocad Drawing