CCTV-ADPT-MJ077 Specifications and Features: Complete Guide for Installers & Technicians

Overview of the CCTV-ADPT-MJ077 Adapter

The CCTV-ADPT-MJ077 is a widely used DC power connector adapter tailor-made for CCTV surveillance installations, especially suited to South African environments where reliable, modular, and serviceable cabling is important. Designed primarily for DC barrel-connector power wiring of cameras and video devices, it simplifies integration with UTP or multi-core cable runs commonly adopted in local security projects.

Typical Applications

• Connecting 12V CCTV cameras to mains-powered DC supplies via RG59 or Cat5e/6 cabling
• Retrofits and field repairs when replacing standard DC power leads damaged at site
• Extensions or custom cable assemblies for dome, bullet, or box-type cameras

Specifications Table

Pinout and Wiring

CCTV-ADPT-MJ077 adapters feature a female 2.1mm DC power jack on one end and a two-pole screw terminal block on the other. The typical pinout is:

When adapting UTP pairs (such as in Cat5e cabling), verify polarity-most CCTV cameras expect centre positive on the barrel plug. Use a multimeter to confirm before powering on.

Wiring Example (ASCII Diagram)

 Power Supply (+)  
                             
         [Red Wire/Cat5e]    
                             
                  [V+]  MJ077 Screw Terminal
                             
      [Camera Power In]  2.1mm Barrel Plug (Female)
                             
         [Black Wire/Cat5e]   
                              Power Supply (-)

Compatible Systems and Brands

• Analogue (CVBS), AHD, and some IP cameras powered via DC barrel jack
• Standalone DVR installations using 12V DC distribution boxes
• Brands often used in SA CCTV setups like Hikvision, Dahua, Sunell, Provision-ISR (verify connector size/type for non-standard devices)

Communica stocks a range of compatible CCTV cables, DC power supplies, and connectors to suit various system designs-find details in the Security category online or at major branches nationwide.

Selection Criteria for Installers

• Cable Gauge: Check your field wiring supports the current needed for your total camera load (see current ratings in specifications).
• Barrel Size: 2.1mm is standard for most CCTV, but some brands use 2.5mm or proprietary connectors-confirm before ordering.
• Environmental Placement: While the MJ077 is suitable for indoor and sheltered outdoor runs, use enclosure boxes for harsh/UV-prone settings in SA.

Troubleshooting & Best Practices

• Double-check connector polarity before applying power (centre positive vs negative).
• Test connections using a continuity checker or multimeter to avoid field miswiring.
• Secure all screw terminals tightly; a loose connection can induce intermittent power failures.
• Where damp or dust is present, insulate the joint or use a suitable plastic housing.

Example Calculation: Power Sizing

For a 12V CCTV system with five cameras drawing 350mA each:
Total current = 5 x 0.35A = 1.75A
Ensure your adapter and wiring are rated for at least this load. If your run is over 30 metres, use thicker wires (e.g., 18 AWG) to minimise voltage drop, factoring in local power supply tolerances and safety margins for equipment supplied via South African mains (230V AC -> DC).

Local Availability & Support

• CCTV-ADPT-MJ077 units are routinely stocked at Communica's branches-check live inventory online.
• Bulk buy and account options for contractors, with VAT invoicing for business and tertiary education users.
• Partner products like fused DC distribution boxes, patch leads, and tools available for large or campus-wide installations.

Visit Security & Surveillance and Branches & Trading Hours for convenient branch collections and service.

Sources

• Communica - Security & Surveillance Category
• Coaxial Power Connector Reference (Wikipedia)
• Hikvision - CCTV Cable Selection Tool
• Dahua - Power Accessories
• Surveillance-Video: CCTV Power Supply Guide