Dahua DHI-VTNC1003C 2-Wire Video Intercom Controller with Isolated Power and Signal Transmission, 48V/0.9A

Product SKU: DHI-VTNC1003C

Product Overview

The Dahua DHI-VTNC1003C is a compact two-wire hybrid video-intercom controller that isolates the input power supply from the signal path to reduce signal absorption and transmission interference. Its simple architecture uses two IN terminals and two OUT terminals, with a specified 48V DC supply and 48V/0.9A output for compatible Dahua door stations and indoor monitors. Dahua lists a 48V/0.9A power adapter and line-termination terminal with the controller. The PC+ABS enclosure measures 65.2 × 46.2 × 23.2mm and consumes 3.5W. It has no Ethernet port or programmable switching functions and must be installed according to an approved two-wire system diagram in a protected, dry and ventilated location.

Key Capabilities

Best For

• Compatible Two-Wire Hybrid Systems: Provides isolated power and signal transmission between approved Dahua intercom devices.
• Residential Intercom Retrofits: Can support selected upgrades where the existing cable and full system topology have been verified.
• Compact Service Locations: The small enclosure fits inside a suitable protected low-voltage or intercom services area.
• Simple VTO-to-VTH Arrangements: The official manual illustrates a one-door-station and one-monitor connection.
• Approved Branched Designs: Can be combined with separate branch and line-termination components where the system diagram requires them.

Why Choose the VTNC1003C

The VTNC1003C performs one focused function within Dahua’s two-wire hybrid architecture: it reduces the effect of the power-supply input on intercom signal transmission. The compact IN/OUT design keeps wiring straightforward, while the specified 48V/0.9A output supports compatible door-station and indoor-monitor arrangements. Its small size suits protected service spaces where a larger multi-port switch would be unnecessary. Supplied by Security Wholesalers, this controller should only be selected after confirming the exact VTO and VTH models, cable route, power demand, optional branch components and approved wiring topology.

Buyer Decision Tips

Key Features & Technical Specifications

Ideal Use Cases

Choosing the Right Model

• Choose the VTNC1003C if: A compatible Dahua two-wire hybrid design requires isolated 48V power and signal transmission through one IN/OUT circuit.
• Choose a multi-port two-wire switch if: The project requires several dedicated device branches or an Ethernet uplink rather than one inline circuit.
• Add a branch terminal if: The approved topology divides the two-wire output between compatible system devices.
• Use the line termination terminal if: The selected diagram and cable arrangement specifically require termination at the end of the line.
• Recheck the power design if: Connected equipment, cable distance or topology differs from the example one-VTO and one-VTH arrangement.

FAQs

1. What does the Dahua VTNC1003C do in a two-wire intercom system?
   The VTNC1003C separates the power-supply input from the two-wire signal path to reduce interference caused by the input power supply during transmission. Its IN terminals connect to the approved 48V supply and door-station side of the circuit, while the OUT terminals feed the compatible monitor side. It is an inline two-wire controller rather than an Ethernet switch, recorder or programmable intercom server.
2. Does the VTNC1003C provide 48V power to the intercom circuit?
   Yes. Dahua specifies a 48V DC supply and a 48V/0.9A output rating. The listed power adapter is also rated 48V/0.9A. The available power must be assessed against the complete approved topology, cable length and connected equipment rather than treated as a general-purpose 48V source. Use the manufacturer-approved adapter and do not connect the controller to multiple power supplies.
3. Which devices can be used with this two-wire controller?
   The controller is intended for compatible Dahua two-wire hybrid video-intercom designs using supported VTO door stations and VTH indoor monitors. Dahua’s application diagrams show one door station and one main indoor monitor, with selected systems also supporting an extension monitor, HDCVI cameras and optional branch or line-termination components. Confirm every device model and wiring diagram before installation because two-wire product families are not universally interchangeable.
4. Is the VTNC1003C a multi-port two-wire switch?
   No. The device has one two-terminal IN connection and one two-terminal OUT connection. It does not provide multiple individually switched branches, RJ45 network ports or device-management functions. Where the approved intercom topology requires branching, Dahua’s manual shows a separate branch terminal, and a line-termination terminal may also be used. Select those components according to the specific system diagram rather than improvising parallel connections.
5. Is a line-termination terminal included?
   Dahua lists a line-termination terminal as the controller accessory. The manual also shows that line-termination and branch terminals can be optional in a simple one-door-station and one-monitor arrangement, depending on the selected topology. Check the actual carton contents and system diagram before installation. A termination component should only be fitted in the position and circumstances specified for the compatible Dahua two-wire intercom design.
6. What precautions apply when wiring the two-wire output?
   Dahua specifically warns that the two conductors connected to the positive and negative OUT terminals must not be short-circuited. Isolate power before connecting or disconnecting conductors, maintain correct terminal placement, use suitable cable and keep the installation within the rated input and output conditions. The controller should be installed by competent personnel in accordance with local electrical rules and the approved Dahua system diagram.
7. Can the controller be installed outdoors?
   The official specification does not publish an IP weatherproof rating. Dahua’s manual requires installation away from dampness, dust, soot, direct sunlight and heat sources, on a stable surface in a well-ventilated location. The operating range is –10°C to +55°C at 10%–95% relative humidity. For outdoor intercom systems, place the controller and power equipment inside a suitable protected enclosure or secure indoor services area.
8. What should I confirm before ordering the VTNC1003C?
   Confirm that the selected VTO and VTH devices belong to a compatible Dahua two-wire hybrid system, then review the official wiring diagram, cable route and required branch or termination components. Verify the 48V/0.9A power arrangement, protected installation location and total system demand. Security Wholesalers can assist with checking the controller against the intended door station, indoor monitor and complete intercom topology.

Compatible Accessories

Listed with the controller:

• 48V/0.9A Power Adapter
• Line-Termination Terminal

System components selected separately where required:

• Compatible Dahua two-wire hybrid VTO door station
• Compatible Dahua two-wire hybrid VTH indoor monitor
• Compatible branch terminal for approved branched topologies
• Suitable two-core cabling and protected installation enclosure

Additional Information

Dahua DHI-VTNC1003C Datasheet