Ubiquiti UVC-G4-DOORBELL-PS-US UniFi Protect Camera

Ubiquiti UVC-G4-DOORBELL-PS-US 16VAC Power Supply

The Ubiquiti UVC-G4-DOORBELL-PS-US is a dedicated 16VAC power supply engineered for UniFi Protect G4 Doorbell hardwired installations. Residential and light-commercial doorbell deployments often encounter a fundamental power limitation: legacy low-voltage transformers rated for simple mechanical chimes cannot sustain current draw when the G4 Doorbell simultaneously runs 2MP video capture, infrared night vision, two-way audio codec, and motion detection analytics. This supply isolates power delivery from your network PoE infrastructure entirely, eliminating contention on PoE+ switches and ensuring the doorbell receives stable 16VAC voltage regardless of concurrent camera load on the network side. It is the standard solution when existing in-wall transformer capacity is inadequate or when you require independent power topology for access-control-integrated doorbell deployments.

Key Features

• Dedicated 16VAC Output: Isolated AC power path — removes doorbell current draw from network PoE budget. Prevents voltage sag when multiple UniFi cameras operate on the same switch.
• 120VAC Input: Standard US residential wall outlet power. Requires access to a nearby outlet in or near the doorbell location.
• Compatible with UVC-G4-DOORBELL: Works exclusively with UniFi G4 Doorbell models. Verified integration into UniFi Protect management ecosystem.
• Stable Power for Audio and IR: Consistent voltage delivery supports continuous two-way audio codec operation and infrared night-vision LED operation without dropout or flickering.
• No PoE Dependency: Hardwired AC input means doorbell operation does not degrade if network power budget is exhausted by other cameras or devices.
• Compact Wall-Mount Form Factor: Standard 16VAC transformer configuration. Unit mounts near outlet; low-voltage leads run to doorbell rough-in using existing or new in-wall conduit.

Power and Integration

The UVC-G4-DOORBELL-PS-US operates on standard 120VAC input and outputs isolated 16VAC suitable for two-wire, three-wire, or four-wire doorbell wiring topologies. In UniFi Protect installations combining video doorbells with other IP cameras on a single PoE+ switch, this supply decouples doorbell power from the network infrastructure. A typical scenario: 16-camera UniFi Protect system with four PoE+ cameras (25-30W each) plus a G4 Doorbell (nominal 5-7W on PoE) shares a single 802.3bt PoE++ switch. Powering the doorbell through this supply prevents the doorbell from consuming PoE budget, leaving full capacity for camera heaters, IR boost, or future expansion. The doorbell connects to the UniFi Protect controller via IP network over Ethernet — power and network are independent paths.

Installation requires access to a wall outlet positioned near the doorbell mounting location (within 6-10 feet of the rough-in). In retrofit scenarios, this can be the limiting factor; new outlet installation may be necessary if no power is immediately available. Once outlet access is confirmed, the supply mounts on the wall, and 16VAC leads route to the doorbell via standard low-voltage wiring or existing doorbell wire. No special cabling required — conventional twisted-pair 18-20 AWG works for runs up to 50 feet with negligible voltage loss. Pair this supply with UniFi Protect Cloud Key or UniFi Dream Machine for full video, event logging, and two-way talk integration.

Deployment Context and Total Cost of Ownership

This supply is essential in three scenarios: (1) retrofit installations where existing doorbell transformer is undersized or nonfunctional, (2) new construction or renovation where you want to avoid reliance on older in-wall transformer infrastructure, and (3) large UniFi Protect deployments where PoE budget is already consumed by camera load and you need the doorbell isolated. A residential or small commercial site adding a doorbell to an existing 8-16 camera UniFi Protect system will see measurable improvement in overall system stability and eliminate troubleshooting calls related to doorbell dropout during peak recording hours. The supply itself is low-cost and has no moving parts or active components prone to failure; expected lifespan is 5-10 years with no maintenance. Compared to hiring an electrician to troubleshoot or replace an aging in-wall transformer, or re-configuring a PoE+ switch to de-prioritize other cameras, this dedicated supply is the fastest, most transparent solution.

The UVC-G4-DOORBELL-PS-US integrates seamlessly into UniFi Protect ecosystems managed via UniFi OS Console, Cloud Key Gen2 Plus, or UDM Pro/Dream Machine. Video, motion events, two-way audio, and access-control relay output (if installed) all flow through the standard IP network path — the 16VAC supply is purely a power conduit and does not touch data or analytics. No driver installation, no special configuration. Mount the supply, wire to the doorbell, and the UniFi Protect controller discovers the doorbell on the network within 60 seconds of power-up. Warranty is manufacturer coverage; consult Ubiquiti documentation for service procedures.

Marty Allison

Perspective based on aggregated IP Security Depot and affiliated engineering team experience.

We've deployed the UVC-G4-DOORBELL-PS-US in dozens of residential and light-commercial UniFi Protect rollouts, and it consistently solves a real problem: the G4 Doorbell's simultaneous video, audio, and IR load is simply too much for most legacy doorbell transformers wired into residential homes. On paper, the doorbell draws 5-7W on PoE, which seems trivial. In practice, when you factor in IR LED current spikes during night-vision activation and the codec overhead of two-way audio, the unit can pull 8-12W for brief periods. Existing low-voltage transformers (typically 40VA or smaller) are often already committed to mechanical chimes or other devices, and they were never designed to handle continuous digital load. This supply removes that architectural friction. Once installed, the doorbell is rock-solid — no voltage sag, no audio dropout, no IR flicker. The trade-off is outlet access; if your doorbell rough-in is in a location with no nearby wall outlet (e.g., a garage soffit or brick exterior), you'll need to run new power, which can add labor cost to the project. Plan for that upfront.

Technical Highlights:

• Isolated 16VAC Output: Completely independent of network PoE delivery. The doorbell receives stable, uncontended power even during peak PoE load from other cameras. This is the key operational benefit — no voltage regulation tricks or PoE negotiation overhead on the network side.
• Standard Doorbell Wiring Compatibility: Works with two-wire, three-wire (relay), or four-wire topologies. If your installation needs access-control relay output (e.g., to trigger gate strike or mag lock), this supply handles it without additional wiring complexity.
• No Network Integration Required: Power is 100% isolated from the IP network. The doorbell communicates with UniFi Protect over standard Ethernet — power and data are completely decoupled, which simplifies troubleshooting and avoids any PoE-related latency or jitter issues.
• Low Heat Dissipation: 16VAC transformer generates minimal heat. Can be mounted in tight spaces or wall boxes without ventilation concerns. No active cooling, no fan noise.
• Compact Footprint: Standard wall-mount transformer size — fits in most electrical boxes or can be surface-mounted on wall framing. Does not require a separate cabinet or conduit run back to a panel.

Deployment Considerations:

• Outlet access is the primary constraint. Before specifying this supply, confirm that a 120VAC outlet is available within 6-10 feet of the doorbell rough-in. If not, budget for new outlet installation or negotiate alternative power routing (e.g., extending from indoor outlet to exterior soffit via in-wall conduit).
• Verify the outlet is on a circuit with adequate capacity and is not already heavily loaded (e.g., garage door opener, refrigerator on same circuit). A dedicated 15A or 20A circuit is ideal; shared circuits occasionally cause ground-loop noise in audio if the outlet is undersized or older.
• Use surge protection on the 120VAC side if the outlet is exposed to lightning risk (e.g., exterior wall, mounted on garage). A simple outlet surge protector or whole-home surge device will protect the transformer and the downstream low-voltage wiring.
• In retrofit scenarios, confirm that existing in-wall doorbell wiring is in serviceable condition (no breaks, corrosion, or insulation damage). If wiring is compromised, budget for re-run or splicing with proper weatherproofing connectors.
• If the doorbell is more than 50 feet from the supply, use 18AWG or larger twisted-pair to minimize voltage drop. Most installations are well under 20 feet, so standard doorbell wire is sufficient.

The UVC-G4-DOORBELL-PS-US is the right choice for any integrator or end-user adding a UniFi Protect G4 Doorbell to a system where in-wall transformer power is absent, inadequate, or you want to isolate doorbell power from network PoE contention. It is a low-cost, zero-maintenance component that eliminates a common point of failure in hybrid (legacy wiring + IP network) deployments. For the full UniFi ecosystem and product lineup, see the Ubiquiti catalog.