12V 3A Power Adapter 36W AC to DC 5.5 x 2.1mm Centre Positive

Regulated DC Supply for Network and Desktop Gear

12V 3A Power Adapter is a 36W external supply that converts 100–240V AC mains to a regulated 12V DC rail. It powers routers, switches, NVRs, LED strips and small desktop devices. The 5.5 x 2.1 mm barrel plug uses centre-positive polarity.

Input accepts 50/60 Hz mains across the full 100–240V range. Output holds 12V at 3A continuous, and ripple stays at or below 120 mV peak-to-peak. A 1.2 m output lead ends in a moulded barrel plug. No-load draw sits under 0.3 W.

Over-voltage, over-current and short-circuit protection trip without opening the case. The ABS housing provides Class II double insulation and runs from 0 to 40°C. Efficiency meets Level VI, and the unit carries CE and RoHS marks.

Key Features

• 36W Continuous Output
  The supply holds 12V at 3A for routers, switches and single-board computers.

• Universal AC Input
  The input stage accepts 100–240V at 50/60 Hz without a voltage selector switch.

• Barrel Connector
  A 5.5 mm outer and 2.1 mm inner barrel plug delivers centre-positive polarity.

• Protection Suite

  • Over-voltage clamp limits output above the nominal rail
  • Over-current fold-back limits short-circuit current
  • Thermal shutdown trips on sustained overload

• Level VI Efficiency
  No-load power stays below 0.3 W, which suits always-on network cabinets.

• Moulded 1.2 m Lead
  The fixed output cable removes a separate connector joint at the barrel end.

• Class II Insulation
  Double insulation removes the need for a protective earth conductor.

• Status Indicator
  A single LED confirms DC output during commissioning and fault checks.

Specifications

What’s in the Box

• 12V 3A desktop power supply

• Fixed 1.2 m DC output lead with barrel plug

• Mains input lead

• Quick start leaflet

Why Choose This DC Supply

• A 36W headroom margin covers devices that peak above their idle current draw.

• Wide-range input suits sites with unstable mains or generator changeover.

• The centre-positive barrel matches the common polarity used on routers and NVRs.

• Fold-back current limiting protects the supply when a device faults at the port.

• Level VI efficiency keeps standby consumption low across a cabinet of adapters.

• Double insulation removes earth-loop risk when the supply feeds isolated equipment.

• A moulded lead resists pull strain at the barrel connector during moves.

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