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Switch Mode Power Supplies

A switch-mode supply turns mains into the steady DC that AV and electronic kit relies on. This Mercury range spans compact units with selectable 3-12V output and a set of adaptor plugs, through to high-current 13.8V PSUs from 50W up to 600W for hungrier gear. Match the voltage and current draw of your device, then power it cleanly from a single regulated source.

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What a switch-mode supply does

A switch-mode power supply takes mains and turns it into the steady direct current that AV gear and electronic kit relies on. Compared with older linear designs, switch-mode units are compact for the power they deliver and run efficiently, which is why they sit behind so much modern equipment. The result is a small, light unit that gives a clean DC feed without the bulk an equivalent older design would carry.

Selectable low-voltage units

The compact units in this range offer a selectable 3-12V DC output and arrive with a set of adaptor plugs, so one supply can power a variety of small devices. They suit routers, lighting controllers, small AV boxes and other low-draw gear that came without its own supply, or where the original has been lost or damaged. Being able to set the voltage and swap the plug tip means a single unit can stand in for several mislaid supplies.

Higher-current 13.8V supplies

For hungrier equipment there are 13.8V DC supplies running from 50W up to 600W, including multi-channel units. These suit radio gear, larger AV setups and workshop equipment that needs a stronger, regulated source from a single unit rather than several smaller plugs. The higher-current units give a dependable feed for kit that draws more than a small adaptor could supply.

Matching a supply to your device

The key is to match both the voltage and the current draw of what you are powering. Check the device for its required DC voltage and how much current it pulls, then pick a supply that meets the voltage and comfortably covers the current. Running a supply with some headroom rather than at its limit keeps things cool and steady over a long session.

Clean, regulated power

A regulated supply holds its output steady as the load changes, which matters for sensitive electronics that dislike a wandering voltage. Powering kit from one good source also tidies a setup that might otherwise rely on a tangle of separate plugs, and gives you one unit to check if something stops working. Free UK delivery over £99, worldwide shipping.

Frequently Asked Questions

What is a switch-mode power supply?
It is a unit that converts mains into steady DC for AV and electronic equipment. Switch-mode designs are compact for the power they give and run efficiently, which is why they sit behind much modern kit.

What does the selectable 3-12V output mean?
The compact units let you select a DC output between 3 and 12V and come with a set of adaptor plugs, so a single supply can power a range of small devices at the voltage each one needs.

How do I choose the right supply for my device?
Match both the voltage and the current draw of your device. Check its required DC voltage and how much current it pulls, then pick a supply that meets the voltage and comfortably covers the current.

What are the higher-current 13.8V units for?
The 13.8V supplies, running from 50W up to 600W including multi-channel units, suit hungrier gear such as radio equipment and larger AV setups that need a stronger regulated source.

Why use a regulated supply?
A regulated supply holds its output steady as the load changes, which matters for sensitive electronics. It also lets you power kit from one clean source instead of several separate plugs.

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