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An **AC/DC adapter**, or **plug-in power supply**, is an electrical device that takes input power from a mains power supply and converts or derives the right current, frequency and voltage to power the component it is attached to. Main power supplies provide power to devices that run on batteries or have no other power source. These are suitable for applications such as chargers, set-top boxes, motor control and other office automation products. A plug-in power supply resides outside the main unit, unlike a computer power supply which is internal. You can learn more in our [guide to AC/DC adapters](/web/content/discovery/ideas-and-advice/ac-dc-adapters-guide).

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### How does an AC/DC adapter work?

An AC/DC adapter is made up of a central unit which draws power from an AC outlet, it then converts the power to DC that is used to charge the device. Each AC adapter has a specific power rating, measured in volts or watts that it can handle and the output of a device. Because of the power rating and the type of plug on the end, an AC adapter is not universal and can only be used with devices with the same requirements and connector.

### International Plug Power Supplies

Some plug-in power supplies come with interchangeable input connectors that you can swap when traveling to areas with different plug types such as the United Kingdom, USA, Europe, Japan and Australia. They may also come with protection features such as short circuit, over voltage and overload to suit the international safety approvals making them ideal for the global marketplace.

### Are all AC/DC Adapters the same?

It is possible to use a power adapter on different devices, but it's important to check whether it's AC or DC output. Using close to, if not exactly the correct voltage and Amperage. If you're unsure it might be worth investing in a universal power adapter with lots of different plug fittings.



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AC/DC Adapters, AC DC Power Adapter | RS

AC/DC Adapters

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Plug In AC Adapters | RS

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Power Bricks | RS

Buy 18 V Power Supplies. Browse our latest 18 V Power Supply offers. Free Next Day Delivery.

18 V Power Supplies | AC/DC Adapters | RS

<p>Browse our range of premium 18 V power supplies from industry-leading brands including XP Power, Mean Well, Ansmann, and of course RS PRO. RS aim to supply you with the best PSU solution for all your industrial and commercial applications.</p><p>Highly efficient and built to last our 18 V desktop power supply units are designed to power electrical devices such as laptops, CCTV cameras. They can be used as the main power source or as a backup power supply.</p><h2>Features and Benefits of Desktop PSUs</h2><ul><li>Compact and lightweight</li><li>Extremely efficient</li><li>Tough plastic fully enclosed casings</li><li>Medically approved versions</li><li>Wide input voltage ratings</li><li>Wide variety of output currents</li><li>IEC C8 and IEC C14 connections</li><li>Various cable lengths</li></ul>

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24 V Power Supplies | AC/DC Adapters| RS

<p>If you are looking for a high-quality 24 V power supply, then you have come to the right place. Here at RS, we have a comprehensive selection of 24 V PSUs to suit a whole host of industrial, commercial, and domestic applications.</p><p>Our range of power supply units is supplied to us from some of the industry-leading brands including Mean Well, Mascot, TDK-Lambda XP Power, and not forgetting our own trusted brand RS PRO.</p><p>Designed and tested to the highest standards our 24 V desktop power supplies are highly efficient and have a long electrical life.</p><h2>Typical applications for a 24 V PSU</h2><p>Designed for powering a wide range of portable or fixed equipment 24 V desktop power supplies are perfect for consumer and industrial power solutions. Typical applications include CCTV, laptops, lamps, lighting or instrumentation computing, and office equipment.</p><h2>Features and Benefits</h2><ul><li>Energy efficient</li><li>Highly reliable</li><li>Long electrical life</li><li>Medically approved versions are available</li><li>Fully molded plastic or metal casings</li><li>Wide range of mains input voltages</li><li>24 V ac or 24 V dc outputs</li><li>Wide variety of output currents</li><li>Input connector types including IEC C6, C8, C14</li><li>Various cable lengths</li></ul>

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5 V Power Supplies | AC/DC Adapters | RS

<p>RS are pleased to offer you a selection of high-quality 5 V power supplies from industry-leading brands including Mean Well, TDK-Lambda, and of course RS PRO.</p><p>Compact and lightweight our 5 V desktop power supplies are ideal for use as the main power source in desktop applications or as a backup power supply. Our PSUs are typically used to power small electrical devices including laptops, CCTV cameras.</p><h2>Features and Benefits</h2><ul><li>Highly reliable</li><li>Long electrical life</li><li>Fully enclosed tough plastic cases</li><li>Medically approved options available</li><li>Wide AC voltage input range</li><li>Output power ratings ranging from 10 W up to 50 W</li><li>Input connector types including C8, C14, and 2-pin Euro</li><li>Various cable lengths</li></ul>

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9 V Power Supplies| AC/DC Adapters | RS

<p>RS are pleased to offer you a selection of high-quality 9 V power supplies from popular brands including Mean Well, XP Power, Mascot, and of course our own trusted brand RS PRO.</p><p>Designed, tested, and manufactured to the highest standards our 9 V power supply units are reliable, extremely efficient, and have a long electrical life.</p><h2>Where would I use a 9 V desktop power supply?</h2><p>Compact and lightweight our 9 V PSUs are ideal for use as the main power source in desktop applications or as a backup power supply. Our 9 V power supplies are typically used to power laptops, CCTV cameras, lamps and lighting, and other small electrical devices.</p><h2>Features and Benefits</h2><ul><li>Highly reliable</li><li>Fully enclosed tough plastic cases</li><li>Medically approved options</li><li>Wide AC voltage input range</li><li>9 V ac or 9 V dc outputs</li><li>Output power ratings ranging from 12 W up to 54 W</li><li>Input connector types including C8, C14, and 2-pin Euro</li><li>Various cable lengths</li></ul>

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12V AC Adapters | RS

<p>Thinking of purchasing a 12 V ac adapter, well look no further, here at RS we offer a range of high-quality power supplies to suit your every need. Robust and reliable our plug-in AC to AC adapters have been designed, tested, and approved to the highest standards.</p><h2>Features and Benefits</h2><ul><li>Choose from two different plug types, 3 pin UK type G or 2 pin Euro type C</li><li>Fixed or interchangeable 2.1 mm 2.5 mm output connectors</li><li>Various output currents ranging from 400 ma to 1.5 A</li><li>Highly reliable</li><li>Lightweight, compact, and convenient</li></ul><h2>Where would you use an AC to AC adapter?</h2><p>These popular electronic devices are used in a wide range of industrial, commercial, and domestic applications. Some of the most common are:</p><ul><li>Fans</li><li>Radios</li><li>Desk lamps and LED Lamps</li><li>Antennas</li><li>Children&rsquo;s toys</li></ul>

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Ansmann AC/DC Adapters | RS

<p>RS are pleased to offer you a selection of exceptional quality, reliable AC/DC adapters from the leading brand Ansmann.They pride themselves on manufacturing electronic devices that have been designed, tested, and manufactured to the highest standards. Ansmann AC/DC adapters are built to last and offer long electrical life.</p><h2>Features and Benefits of AC DC Adapters</h2><ul><li>Compact and lightweight</li><li>Robust and reliable</li><li>Extremely energy efficient</li><li>Medically approved options</li><li>Choose from universal, UK, or Euro input plugs</li><li>Wide AC input voltage ranges</li><li>Wide range of DC output voltages</li><li>Fixed or interchangeable output connectors</li></ul><h2>Where would I use an AC/DC power adapter?</h2><p>These popular electronic power supplies are used in a wide range of industrial and commercial applications. Some of the most common are:</p><ul><li>Instrumentation</li><li>Telecommunications</li><li>Computer Peripherals</li><li>Test and measurement</li><li>Medical</li></ul>

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Artesyn AC/DC Adapters | RS

<p>Here at RS, we are pleased to offer you a selection of high-quality AC/DC adapters from the industry-leading brand Artesyn Embedded Technologies. Their power supplies are extremely reliable and have been designed, tested, and manufactured to the highest standards. Built to last Artesyn AC/DC adapters are ideal for a wide range of Industrial and commercial applications.</p><h2>Features and Benefits</h2><ul><li>Compact and lightweight</li><li>Robust and reliable</li><li>Extremely energy efficient</li><li>Medically approved options</li><li>Choose from UK, 2-pin Euro, USB, and global plug types</li><li>Wide input voltage range</li></ul><h2>Where would I use an AC/DC power adapter?</h2><p>These popular electronic power supplies are used in a wide range of industrial and commercial applications. Some of the most common are:</p><ul><li>Instrumentation</li><li>Telecommunications</li><li>Computer Peripherals</li><li>Test and measurement</li><li>Medical</li></ul>

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