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Think of a power supply enclosure as the hard hat and toolbox for your electronics — it protects sensitive components from dust, knocks, and even sparks. A well-chosen enclosure keeps voltages contained, prevents accidental shorts, and helps manage heat so your power supply doesn’t turn into a small bonfire. Whether you’re building a bench power supply for the garage or housing an industrial LED driver, picking the right box saves time, money, and headaches down the line.
Enclosures commonly come in plastic (ABS, polycarbonate) and metal (aluminum, steel). Plastics are lightweight and great for low-voltage projects; they weigh only a few ounces for small boxes and resist corrosion. Metals add rigidity, better EMI shielding, and superior heat conduction — an aluminum box that’s 6 in by 4 in by 2 in can act like a heatsink for a small regulator. Pick metal for high-current or noisy environments, and plastic for hobby projects and low-voltage electronics.
Always size up, not down. Measure your PSU plus wiring, connectors, and any extra boards, then add clearance for airflow and mounting hardware. If your transformer is 4 in long and your PCB stack reaches 2 in high, a 10 in long enclosure gives room for cable bends. Crowding components into a tight 3 in space can cause heat buildup and difficult wiring, so allow at least 0.4 in to 0.8 in around critical parts.
Heat kills electronics faster than anything else. Look for enclosures that let you add vents, fans, or an external heatsink. Metal cases naturally spread heat; plastic ones may need cutouts for fans or passive vents. If your power supply dissipates several watts, plan for airflow — a 40 mm fan or a row of 0.2 in vents can make a dramatic difference in operating temperature.
If your project sits near radios or sensitive instruments, EMI shielding matters. Metal enclosures inherently block interference, while plastic boxes can be lined with conductive paint or foil to improve shielding. For compliance with regulations, choose a metal box or a plastic box that can accept a grounded metal plate to isolate noisy components.
Will your enclosure live in a shed, workshop, or outdoors? IP ratings tell you how well it keeps out dust and water. An IP54 box keeps out dust and splashes, while IP65/66 ratings protect against jets of water. For outdoor or damp locations choose at least IP55; for direct exposure to rain or washdown environments go for IP66 or higher. Keep in mind that sealing often adds cost but pays off when moisture is involved.
RS Components is a go-to for engineers and makers alike. You’ll find a broad range of metal and plastic enclosures in plenty of sizes, plus accessories like mounting plates, gaskets, and fans. Their search filters let you narrow by material, IP rating, and dimension in inches, making it quick to find a 6 in by 4 in by 2 in box or something bigger. Stock tends to be reliable, and technical datasheets help with exact cutout planning.
Farnell, also known as element14, stocks professional-grade enclosures and is especially strong for industrial options. If you need an aluminum extruded case for a bench power supply or a sealed polycarbonate box rated for outdoor use, Farnell is a solid place to look. They often list thermal properties and mounting details so you can plan boss locations and standoffs in inches.
Rapid Electronics is popular with hobbyists, schools, and small businesses. They offer affordable ABS and metal boxes, PCB mounting kits, and panel accessories. Rapid tends to carry plenty of small enclosures ideal for single-board projects, and their catalog-style site gives you quick inspiration for boxes that fit Raspberry Pi-sized PCBs and power modules.
CPC (part of the same group as RS) targets the fast-turn buyer who needs a small part quickly. They stock a good selection of enclosures in both plastic and metal forms, and you can often find pack deals with screws, glands, and gaskets. If you want to order a few boxes for prototyping and get them quick, CPC is worth checking.
These builders’ suppliers aren’t purely electronics shops, but they’re handy for rugged outdoor and workshop enclosures. You’ll find weatherproof junction boxes, plastic project boxes, and metal housings that are useful when you need a robust case for a simple power supply or distribution board. Their products are practical — think durable and easy to mount on a wall or a post.
Maplin’s online presence still serves hobbyists with a varied range of small enclosures and project boxes. If you’re after inexpensive ABS cases, acrylic front panels, or small metal boxes for home projects, Maplin usually has a selection that’s easy on the wallet. It’s a handy choice for one-off builds.
Conrad offers a wide European-style catalogue with some unusual enclosure options and accessories. They’re a great source for aluminum extrusions, modular enclosures, and IP-rated cases. If you need a specific panel mount or a low-profile metal case measured in inches, Conrad’s international catalogue is useful for sourcing components that aren’t mainstream.
When you need variety and low prices, Amazon UK and eBay UK deliver a huge selection, from tiny ABS boxes to heavy-duty IP67 enclosures. The trade-off is variability in quality and the need to read reviews carefully. Use these marketplaces for hard-to-find sizes or bulk cheap boxes, but verify material thickness (inches or gauge) and seller reputation before you commit.
If your power supply is small and tied to single-board computers like Raspberry Pi or Arduino, head to hobbyist stores such as Pimoroni and The Pi Hut. They offer laser-cut acrylic cases, small aluminum enclosures, and custom-cut panels sized for tiny power modules in inches. These shops are great for tidy, compact builds and creative form factors.
Picking the correct enclosure size is half measurement and half imagination. Start by laying out your components flat: power supply, transformer, wiring, fuse holders, and connectors. Measure the longest and tallest parts — if your transformer is 3.5 in long and the board is 1.2 in high, a 7 in long by 4 in wide by 3 in deep case gives you room for mounting and airflow. Always allow room for cable bends; a sharp 90-degree turn on power cable will stress the conductors. If you can, prototype with cardboard boxes to visualize spacing before spending on metal or custom work.
Most suppliers offer pre-scored knockouts, but custom cutouts are often necessary for connectors, switches, and displays. You can order lids pre-cut from some suppliers, or DIY with a hole saw, jigsaw, or Dremel. When cutting metal, deburr edges and consider adding a rubber grommet for cable entries. Cut slowly and test-fit components to avoid frustrated rework.
Paint won’t just make your project look smart — it can prevent corrosion on metal cases. Use spray primer and a durable topcoat, and mask off areas before painting. For labeling, vinyl stickers and laser-printed adhesive sheets create a clean, professional faceplate. If you’re building for customers, engraved front panels are worth the investment.
Standoffs, mounting rails, and internal brackets transform a bare box into a secure, serviceable enclosure. Many suppliers sell PCB standoffs in brass or nylon measured in inches or fractions of an inch. Use captured nuts or rivet nuts in metal cases for strong mounting points. For field serviceability choose captive screws and removable lids so you can open the case with a standard screwdriver.
Gaskets are the difference between a damp box and a weatherproof one. Silicone or EPDM gaskets compress to seal the lid; if you need IP-rated protection, ensure the supplier supplies the correct gasket and that lid screws are evenly tightened. For cable entries use cable glands sized appropriately for your cables in inches, and consider potting or sealant for permanent outdoor installs.
Simple steps often have the biggest impact on keeping things cool. Place heat-generating components near a metal wall so heat conducts away, mount fans to create a steady airflow through vents, and use thermal pads between regulators and metal walls. If your power supply draws 5 amps continuously, consider a 1 in by 1 in aluminum plate to spread heat. Monitor internal temperatures with a sensor during a burn-in test; a steady 10°F drop after adding a fan is significant.
Cheap enclosures are tempting, but consider lifecycle cost. A flimsy plastic box might save a few dollars now but could crack or fail if dropped, leading to component damage or even safety hazards. Balance budget against requirements: for a hobby desk project, a $10 ABS case might be fine; for a fielded industrial supply, spend on a robust aluminum or IP-rated box that can handle a few bumps and lasts years. Often, spending 20% more upfront avoids replacements later.
Let’s look at a few scenarios. For a small bench power supply that dissipates 10 to 20 watts, an aluminum extruded case 8 in long by 3 in wide by 2 in deep works well — add a 40 mm fan and vents. For an outdoor LED driver exposed to weather, choose a sealed polycarbonate box rated IP66 roughly 6 in by 4 in by 3 in with cable glands and silicone gasket. For a Raspberry Pi-based UPS or small 12 V regulator, a 4 in by 3 in by 1.5 in ABS enclosure from a hobbyist supplier is compact and easy to drill for connectors. These practical pairings save time and get your project running smoothly.
Before you click purchase, run through a quick checklist: do the internal dimensions accommodate your largest components with at least 0.4 in clearance? Does the material match your EMI and thermal needs? Will you need gaskets or cable glands for your environment? Are mounting points or standoffs available? And finally, does the supplier provide datasheets in inches or clear measurements so you know what to expect? A small pause here prevents costly mistakes.
Choosing the right power supply enclosure is a blend of technical needs and practical judgment. Think about protection, heat, EM shielding, accessibility, and the environment where the box will live. Use reputable UK suppliers like RS Components, Farnell, Rapid Electronics, and others for reliable choices, and don’t be afraid to mix and match — a Screwfix weatherproof box with RS-sourced internal hardware often makes a perfect, budget-friendly solution. With the right box, your power supply will be safer, cooler, and way more pleasant to use.
Conclusion: Take the time to match your project’s electrical, mechanical, and environmental needs to the enclosure you pick. With careful measuring, sensible materials choices, and a few simple mods like vents or a heatsink, you’ll have a tidy, reliable power solution that lasts. Ready to shop? Make a list, measure in inches, and choose the supplier that best fits your technical needs and budget.
| Power Supply Enclosures | Price | |
|---|---|---|
| Ubiquiti Flex Utility Pro | £ 64,22 | |
| Ubiquiti Flex Utility Pro | £ 64,22 | |
| Urovo Single Cradle With Psu Eu | £ 67,90 | |
| Urovo Single Cradle With Psu Eu | £ 67,90 | |
| Powerwalker Bp I72t-12x9ah Ups Battery Cabinet Tower | £ 519,55 | |
| Powerwalker Bp I72t-12x9ah Ups Battery Cabinet Tower | £ 519,55 |
