Power Supplies (PSU)

Power supply units (PSU) convert AC mains electricity into the DC voltages required by electronic systems and components. They are found in desktop computers, workstations, servers, industrial equipment and custom electronics where stable, regulated DC power is required. PSUs are chosen when a reliable conversion of household or facility AC voltage to multiple DC rails, or a single DC output with protection features, is needed for correct system operation. These devices include internal and external form factors and can offer additional functions such as voltage regulation, overcurrent protection, short-circuit protection and power-factor correction. Technical specifications such as maximum wattage, efficiency rating, connector type and output voltages determine suitability for specific hardware and use cases. Proper selection of a PSU reduces the risk of component failure and ensures the power demands of the system are met under expected load conditions.

Types of PSU

Common types of power supply units differ by form factor, application and topology.

• ATX internal PSUs for consumer desktop computers.
• Server and rackmount PSUs designed for redundant and high-density environments.
• External (brick) power adapters used with laptops, routers and small devices.
• Industrial DIN-rail and open-frame PSUs for automation and control equipment.
• Modular and non-modular PSUs that vary by cable management and customization.

What are PSU used for?

Power supply units provide the electrical energy required by electronic components and subsystems.

• Supplying stable DC voltages to motherboards, CPUs, GPUs, storage drives and peripherals.
• Delivering power in industrial controllers, sensors, and communication modules.
• Providing backup or redundant power configurations in servers and critical systems.
• Converting mains voltage for consumer electronics, network equipment and embedded systems.

Key Differences between PSU

Key differences affect compatibility, performance and reliability.

• Wattage (total continuous output) defines how much power a PSU can supply.
• Efficiency ratings (e.g., 80 PLUS levels) indicate energy loss and thermal output.
• Form factor and connector types determine physical fit and cable compatibility.
• Protection features—overcurrent, overvoltage, undervoltage and short-circuit protection—affect device safety.
• Cooling method—passive, active with fan, or hybrid—impacts noise and thermal performance.
• Modularity and cable design influence installation flexibility and airflow in enclosures.

How to Choose PSU?

Selecting an appropriate PSU requires matching specifications to system requirements and environment.

• Calculate the expected power draw of all components and choose a PSU with sufficient continuous wattage and a safety margin (commonly 20–30%).
• Check form factor and connector types for physical compatibility and required power plugs for devices like GPUs and drives.
• Consider efficiency ratings to reduce energy waste and heat; higher efficiency is often beneficial for continuous operation.
• Verify protection features and reliability metrics for critical or sensitive systems.
• Decide on modular versus fixed cabling based on ease of installation and enclosure airflow needs.
• Account for environmental conditions—temperature, dust and vibration—and choose industrial-grade designs if required.

Which power supplies (psu) are the most popular and affordable in 2026?

The full list of popular models at affordable prices is available on this page. In 2026, the following models show high demand and an excellent price-to-quality ratio:

• Spectrum SYSTEM SHIFT 48V Power Supply WLD+40018 for 5.99€
• HiSmart DR-150-24 DIN Rail Power Supply 24V 6.25A 150W for 23.99€
• Power supply CHIEFTEC APB-400B8-BK 400 W, 80 PLUS, active PFC for 30.49€
• Power Supply CHIEFTEC APB-500B8-BK ATX 500W with Active PFC and multi-protection for 31.49€
• Power Supply Unit Chieftec Smart GPS-400A8 400 W for 32.99€

Why is it worth buying power supplies (psu) at AiO.lv?

At the AiO.lv online store, you can place an order at a great price with delivery across Latvia — to Riga, Daugavpils, Liepaja, Jurmala, Ventspils, and other cities, as well as throughout Europe. We offer products from leading manufacturers: ANTEC, ASROCK, ADATA, CHIEFTEC, Cisco, CORSAIR, Dell, EUROCASE, HP, Lenovo, PLANET, Siemens, SYNOLOGY, ZALMAN, Asus, Cooler Master, fsp/fortron, GIGABYTE, MSI, OEM. When you shop with us, you get:

• official warranty and guaranteed quality;
• convenient payment options (including installment and credit);
• fast and reliable delivery across Latvia and to any EU country.

FAQ

Where can you find a power supplies (psu) with cheap prices?

You can buy cheaper at the AiO.lv online store. We offer competitive prices and regular discounts, so you always have the chance to find a great deal.

What is the delivery time for power supplies (psu)?

If you place your order today, delivery will take between 1 and 5 business days depending on the chosen method.

How long is the warranty period for power supplies (psu)?

Our store provides an official manufacturer’s warranty ranging from 12 to 36 months, depending on the model and brand. If needed, you can always contact our customer service department or the manufacturer’s authorized service center for support.

Are power supplies (psu) purchasable with leasing?

Yes, if the selected product costs more than €50. You can learn more about installment purchase options and the terms of application on the Payment page.

Can power supplies (psu) be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and throughout Europe. All product prices are shown with VAT included. In certain cases, a 0% VAT rate may apply — for example, when purchasing from other EU countries with a valid VAT number. We issue an invoice immediately after the order is placed, support BIS electronic invoices, and automatically generate all required accounting documents. To complete a purchase for a company, simply select the company profile during checkout.