Power Supplies

We have a wide selection of power supply units (PSUs) for use in various domestic and industrial applications. Our range includes AC-DC power supply adapters and desktop computer power supply suitable for domestic applications, as well as bench power supplies, DIN Rail and panel mount power supplies and switch mode PSU.

What is a power supply?

Power supplies are a crucial aspect of any electrical equipment, providing reliable power to machinery, computers or other technology devices. A power supply changes a source electric current, such as a mains plug, to the correct voltage, frequency and current needed to operate the equipment safely.

How do power supplies work?

A power supply is used to reduce mains or three phase electricity, often at 240 Vac or 440 Vac down to a voltage that is usable, such as 12 Vdc. The PSU also converts the current rating, in the form of AMPS, to a level that is safe for the device that is to be powered.

What is the difference between the types of power supplies?

There are three main types of power supply: unregulated, linear and switch mode.

An unregulated power supply is the most basic type, they typically output a lot of ripple voltage (i.e. rapidly-varying instability) on the DC output power. If the input voltage varies, the output voltage will vary by a proportional amount. The advantage of an unregulated supply is that it's affordable, simple, and efficient.A linear power supply is similar in construction to an unregulated power supply, with the advantage of an added transistor circuit to regulate the output to a fixed voltage. A switch mode supply, also known as switching power supply, works by stabilising the mains electricity voltage in order to produce a clean, efficient and stable output voltage.

What is power supply efficiency?

Power supply efficiency is known as the amount of power actually provided to the internal circuitry, divided by the amount of power drawn from the mains supply. If a PSU is 50% efficient and is required to provide 50 Watts of power, 100 Watts will be drawn from the main supply. The extra 50 W is lost as heat. A 90% efficient PSU would draw 56 W in the same circumstances.

What industries can power supplies be used in?

Here are some common industries and environments power supplies can be used in:

  • Machine and panel building
  • Maintenance
  • Marine & offshore
  • Military & defence
  • Automotive
  • Electrical wiring
  • Domestic
  • Food and beverage
  • Manufacturing
AC/DC Adapters
AC/DC Adapters
DIN Rail Power Supplies
DIN Rail Power Supplies
Generators
Generators
Linear Power Supplies
Linear Power Supplies
PC Power Supplies
PC Power Supplies
PoE Injectors
PoE Injectors
Power Supply Accessories
Power Supply Accessories
Switching Power Supplies
Switching Power Supplies
Uninterruptible Power Supplies
Uninterruptible Power Supplies

505 Products showing for Power Supplies

15 of 26
In Stock
RS PRO 20 W AC/AC Adapter AC/AC Adapter Type C 24 V ac Output, 800 mA
  • RS Stock No. 139-1776
Subtotal (1 unit)
£15.09(exc. VAT)
In Stock
RS PRO 5 W AC/DC Adapter EU 5 V dc Output, 1 A
  • RS Stock No. 360-639
Subtotal (1 unit)
£7.83(exc. VAT)
In Stock
Better World
RS PRO 400 W PC Power Supply 240V ac 12V dc
  • RS Stock No. 208-3898
Subtotal (1 unit)
£46.05(exc. VAT)
Last RS stock
RS PRO Battery Backed Power Supply 13.8V dc, 5 A, 70 W, Input 195V ac to 253V ac
  • RS Stock No. 828-0188
Subtotal (1 unit)
£192.37(exc. VAT)
In Stock
RS PRO Battery Backed Power Supply 24V dc, 1 A 220V ac
  • RS Stock No. 774-8194
Subtotal (1 unit)
£96.01(exc. VAT)
In Stock
RS PRO 24 W AC/DC Adapter Interchangeable 9 V Output, 3 A
  • RS Stock No. 270-7404
Subtotal (1 unit)
£19.85(exc. VAT)
In Stock
RS PRO 12.5 W AC-DC Converter Power Supplies AC/DC Adapter 12 V dc Output, 1 A
  • RS Stock No. 139-2341
Subtotal (1 unit)
£13.26(exc. VAT)
In Stock
RS PRO Switching Power Supply 36V dc, 2.8 A, 101 W, Input 85V ac to 264V ac
  • RS Stock No. 161-8295
Subtotal (1 unit)
£20.33(exc. VAT)
In Stock
RS PRO Power Adapter AC/DC Adapter 2-Pin (EU) 12 V dc, 13.5 V dc, 15 V dc, 5 V dc, 6 V dc, 7.5 V dc, 9 V dc Output, 3 A
  • RS Stock No. 206-4929
Subtotal (1 unit)
£35.86(exc. VAT)
In Stock
RS PRO 40 W Power Adapter AC/DC Adapter IEC 320 C14 5 V dc Output, 8 A
  • RS Stock No. 204-7562
Subtotal (1 unit)
£27.99(exc. VAT)
Last RS stock
RS PRO Switching Power Supply 24V dc, 1.7 A, 40.8 W, Input 85V ac to 370 V dc, 264V ac
  • RS Stock No. 751-1431
Subtotal (1 unit)
£49.91(exc. VAT)
In Stock
RS PRO 24 W AC/DC Adapter Type C 9 V dc Output, 2.5 A
  • RS Stock No. 124-2204
Subtotal (1 unit)
£18.36(exc. VAT)
In Stock
RS PRO 96 W AC/DC Adapter 15 V dc Output, 6.4 A
  • RS Stock No. 210-7463
Subtotal (1 unit)
£39.48(exc. VAT)
In Stock
RS PRO 22.5 W AC/DC Adapter IEC 320 C8 9 V Output, 2.5 A
  • RS Stock No. 270-7401
Subtotal (1 unit)
£25.05(exc. VAT)
Last RS stock
RS PRO Battery Backed Power Supply 13.8V dc, 1.5 A, 20 W, Input 195V ac to 253V ac
  • RS Stock No. 828-0181
Subtotal (1 unit)
£136.80(exc. VAT)
In Stock
RS PRO 18 W AC-DC Converter Power Supplies AC/DC Adapter EU 15 V dc Output, 1.2 A
  • RS Stock No. 200-8924
Subtotal (1 unit)
£10.96(exc. VAT)
In Stock
RS PRO Compact Economy Primary Switch-Mode DIN Rail Power Supply DIN Rail Power Supply 345V AC/DC Input 28V, 7 A Output
  • RS Stock No. 192-7573
Subtotal (1 unit)
£94.63(exc. VAT)
In Stock
RS PRO 12 W Switched Mode Power Supply AC/DC Adapter EU 12 V dc, 3 V dc, 4.5 V dc, 5 V dc, 6 V dc, 7.5 V dc, 9 V dc
  • RS Stock No. 304-014
Subtotal (1 unit)
£19.87(exc. VAT)
In Stock
RS PRO 12 W AC/DC Adapter EU 12 V dc Output, 1 A
  • RS Stock No. 125-4244
Subtotal (1 unit)
£23.01(exc. VAT)
Temporarily out of stock
RS PRO 18 W AC/DC Adapter AC/DC Adapter Type G 24 V dc Output, 750 mA
  • RS Stock No. 175-3312
Subtotal (1 unit)
£10.87(exc. VAT)
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