Power Supplies & Transformers

RS offers 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 PSUs.

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 to be powered.

What is the difference between types of power supply?

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 power 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
Power Supplies
Power Supplies

Renewable Energy
Renewable Energy

Transformers
Transformers

Voltage Converters
Voltage Converters

22886 Products showing for Power Supplies & Transformers

1 of 999+
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MEAN WELL AC Input DC 120 W
  • RS Stock No. 122-2208
  • Mfr. Part No. EDR-120-24
Subtotal (1 unit)
$57.30(exc. GST)
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RS PRO
  • RS Stock No. 123-2501
Subtotal (1 unit)
$188.70(exc. GST)
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RS PRO 1 Output 1000 VA Chassis Mount Transformer, 230 V ac, RoHS, IEC/BS/EN 61558-2-6, AS/NZS 61558.2.6, CE, IEC/BS/EN
  • RS Stock No. 504-296
Subtotal (1 unit)
$191.37(exc. GST)
In Stock
RS PRO Variac, 1 Output, 1 Phase 3.6 kVA, 240 V 0 to 270 V
  • RS Stock No. 890-2812
Subtotal (1 unit)
$551.39(exc. GST)
In Stock
RS PRO, 18V Input
  • RS Stock No. 179-3346
Subtotal (1 unit)
$47.90(exc. GST)
In Stock
MEAN WELL AC Input DC
  • RS Stock No. 122-2227
  • Mfr. Part No. SDR-960-48
Subtotal (1 unit)
$504.71(exc. GST)
In Stock
MEAN WELL AC Input DC 240 W
  • RS Stock No. 122-2228
  • Mfr. Part No. NDR-240-24
Subtotal (1 unit)
$112.61(exc. GST)
In Stock
Legrand
  • RS Stock No. 383-295
  • Mfr. Part No. 0 427 87
Subtotal (1 unit)
$213.12(exc. GST)
In Stock
RS PRO 20 VA DIN Rail Transformer, 380 to 420 V ac Primary, 230 V ac, 24 V Secondary, IEC/BS/EN 61558-2-4, AS/NZS
  • RS Stock No. 123-5698
Subtotal (1 unit)
$206.04(exc. GST)
In Stock
RS PRO 50.4 W AC-DC Converter Power Supplies AC/DC Adapter Global 24V dc Output, 2.1 A
  • RS Stock No. 200-8931
Subtotal (1 unit)
$37.14(exc. GST)
In Stock
RS PRO 56YSD30S Switched Mode Power Supply DIN Rail Power Supply 264V ac 24V dc, 1.25 A Output 36 W
  • RS Stock No. 225-9904
Subtotal (1 unit)
$39.89(exc. GST)
In Stock
MEAN WELL MDR Switched Mode DIN Rail Power Supply 264V ac AC Input 30V dc, 2.5 A Output DC 60 W
  • RS Stock No. 428-477
  • Mfr. Part No. MDR-60-24
Subtotal (1 unit)
$48.04(exc. GST)
In Stock
RS PRO
  • RS Stock No. 504-173
Subtotal (1 unit)
$385.97(exc. GST)
In Stock
RS PRO
  • RS Stock No. 880-2609
Subtotal (1 unit)
$265.02(exc. GST)
In Stock
MEAN WELL XDR-75E DIN Rail DIN Rail Power Supply 264V ac AC/DC Input 24V, 3.2 A Output DC 76.8 W
  • RS Stock No. 566-855
  • Mfr. Part No. XDR-75E-24
Subtotal (1 unit)
$41.27(exc. GST)
In Stock
ABB 15 W Bell Transformer, 230 V Primary, 24 V Secondary
  • RS Stock No. 179-2214
  • Mfr. Part No. 2CSM228745R0802
Subtotal (1 unit)
$61.58(exc. GST)
In Stock
Riello 220V ac, 240 V ac Input Stand Alone Uninterruptible power supply, 800 VA, iDialog 480 W
  • RS Stock No. 459-819
  • Mfr. Part No. IDG 800/RS
Subtotal (1 unit)
$273.22(exc. GST)
In Stock
RS PRO, 0.6 A
  • RS Stock No. 360-645
Subtotal (1 unit)
$31.98(exc. GST)
In Stock
RS PRO Variac, 1 Output, 1 Phase 720 VA, 240 V 0 to 270 V
  • RS Stock No. 890-2803
Subtotal (1 unit)
$233.42(exc. GST)
In Stock
Omron AC/DC Input DC
  • RS Stock No. 786-6462
  • Mfr. Part No. S8VK-C48024
Subtotal (1 unit)
$432.16(exc. GST)
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