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

27814 Products showing for Power Supplies & Transformers

1390 / 999+
Stocked by manufacturer
Cosel MUS DC/DC Converter, 5V/ 1.2 A, 9V dc Input, 4.5V dc Input 6 W, DIP, 95 °C Max Temp -40 °C Min Temp
  • RS Stock No. 721-840
  • Mfr. Part No. MUS60505C
Subtotal (1 unit)
MYR85.51
MYR85.51/unit
Currently unavailable
Murata Power Solutions MEE1 DC/DC Converter, 12V dc/ 83 mA, 26.4V dc Input, 21.6V Input 1 W, Through Hole, 85 °C Max
  • RS Stock No. 796-2270P
  • Mfr. Part No. MEE1S2412SC
Subtotal 1 unit (supplied in a tube)
MYR24.87
MYR24.87/unit
New product - Preorder today
MEAN WELL SCWN03W8 DC/DC Converter, 3.3V dc/ 600 mA, 75V dc Input, 9V dc Input 3 W, Through Hole, 90 °C Max Temp -40 °C
  • RS Stock No. 765-208
  • Mfr. Part No. SCWN03W8-03
Subtotal (1 tube of 10 units)
MYR677.93
MYR677.93/tube
In Stock
RS PRO 30 W AC/DC Adapter C14 7.5V dc Output, 4 A
  • RS Stock No. 229-7851
Subtotal (1 unit)
MYR171.81
MYR171.81/unit
Stocked by manufacturer
Unifive 12 W AC/DC Adapter AC/DC Adapter DC 12V dc Output, 0.25 A
  • RS Stock No. 723-867
  • Mfr. Part No. UMVUU3012-120010SA PL03B
Subtotal (1 unit)
MYR169.00
MYR169.00/unit
Stocked by manufacturer
Eaton 1 Site Transformer 0.1 kVA, 208/600 V Primary, 115 V Secondary
  • RS Stock No. 252-036
  • Mfr. Part No. 206923 UTI0,1-115
Subtotal (1 unit)
MYR855.97
MYR855.97/unit
New product - Preorder today
MEAN WELL SCWN03W8 DC/DC Converter, 15V dc/ 200 mA, 75V dc Input, 9V dc Input 3 W, Through Hole, 90 °C Max Temp -40 °C
  • RS Stock No. 765-211
  • Mfr. Part No. SCWN03W8-15
Subtotal (1 tube of 10 units)
MYR677.93
MYR677.93/tube
Stocked by manufacturer
APC 300V Input Rack UPS Power Supply, 1000 VA, SRV1KRILRK-E 900 W SRV
  • RS Stock No. 797-921
  • Mfr. Part No. SRV1KRILRK-E
Subtotal (1 unit)
MYR4,985.16
MYR4,985.16/unit
In Stock
Recom Switching Regulator, Surface, 3.3V dc Output Voltage, 500 mA Output Current, 1 Outputs
  • RS Stock No. 706-3938P
  • Mfr. Part No. R-78AA3.3-0.5SMD
Subtotal 1 unit (supplied in a tube)
MYR42.57
MYR42.57/unit
Temporarily out of stock
Murata Power Solutions Through Hole Pulse Transformer 2:1 Turns Ratio, 2000 μH Prim. Inductance, 0.6Ω Prim. Resistance
  • RS Stock No. 800-4423P
  • Mfr. Part No. 78604/1C
Subtotal 5 units (supplied in a tube)
MYR38.19
MYR7.638/unit
Temporarily out of stock
MEAN WELL Switching Power Supply, RPS-400-15-SF 15V dc, 26.7A, 250.5 W, Input 80V ac to 370 V dc, 264V ac
  • RS Stock No. 124-4670
  • Mfr. Part No. RPS-400-15-SF
Subtotal (1 unit)
MYR485.12
MYR485.12/unit
Temporarily out of stock
TRACOPOWER THM 30 DC/DC Converter, 5V, -5 V/ 3000 mA, 75V dc Input, 36V Input 30 W, Through Hole, 80 °C Max Temp -40 °C
  • RS Stock No. 165-1212
  • Mfr. Part No. THM 30-4821
Subtotal (1 tube of 10 units)
MYR4,664.86
MYR4,664.86/tube
Temporarily out of stock
Recom REC5 DC/DC Converter, 5V dc/ 1 A, 36V dc Input, 18V Input 5 W, Through Hole, 75 °C Max Temp -40 °C Min Temp,
  • RS Stock No. 166-8952
  • Mfr. Part No. REC5-2405SRW/H4/A
Subtotal (1 tube of 15 units)
MYR2,148.74
MYR2,148.74/tube
Stocked by manufacturer
Eaton 4 kVA Chassis Mount Transformer, 230 V, IEC EN, VDE, UL, CE, CSA
  • RS Stock No. 255-472
  • Mfr. Part No. 221528 STN4,0(400/230)
Subtotal (1 unit)
MYR4,605.58
MYR4,605.58/unit
Temporarily out of stock
MEAN WELL Switching Power Supply, NSP-100-5, NSP-100 Input 85V ac to 305V ac
  • RS Stock No. 765-266
  • Mfr. Part No. NSP-100-5
Subtotal (1 unit)
MYR161.95
MYR161.95/unit
Temporarily out of stock
TRACOPOWER Switching Power Supply, TMPW 5-103-J 2 Output 3.3V, 1515mA, 5 W, Input 90V ac to 305V ac
  • RS Stock No. 211-0592
  • Mfr. Part No. TMPW 5-103-J
Subtotal (1 unit)
MYR84.76
MYR84.76/unit
New product - Preorder today
TE Connectivity Transformer 10.63 : 1 Turns Ratio, 6.1 mH Prim. Inductance, 2.45Ω Prim. Resistance
  • RS Stock No. 815-139
  • Mfr. Part No. 3-1879385-5
Subtotal (1 pack of 100 units)
MYR1,279.35
MYR1,279.35/pack
Stock information currently inaccessible
TRACOPOWER TEN 5 DC/DC Converter, 5V dc/ 500 mA, 18V dc Input, 9V Input 6 W, Through Hole, 85 °C Max Temp -40 °C Min
  • RS Stock No. 293-2836P
  • Mfr. Part No. TEN 5-1221
Subtotal 1 unit (supplied in a tube)
MYR116.31
MYR116.31/unit
Stocked by manufacturer
Unifive 0.1 W Adapter AC/DC Adapter 12V dc Output, 0.37 A
  • RS Stock No. 723-872
  • Mfr. Part No. UMVUU3018-120015SA PL03B
Subtotal (1 unit)
MYR253.50
MYR253.50/unit
New product - Preorder today
MEAN WELL Switching Power Supply, NSP-320-27, NSP-320 Input 85V ac to 305V ac
  • RS Stock No. 765-227
  • Mfr. Part No. NSP-320-27
Subtotal (1 unit)
MYR236.85
MYR236.85/unit
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