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

851 Products showing for Power Supplies & Transformers

11 of 43
In Stock
RS PRO 56YSD60L Power Supply DIN Rail Power Supply 264V ac AC Input 24V dc, 1.7 A Output DC 60 W
  • RS Stock No. 284-0486
Subtotal (1 unit)
$130.94(exc. GST)
Currently unavailable
RS PRO 230 V ac 2 x 30 V ac Toroidal Transformer 2 Output 500 VA, UL 506, EN 60065, UL 5085-1, EN 61558-1
  • RS Stock No. 123-4032
Subtotal (1 unit)
$364.58(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 15 V ac Toroidal Transformer 2 Output 225 VA, UL 506, IEC 61558 Class II, RoHS, VDE0570 Class II, EN
  • RS Stock No. 671-9176
Subtotal (1 unit)
$215.83(exc. GST)
In Stock
RS PRO 2500 VA DIN Rail Transformer, 400 V ac Primary, 12 V ac Secondary, AS/NZS 61558.1, RoHS, IEC/BS/EN 61558-1,
  • RS Stock No. 123-4144
Subtotal (1 unit)
$407.79(exc. GST)
In Stock
RS PRO Switch Mode Power Supply DIN Rail Power Supply 264V ac AC Input 12.3V dc, 2.5 A Output DC 30 W
  • RS Stock No. 136-8305
Subtotal (1 unit)
$67.46(exc. GST)
In Stock
RS PRO Embedded Switch Mode Power Supply 2 Output 12V dc, 12.5 A, 120 W, Input 85V ac to 264V ac
  • RS Stock No. 262-9102
Subtotal (1 unit)
$110.44(exc. GST)
Currently unavailable
RS PRO 2 x 115 V ac 2 x 12 V Toroidal Transformer, REACH, RoHS
  • RS Stock No. 124-3875
Subtotal (1 unit)
$53.88(exc. GST)
In Stock
RS PRO 800 VA DIN Rail Transformer, 230 to 400 V ac Primary, 4 x 0-55-60 V ac Secondary, AS/NZS 61558.1, RoHS, CE,
  • RS Stock No. 123-5702
Subtotal (1 unit)
$424.34(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 12 V ac Toroidal Transformer 2 Output 80 VA
  • RS Stock No. 173-0186
Subtotal (1 box of 16 units)
$1,323.968(exc. GST)
Currently unavailable
RS PRO 2 x 115 V ac 2 x 7 V Toroidal Transformer, REACH, RoHS
  • RS Stock No. 124-3873
Subtotal (1 unit)
$53.35(exc. GST)
Limited stock
Better World
RS PRO Surface 20 W Monocrystalline Cable Solar Panel
  • RS Stock No. 904-6125
Subtotal (1 pack of 5 units)
$968.04(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 12 V ac Toroidal Transformer 2 Output 80 VA
  • RS Stock No. 173-0129
Subtotal (1 box of 16 units)
$1,294.528(exc. GST)
In Stock
RS PRO 16 VA DIN Rail Transformer, 230 V ac Primary, 12 V ac Secondary, EN 61558-2-6, RoHS
  • RS Stock No. 772-0704
Subtotal (1 unit)
$237.71(exc. GST)
In Stock
RS PRO Switching Power Supply 48V dc, Input 85V ac to 240V ac
  • RS Stock No. 161-8226
Subtotal (1 unit)
$315.78(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 9 V ac Toroidal Transformer 2 Output 80 VA, EN 61558 Class II, RoHS, IEC 61558 Class II, UL 506,
  • RS Stock No. 173-0185
Subtotal (1 box of 16 units)
$1,221.824(exc. GST)
Temporarily out of stock
RS PRO 2 x 12 V ac 2 Output PCB PCB Transformer, UKCA, CE, RoHS 10 VA
  • RS Stock No. 121-3849
Subtotal (1 unit)
$24.15(exc. GST)
In Stock
RS PRO 150W Power Inverter, 12 V dc Input, 230 V ac Output
  • RS Stock No. 816-0015
Subtotal (1 unit)
$114.71(exc. GST)
In Stock
RS PRO 2500 VA DIN Rail Transformer, 400 V ac Primary, 2 x 12 V ac Secondary, RoHS, ASNZS 61558.1, CE, IECBSEN 615586 or
  • RS Stock No. 123-5697
Subtotal (1 unit)
$267.92(exc. GST)
Currently unavailable
RS PRO 2 x 115 V ac 2 x 18 V Toroidal Transformer 2 Output, RoHS, REACH
  • RS Stock No. 124-3871
Subtotal (1 unit)
$55.92(exc. GST)
In Stock
RS PRO Car Charger Plug-In 16V dc 19 V dc, 4.7 A
  • RS Stock No. 417-916
Subtotal (1 unit)
$195.29(exc. GST)
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