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

854 Products showing for Power Supplies & Transformers

5 of 43
In Stock
RS PRO 5 to 24 V ac 2 Output Through Hole PCB Transformer, AS/NZS 61558.2.6, CE, IEC/BS/EN 61558-1, AS/NZS 61558.1,
  • RS Stock No. 504-476
Subtotal (1 unit)
$56.78(exc. GST)
Temporarily out of stock
RS PRO 2 Output 200 VA Chassis Mount Transformer, 18 V ac, ASNZS 61558..4, ASNZS 61558..6, RoHS, IECBSEN 615581, IECBSEN
  • RS Stock No. 504-032
Subtotal (1 unit)
$178.12(exc. GST)
Currently unavailable
RS PRO 2 x 115 V 2 x 22 V Toroidal Transformer, RoHS, REACH
  • RS Stock No. 124-3848
Subtotal (1 unit)
$23.86(exc. GST)
Currently unavailable
RS PRO 2 x 115 V 2 x 12 V Toroidal Transformer, REACH, RoHS
  • RS Stock No. 173-0162
Subtotal (1 box of 20 units)
$895.86(exc. GST)
Temporarily out of stock
RS PRO 1 Phase 6.72kVA Variac, 1 Output, 240V, 28A
  • RS Stock No. 890-2825
Subtotal (1 unit)
$4,054.48(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 12 V ac Toroidal Transformer 2 Output 50 VA
  • RS Stock No. 671-8956
Subtotal (1 unit)
$80.05(exc. GST)
Currently unavailable
RS PRO 2 x 115 V 2 x 22 V Toroidal Transformer 2 Output 25 VA, REACH, RoHS
  • RS Stock No. 173-0157
Subtotal (1 box of 20 units)
$810.04(exc. GST)
Temporarily out of stock
RS PRO 2 x 115 V 2 x 12 V Toroidal Transformer 2 Output 30 VA, VDE0570 Class II, IEC61558 Class II, EN61558 Class II,
  • RS Stock No. 173-0093
Subtotal (1 box of 30 units)
$1,570.50(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)
$211.88(exc. GST)
In Stock
RS PRO 1 Output 1000 VA Chassis Mount Transformer, 230 V ac, AS/NZS 61558.2.6, AS/NZS 61558.1, RoHS, IEC/BS/EN 61558-1,
  • RS Stock No. 504-123
Subtotal (1 unit)
$470.46(exc. GST)
In Stock
RS PRO 24W Plug-In AC/DC Adapter 6V dc Output, 4A Output
  • RS Stock No. 904-8483
Subtotal (1 unit)
$73.81(exc. GST)
Temporarily out of stock
RS PRO 2 x 115 V ac 2 x 55 V ac Toroidal Transformer 2 Output 50 VA, UL506, CE, AS NZS 61558.1, BS EN 61558-1, AS NZS
  • RS Stock No. 540-5242
Subtotal (1 unit)
$170.48(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 12 V ac Toroidal Transformer 2 Output 50 VA
  • RS Stock No. 173-0098
Subtotal (1 box of 24 units)
$2,436.408(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 12 V ac Toroidal Transformer 2 Output 50 VA
  • RS Stock No. 173-0169
Subtotal (1 box of 24 units)
$2,436.408(exc. GST)
Temporarily out of stock
RS PRO 5 to 24 V ac 2 Output Through Hole PCB Transformer, ASNZS 61558..6, ASNZS 61558.1, CE, RoHS, IECBSEN 615581,
  • RS Stock No. 504-470
Subtotal (1 unit)
$62.55(exc. GST)
In Stock
RS PRO 24 V ac 2 Output Through Hole PCB Transformer, IECBSEN 615581, ASNZS 61558..6, ASNZS 61558.1, RoHS, CE, IECBSEN
  • RS Stock No. 504-381
Subtotal (1 unit)
$55.07(exc. GST)
In Stock
RS PRO 24 V ac 2 Output Through Hole PCB Transformer, ASNZS 61558.1, CE, IECBSEN 615581, ASNZS 61558..6, RoHS, IECBSEN
  • RS Stock No. 504-357
Subtotal (1 unit)
$54.70(exc. GST)
Temporarily out of stock
RS PRO 230 V ac 2 x 15 V Toroidal Transformer 2 Output, Fully RoHS & REACH Compliant
  • RS Stock No. 124-3847
Subtotal (1 unit)
$33.42(exc. GST)
Limited stock
RS PRO 5 to 24 V ac 2 Output Through Hole PCB Transformer, ASNZS 61558.1, IECBSEN 615586, RoHS, CE, ASNZS 61558..6,
  • RS Stock No. 504-565
Subtotal (1 unit)
$73.51(exc. GST)
Currently unavailable
RS PRO 2 x 115 V 2 x 18 V Toroidal Transformer, RoHS, REACH
  • RS Stock No. 173-0123
Subtotal (1 box of 30 units)
$990.21(exc. GST)
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