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    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

    1001 Products showing for Power Supplies & Transformers

    1 of 51
    RS PRO 50VA 1 Output Chassis Mounting Transformer, 55V ac, IEC 61558-2-4
    • RS Stock No. 504-296
    Each
    HK$656.70
    RS PRO, Mounting Disc for use with Toroidal Transformer
    • RS Stock No. 671-9205
    Each (In a Pack of 10)
    HK$4.52
    RS PRO 20VA DIN Rail Transformer, 380 → 420V ac Primary, 230V ac Secondary
    • RS Stock No. 123-5698
    Each
    HK$588.01
    RS PRO, Neoprene Disc for use with Toroidal Transformer
    • RS Stock No. 671-9214
    Each (In a Pack of 10)
    HK$7.785
    RS PRO 3W Plug-In AC/DC Adapter 9V dc Output, 330mA Output
    • RS Stock No. 139-1778
    Each
    HK$140.90
    RS PRO 160VA DIN Rail Transformer, 230 → 400V ac Primary, 2 x 115V ac Secondary
    • RS Stock No. 123-4143
    Each
    HK$1,013.40
    RS PRO Switching Power Supply, 24V dc, 1.5A, 36W, 1 Output
    • RS Stock No. 161-8275
    Each
    HK$148.60
    RS PRO Modified Sine Wave 200W Power Inverter, 12V dc Input, 230V ac Output
    • RS Stock No. 816-0012
    Each
    HK$387.20
    Better World
    RS PRO 600W PC Power Supply, 100 → 240V ac Input, 3.3V, 5V, 5VSB, 12V, -12V Output
    • RS Stock No. 201-1839
    Each
    HK$492.20
    RS PRO 24W Plug-In AC/DC Adapter 12V dc Output, 2A Output
    • RS Stock No. 139-2345
    Each
    HK$181.30
    RS PRO 150VA 1 Output Chassis Mounting Transformer, 12V ac, IEC 61558-2-6
    • RS Stock No. 504-177
    Each
    HK$1,515.10
    RS PRO 12W Plug-In AC/DC Adapter 12V dc Output, 0 → 1A Output
    • RS Stock No. 125-4242
    Each
    HK$245.54
    RS PRO 230V ac, 2 x 25V ac Toroidal Transformer, 225VA 2 Output
    • RS Stock No. 671-9047
    Each
    HK$634.90
    Better World
    RS PRO 80W Polycrystalline solar panel
    • RS Stock No. 904-6140
    Each (In a Pack of 2)
    HK$1,957.90
    RS PRO Switched Mode DIN Rail Power Supply, 230V ac, 24V dc dc Output, 650mA Output, 15W
    • RS Stock No. 136-8303
    Each
    HK$95.70
    RS PRO Pure Sine Wave 2000W Fixed Installation DC-AC Power Inverter, 12V dc Input, 230V ac Output, No
    • RS Stock No. 268-5133
    Each
    HK$4,724.00
    RS PRO 2 x 115V ac, 2 x 18V Toroidal Transformer, 5VA
    • RS Stock No. 124-3853
    Each
    HK$169.18
    RS PRO 110 → 300V ac Input Stand Alone Uninterruptible Power Supply, 2000VA (1.6kW)
    • RS Stock No. 235-5101
    Each
    HK$7,110.20
    RS PRO 30W Plug-In AC/DC Adapter 12V dc Output, 2.5A Output
    • RS Stock No. 200-8939
    Each
    HK$116.30
    RS PRO 12V ac 2 Output Through Hole PCB Transformer, 6VA
    • RS Stock No. 504-353
    Each
    HK$247.70
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