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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

    26672 Products showing for Power Supplies & Transformers

    1 of 999+
    MEAN WELL Pure Sine Wave 400W Power Inverter, 48V dc Input, 200 220 230 240V ac Output
    • RS Stock No. 149-602
    • Mfr. Part No. NTS-400P-248
    Each
    SGD143.38
    Weidmüller PRO BAS DIN Rail Power Supply, 264V ac ac, dc Input, 12V dc dc Output, 10A Output, 120W
    • RS Stock No. 287-5316
    • Mfr. Part No. 2838450000
    Each
    SGD134.07
    MEAN WELL DDR-120 DC-DC Converter, 24V dc/ 5A Output, 16.8 → 33.6 V dc Input, 120W, DIN Rail Mount, +70°C Max
    • RS Stock No. 175-7782
    • Mfr. Part No. DDR-120B-24
    Each
    SGD107.01
    Better World
    MEAN WELL 60W Power Brick AC/DC Adapter 24V dc Output, 2.5A Output
    • RS Stock No. 880-8414
    • Mfr. Part No. GST60A24-P1J
    Each
    SGD27.78
    MEAN WELL Switching Power Supply, IRM-30-24ST, 24V dc, 1.3A, 31W, 1 Output, 85 → 264V ac Input Voltage
    • RS Stock No. 135-8953
    • Mfr. Part No. IRM-30-24ST
    Each
    SGD22.79
    MEAN WELL Switching Power Supply, RSP-1000-48, 48V dc, 21A, 1kW, 1 Output, 127 → 370 V dc, 90 → 264 V ac
    • RS Stock No. 150-966
    • Mfr. Part No. RSP-1000-48
    Each
    SGD409.60
    MEAN WELL Switching Power Supply, EPP-200-12, 12V dc, 9.4A, 140W, 1 Output, 113 → 370 V dc, 80 → 264 V ac
    • RS Stock No. 124-4642
    • Mfr. Part No. EPP-200-12
    Each
    SGD68.54
    RS PRO 3 Phase 8.14kVA Variac, 3 Output, 415V, 10A
    • RS Stock No. 890-2850
    Each
    SGD3,433.01
    Better World
    Seeit 30W Monocrystalline Photovoltaic Solar Panel
    • RS Stock No. 265-1102
    • Mfr. Part No. KES12V-30W-M1
    Each
    SGD221.63
    MEAN WELL Switching Power Supply, DPU-3200-24, 24V dc, 133A, 3.192kW, 1 Output, 127 → 370 V dc, 90 → 264
    • RS Stock No. 176-3467
    • Mfr. Part No. DPU-3200-24
    Each
    SGD1,013.20
    Murata Power Solutions MGJ2 DC-DC Converter, -5V dc/ 40mA Output, 21.6 → 26.4 V dc Input, 2W, Through Hole,
    • RS Stock No. 816-3534
    • Mfr. Part No. MGJ2D242005SC
    Each
    SGD12.05
    RS PRO 24W Plug-In AC/DC Adapter 24V dc Output, 1A Output
    • RS Stock No. 175-3325
    Each
    SGD21.85
    TDK-Lambda DRL-10 Switched Mode DIN Rail Power Supply, 85 → 264V ac ac Input, 24V dc dc Output, 420mA Output, 10W
    • RS Stock No. 137-0854
    • Mfr. Part No. DRL10-24-1
    Each
    SGD32.36
    Murata Power Solutions NTE DC-DC Converter, 5V dc/ 200mA Output, 4.5 → 5.5 V dc Input, 1W, Surface Mount, +85°C
    • RS Stock No. 689-5472
    • Mfr. Part No. NTE0505MC
    Each
    SGD11.37
    PULS Redundancy module, DIMENSION Series
    • RS Stock No. 753-1983
    • Mfr. Part No. YRM2.DIODE
    Each
    SGD194.85
    MEAN WELL MDR Switched Mode DIN Rail Power Supply, 85 → 264V ac ac Input, 12V dc dc Output, 3.33A Output, 40W
    • RS Stock No. 428-423
    • Mfr. Part No. MDR-40-12
    Each
    SGD33.29
    MEAN WELL EDR Switched Mode DIN Rail Power Supply, 90 → 264V ac ac Input, 24V dc dc Output, 5A Output, 120W
    • RS Stock No. 122-2208
    • Mfr. Part No. EDR-120-24
    Each
    SGD42.37
    Better World
    RS PRO 850W PC Power Supply, 100 → 240V ac Input, 5 → 12V dc Output
    • RS Stock No. 242-0548
    Each
    SGD253.70
    TDK-Lambda Power Line Filter, for use with Single Phase Power Supply
    • RS Stock No. 135-7197
    • Mfr. Part No. RSEN-2020
    Each
    SGD33.01
    RS PRO 150VA 2 Output Chassis Mounting Transformer, 12V ac, IEC 61558-2-6
    • RS Stock No. 504-127
    Each
    SGD144.60
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