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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

    27101 Products showing for Power Supplies & Transformers

    1 of 999+
    RS PRO 230V ac, 2 x 18V ac Toroidal Transformer, 120VA 2 Output
    • RS Stock No. 671-9003
    Each
    SGD68.60
    Nuvotem Talema 230V ac, 2 x 25V ac Toroidal Transformer, 30VA 2 Output
    • RS Stock No. 223-8566
    • Mfr. Part No. 0030P1-2-025K
    Each
    SGD74.20
    MEAN WELL Switching Power Supply, HRP-300-12, 14V dc, 27A, 324W, 1 Output, 264V ac Input Voltage
    • RS Stock No. 283-7470
    • Mfr. Part No. HRP-300-12
    Each
    SGD123.46
    MEAN WELL Switching Power Supply, LRS-100-24, 24V dc, 4.5A, 108W, 1 Output, 120 → 373 V dc, 85 → 264 V ac
    • RS Stock No. 106-5846
    • Mfr. Part No. LRS-100-24
    Each
    SGD25.79
    Phoenix Contact QUINT POWER Switched Mode DIN Rail Power Supply, 230V ac ac Input, 24V dc dc Output, 10A Output, 240W
    • RS Stock No. 123-4306
    • Mfr. Part No. 2904601
    Each
    SGD454.65
    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
    SGD11.71
    Nuvotem Talema 115 V ac, 230 V ac, 2 x 55V ac Toroidal Transformer, 1000VA 2 Output
    • RS Stock No. 420-9368
    • Mfr. Part No. 92450-P2S2
    Each
    SGD480.45
    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
    SGD37.99
    TRACOPOWER Switching Power Supply, TML 40215, ±15V dc, 1.333A, 40W, Dual Output, 100 → 375 V dc, 90 → 264
    • RS Stock No. 706-6114
    • Mfr. Part No. TML 40215
    Each
    SGD128.69
    TRACOPOWER Switching Power Supply, TMP 30124, 24V dc, 1.25A, 30W, 1 Output, 120 → 370 V dc, 85 → 264 V ac
    • RS Stock No. 664-1424
    • Mfr. Part No. TMP 30124
    Each
    SGD88.96
    Eaton 184 → 264V Input UPS, 1200VA (750W), EL1200USBFR
    • RS Stock No. 287-7595
    • Mfr. Part No. EL1200USBFR Eaton Ellipse ECO 1200 USB FR
    Each
    SGD546.23
    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
    MEAN WELL 12W Plug In Power Supply 12V dc Output, 1A Output
    • RS Stock No. 721-2070
    • Mfr. Part No. GS12E12-P1I
    Each
    SGD18.06
    Phoenix Contact QUINT POWER Switch Mode DIN Rail Power Supply, 85 → 264V ac ac Input, 24V dc dc Output, 2.5A
    • RS Stock No. 505-5487
    • Mfr. Part No. 2938578
    Each
    SGD314.97
    StarTech.com Plug-In AC/DC Adapter 5V dc Output, 1.2 → 2.4A Output
    • RS Stock No. 280-4796
    • Mfr. Part No. USB2PACWH
    Each
    SGD56.33
    RS PRO 1 Phase 3.6kVA Variac, 1 Output, 240V, 15A
    • RS Stock No. 890-2812
    Each
    SGD1,352.93
    TRACOPOWER TEN 12 DC-DC Converter, 5V dc/ 2A Output, 18 → 75 V dc Input, 12W, Through Hole, +85°C Max Temp -40°C
    • RS Stock No. 396-5348
    • Mfr. Part No. TEN 12-4811
    Each
    SGD87.94
    APC 180 → 266V Input Stand Alone Uninterruptible Power Supply, 650VA (400W), Back-UPS CS
    • RS Stock No. 689-9073
    • Mfr. Part No. BK650EI
    Each
    SGD478.57
    TDK-Lambda Switching Power Supply, HWS1000-24, 24V dc, 44A, 1kW, 1 Output, 120 → 330 V dc, 85 → 265 V ac
    • RS Stock No. 680-2874
    • Mfr. Part No. HWS1000-24
    Each
    SGD1,925.99
    MEAN WELL HDR Switched Mode DIN Rail Power Supply, 85 → 264 V ac, 120 → 370V dc, 24V dc dc Output, 1.5A
    • RS Stock No. 145-7868
    • Mfr. Part No. HDR-30-24
    Each
    SGD29.54
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