PC Power Supplies

PC power supplies, also known as computer power supplies, are pieces of hardware which convert high-power mains electricity into usable DC power, for the components within your desktop computer. They convert AC (alternating current) from the mains to low-voltage, regulated DC (direct current).

Why use a PC power supply?

Power supply units (PSUs) are an essential piece of hardware within a computer as they supply power to all the components within your PC, such as the motherboard or graphics card. Typical PSU voltages are 3.3V, 5V and 12V.

PSUs are there to prevent spikes in the voltage supply and for surge protection.

Where are they installed?

You will find these power supplies in the back of a desktop computer. It is an internal hardware component.

Computer power supplies feature a power cable connector on one side and multiple wires on the other. These wires connect to various devices within the computer to supply power to them, for example, motherboards and hard drives. Computer power supplies also have a cooling fan which expels air out the back of a computer. They also prevent overheating through voltage control. There is usually a power switch at the back and another switch to alter the voltage.

How important is overall wattage?

It is important that you computer PSU covers the necessary wattage that your system requires. You can work this out by roughly adding up the consumption of all your parts. It is best to have an oversized PSU as it will cover your current wattage requirements, with room for extra if you decide to upgrade any of your components.

What is an ATX PSU?

ATX is a specification for motherboards which many PC power supplies meet. This means that the computer PSU fits into an ATX standard case and works alongside an ATX motherboard within the PC. An ATX power supply would be suitable for use in a modular computer as it has a standard case size.


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Description Price Input Voltage Output Voltage Power Rating Output Current Number of Outputs Length Width Depth Mounting Type Efficiency Load Regulation Line Regulation Holdup Time Input Frequency Range
RS Stock No. 666-7012
Mfr. Part No.SS-400H1U APFC F0 80+
BrandSeasonic
HK$990.02
Each
units
90 → 264V ac ±12 V dc, 3.3 V dc, 5 V dc 400W 3 A, 20 A, 21 A, 29 A, 800 mA 5 235mm 100mm 40mm Rack Mount 80% ±5% ±1% - -
RS Stock No. 177-797
Mfr. Part No.SS-500ES APFC F3
BrandSeasonic
HK$812.35
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 500W 17 A, 24 A, 825 mA 6 150mm 140mm 86mm Panel Mount 80% ±5% ±1% - -
RS Stock No. 177-775
Mfr. Part No.SS-400ES APFC F3
BrandSeasonic
HK$658.72
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 400W 2.5 A, 17 A, 20 A, 800 mA 6 150mm 140mm 86mm Panel Mount 80% ±5% ±1% - -
RS Stock No. 177-769
Mfr. Part No.SS-350ES APFC F3
BrandSeasonic
HK$657.47
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 350W 2.5 A, 17 A, 20 A, 800 mA 6 150mm 140mm 86mm Panel Mount 80% ±5% ±1% - -
RS Stock No. 781-7186
Mfr. Part No.1RT45GFS01B10W
BrandSeasonic
HK$1,014.06
Each
units
220V -12 V, 3.3 V, 5 V, 12 V 450W 2.5 A, 20 A, 47 A, 300 mA 5 150mm 140mm 86mm Panel Mount 90% ±5% ±1% - -
RS Stock No. 754-2413
Mfr. Part No.SS-500L1U Active PFC
BrandSeasonic
HK$1,319.26
Each
units
100 → 240V ac -12 V, 3.3 V, 5 V, 5 Vsb, 12 (Combined) V 500W 2.5 A, 20 A, 40 A, 300 mA 1 235mm 100mm 40mm Rack Mount >87% ±5% ±1% - -
RS Stock No. 708-2144
Mfr. Part No.SS-600ES APFC F3
BrandSeasonic
HK$954.21
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 600W 2.5 A, 24 A, 46 A, 800 mA 5 150mm 140mm 86mm Panel Mount 82% ±5% ±1% - -
RS Stock No. 177-810
Mfr. Part No.SS-300ES APFC F3
BrandSeasonic
HK$488.37
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 300W 2.5 A, 17 A, 18 A, 20 A, 800 mA 6 150mm 140mm 86mm Panel Mount 80% ±5% ±1% - -
RS Stock No. 666-7025
Mfr. Part No.SS-400H2U APFC F0 80+
BrandSeasonic
HK$1,031.43
Each
units
90 → 264V ac ±12 V dc, 3.3 V dc, 5 V dc 400W 3 A, 20 A, 21 A, 29 A, 800 mA 5 225mm 100mm 70mm Rack Mount 80% ±5% ±1% - -
RS Stock No. 666-7000
Mfr. Part No.SS-650HT APFC F3
BrandSeasonic
HK$1,256.52
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 650W 3 A, 18 A, 24 A, 30 A, 800 mA 8 150mm 140mm 86mm Panel Mount 80% ±5% ±1% - -
RS Stock No. 136-6053
Mfr. Part No.SSP-300SUB
BrandSeasonic
HK$399.44
Each
units
100 → 240V dc -12 V dc, 3.3 V dc, 5 V dc, 12 V dc 300W 2 A, 14 A, 17 A, 18 A, 800 mA 6 150mm 81.5mm 40.5mm - - ±5% ±1% - 47 → 63Hz
RS Stock No. 666-7028
Mfr. Part No.SS-600H2U APFC F0 80+
BrandSeasonic
HK$1,676.76
Each
units
90 → 264V ac ±12 V dc, 3.3 V dc, 5 V dc 600W 3 A, 15 A, 17 A, 20 A, 25 A, 800 mA 7 270mm 100mm 70mm Rack Mount 80% ±5% ±1% - -
RS Stock No. 136-9005
Mfr. Part No.SSPSUPRIME750WPLAT
BrandSeasonic
HK$2,325.78
Each
units
100 → 240V ac -12 V dc, 3.3 V dc, 5 V dc, 5 VSB V dc, 12 V dc 750W 2.5 A, 20 A, 62 A, 300 mA 5 170mm 86mm 150mm Panel Mount 89% 0.5% - - 50 → 60Hz
RS Stock No. 704-3281
Mfr. Part No.GSM20-PSU
HK$252.60
Each
units
250V ac 12 V 12W - 1 88mm 60mm 26mm Stand Alone - - - - 50/60Hz
RS Stock No. 136-6054
Mfr. Part No.SSP-300TBS
BrandSeasonic
HK$346.62
Each
units
100 → 240V dc -12 V dc, 3.3 V dc, 5 V dc, 12 V dc 300W 2 A, 14 A, 17 A, 18 A, 20 A, 800 mA 6 85mm 140mm 65mm - - ±5% ±1% - 47 → 63Hz
RS Stock No. 181-2083
Mfr. Part No.SSR-550PX
BrandSeasonic
HK$1,369.14
Each
units
100 → 240V dc -15 V dc, 3.3 V dc, 5 V dc, 5 VSB V dc, 12 V dc 550W 3 A, 20 A, 45 A, 300 mA 5 140mm 150mm 86mm Panel Mount 92% - - - 50 → 60Hz
RS Stock No. 136-9003
Mfr. Part No.SSPSUPRIME750W
BrandSeasonic
HK$2,867.66
Each
units
100 → 240V ac -12 V dc, 3.3 V dc, 5 V dc, 5 VSB V dc, 12 V dc 750W 3 A, 20 A, 62 A, 300 mA 5 170mm 86mm 150mm Panel Mount 94% 0.5% - - 50 → 60Hz
RS Stock No. 708-2147
Mfr. Part No.SS-600ET APFC F3
BrandSeasonic
HK$961.30
Each
units
220V ac ±12 V dc, 3.3 V dc, 5 V dc 600W 2.5 A, 24 A, 46 A, 800 mA 5 150mm 140mm 86mm Panel Mount 82% ±5% ±1% - -
RS Stock No. 754-2419
Mfr. Part No.SS-400L1U Active PFC
BrandSeasonic
HK$1,127.53
Each
units
100 → 240V ac -12 V, 3.3 V, 5 V, 5 Vsb, 12 (Combined) V 400W 2.5 A, 20 A, 32 A, 300 mA 1 235mm 100mm 40mm Rack Mount >87% ±5% ±1% - -
RS Stock No. 103-3921
Mfr. Part No.SSP-350ST
BrandSeasonic
HK$606.78
Each
units
100 → 240V ac ±12 V dc, 3.3 V dc, 5 V dc 350W 0.3 → 27A 5 150mm 140mm 86mm Panel Mount ≥82% ±5% ±1% - 50/60Hz
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