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Switching Power Supply 25 W 12 V DC – MEAN WELL S-25-12
The S-25-12 is a single output switching power supply 25 W / 12 V DC (“Single Output Switching Power Supply”) manufactured by MEAN WELL. It belongs to the S-25 series, featuring a universal AC input of 85–264 V AC (or 120–370 V DC) and a regulated output of 12 V DC / 2.1 A. It is documented as a component in CNC control cabinets, industrial automation systems, and electronic equipment in general. The unit is fanless (natural convection cooling) and compliant with CE/UL standards. The output voltage is adjustable via an onboard trimmer in the 10–13 V range; no significant revision variants exist in the standard version.
The S-25-12 provides the regulated 12 V DC auxiliary supply required to power logic boards, relays, transducers, displays, and other subsystems inside the CNC control cabinet. A failure results in loss of voltage across all 12 V circuits: the machine stops, drives lose their auxiliary supply, and the CNC cannot complete the enable sequence. In many control cabinets it is a critical, non-redundant component.
MEAN WELL is a Taiwanese switching power supply manufacturer founded in 1982, now one of the world’s leading suppliers with over 10,000 catalog models and worldwide distribution. The S-25 series is actively produced and widely available from major global electronics distributors.
Main Technical Specifications
| Type | Single output switching power supply (Single Output SMPS) |
| Part number | S-25-12 (S2512) |
| Brand | MEAN WELL |
| Known application | CNC control cabinets, industrial automation, electronic equipment |
| Function | Regulated 12 V DC auxiliary supply for logic and control circuits |
| Input voltage | 85–264 V AC / 120–370 V DC (universal) |
| Output voltage | 12 V DC (adjustable 10–13 V via trimmer) |
| Output current | 2.1 A nominal |
| Output power | 25.2 W |
| Efficiency | ~78% (typical at full load) |
| Protections | Over-current, over-voltage, short-circuit |
| Cooling | Natural convection (fanless) |
| Interfaces / connectors | Screw terminal blocks on AC input and DC output side |
| Weight | ~0.2 kg |
| Dimensions | 99 × 82 × 30 mm |
| Production status | Active production — available from stock |
Switching Power Supply 25 W / 12 V DC – MEAN WELL PS-25-12
The PS-25-12 is a single-output enclosed switching power supply (“Single Output Switching Power Supply”) rated at 25 W, manufactured by MEAN WELL, with a regulated output of 12 V DC / 2.1 A and universal input 85–264 V AC. It belongs to MEAN WELL’s PS series, designed for industrial applications, CNC control panels, machine tools and automation systems. The internal part number is PS2512. There are no output-voltage variants under this part number: the trailing “12” uniquely identifies the 12 V output version.
The power supply delivers the regulated 12 V DC voltage to logic circuits, relays, sensors and control boards inside the CNC machine’s electrical cabinet. A power supply failure immediately disables all 12 V-powered subsystems: the machine loses control over I/O, safety interlocks and internal communications, making any machining operation impossible until the unit is replaced.
MEAN WELL is a Taiwanese manufacturer founded in 1982 and a world leader in standard switching power supplies. With over 10,000 models in its catalogue, its products are used in industrial automation, machine tools, LED lighting and distributed control systems. The PS series is legacy / discontinued: it has been superseded by newer series (RS, MDR, HDR), but remains widely available as used or surplus stock.
Main Technical Specifications
| Type | Single-output enclosed switching power supply |
| Part number | PS-25-12 (PS2512) |
| Brand | MEAN WELL |
| Known application | CNC panels, machine tools, industrial automation, electrical control cabinets |
| Function | Regulated 12 V DC supply for logic circuits, relays, sensors and control boards |
| Input voltage | 85–264 V AC / 120–373 V DC (universal input) |
| Output voltage | 12 V DC (±2%) |
| Output current | 2.1 A max |
| Output power | 25 W |
| Efficiency | ~77% |
| Protections | Short circuit, overload, overvoltage |
| Interfaces / connectors | Screw terminals (AC input, DC output); free-standing or panel mount |
| Weight | ~0.27 kg |
| Dimensions | 99 × 82 × 36 mm (L × W × H) |
| Production status | Legacy / discontinued — available as used, surplus or replacement with RS / MDR / HDR series |