MEAN WELL LRS-100-12 is a single-output enclosed switching power supply with a 12 V DC output, 8.5 A rated current and 102 W rated output power. Universal AC input / full range. Free-air convection; no fan.
Download MEAN WELL LRS-100 Datasheet (PDF)
The combined LRS catalog includes this series on PDF pages 13–16. Specifications: page 14; mechanical drawing: page 16.
Model and Output Specifications
| Complete model |
LRS-100-12 |
| Series |
LRS-100 |
| Output-voltage code |
12 = 12 V DC nominal output |
| Rated output voltage |
12 V DC |
| Rated output current |
8.5 A |
| Output current range |
0 to 8.5 A |
| Rated output power |
102 W |
| Output voltage adjustment |
10.2 to 13.8 V |
| Ripple and noise, maximum |
120 mVp-p |
| Voltage tolerance |
±1.0% |
| Line regulation |
±0.5% |
| Load regulation |
±0.5% |
| Efficiency, typical |
88% at the stated test conditions |
230 VAC input, rated load, 25°C ambient unless otherwise stated. Ripple/noise test: 20 MHz bandwidth; 12-inch twisted-pair wire terminated with 0.1 µF and 47 µF parallel capacitors.
Voltage tolerance includes setup tolerance, line regulation and load regulation. Line regulation is measured from low to high input at rated load; load regulation is measured from 0% to 100% rated load.
Input and Timing
| AC input range |
85 to 264 VAC |
| Input range selection |
Universal AC input / full range |
| DC input range |
120 to 373 VDC |
| Input frequency |
47 to 63 Hz |
| AC input current, typical |
1.9A/115VAC 1.2A/230VAC |
| Inrush current, typical |
Cold start 50A/230VAC |
| Leakage current |
<0.75mA / 240VAC |
| Setup / rise time |
500 / 30 ms at 230 VAC; 500 / 30 ms at 115 VAC, full load |
| Hold-up time, typical |
55 ms at 230 VAC; 10 ms at 115 VAC, full load |
| Transient input withstand |
300 VAC for 5 seconds; this is a surge condition, not the continuous input rating |
Full load; setup at cold first start. Rapid on/off cycling can increase setup time.
Protection and Recovery
| Short-circuit protection |
Included |
| Overload |
110 to 150% of rated output power. Hiccup; automatically recovers after fault condition is removed. |
| Overvoltage protection |
13.8 to 16.2 V. Shut down output; re-power on to recover. |
Environment and Cooling
| Ambient operating temperature |
-30 to 70 °C; apply the temperature and input-voltage derating curves |
| Cooling |
Free-air convection; no fan |
| Working humidity |
20 ~ 90% RH non-condensing |
| Storage temperature / humidity |
-40 ~ +85°C, 10 ~ 95% RH non-condensing |
| Temperature coefficient |
±0.03%/°C (0 ~ 50°C) |
| Operating altitude |
Up to 5,000 m as stated for this series; the applicable overvoltage category and temperature derating impose additional limits. |
| Overvoltage category |
Category III up to 2,000 m under the standards specified in this series datasheet. This is an insulation category, separate from the output-overvoltage protection threshold. |
| Higher-altitude temperature derating |
For operation above 2,000 m, reduce the permitted ambient temperature by 5 °C per additional 1,000 m. Verify the applicable insulation/approval limits for the installation. |
Full rated output is not available at every point within the temperature and input ranges. Use the ambient-temperature and static input-voltage curves on PDF page 15 for this model and installation orientation.
Dimensions and Installation
| Overall dimensions (L × W × H) |
129 × 97 × 30 mm |
| Case number |
238A |
| Drawing tolerance |
±1 mm |
| Mounting-hole callouts |
2-M3 L=3.0; 3-M3 L=5 |
| Terminal 1 |
AC/L |
| Terminal 2 |
AC/N |
| Terminal 3 |
FG (protective earth) |
| Terminal 4,5 |
DC OUTPUT -V |
| Terminal 6,7 |
DC OUTPUT +V |
Use the mechanical drawing on PDF page 16 to locate the holes and confirm the permitted screw penetration for the selected mounting face. The M3/M4 callouts are mounting dimensions, not accessory ordering codes. Match wiring, protective-earth connection and output polarity to the terminal markings. Keep ventilation openings clear for convection cooling.
This enclosed supply is a component for installation inside final equipment. Complete installation and electrical work using the manufacturer’s installation instructions and the applicable equipment requirements.
Reference Weight
| Catalog reference per unit |
330 g |
This value is the per-unit reference in the manufacturer’s PACKING row. It is not a measured net weight or a quotation for the complete shipping package.
Application and Datasheet Notes
EMC results are for a component installed on the manufacturer’s specified test plate. The finished equipment must be checked again for EMC compliance. Safety approvals and regional exceptions depend on the exact model and datasheet revision; refer to the linked specification and applicable certificates when selecting the unit.
Additional Manufacturer Data
| Vibration test |
10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes |
| MTBF reference |
3348.9K hrs min. Telcordia SR-332 (Bellcore) ; 677.4Khrs min. MIL-HDBK-217F (25°C) |
| Dielectric withstand |
I/P-O/P:4KVAC I/P-FG:2KVAC O/P-FG:1.25KVAC |
| Power indication |
LED power-on indicator |
| Manufacturer datasheet warranty |
3 years; subject to the manufacturer’s applicable warranty terms |
MTBF is a reliability prediction under the stated method and conditions, not a service-life or warranty-duration guarantee.
Source: MEAN WELL LRS-100 datasheet, revision 2025-04-07, in the linked LRS catalog. Use the exact model specification, notes and drawings together when selecting and installing this supply.
