MEAN WELL MDR-100-48 is a single-output industrial DIN rail AC/DC power supply rated at 48 V DC, 2 A and 96 W. It combines universal input, power-factor correction, an adjustable output and a DC OK relay contact. Apply the input-voltage and vertical-mounting temperature curves when selecting the load.
Product Datasheet
Download MEAN WELL MDR-100 Datasheet (PDF)
The MDR-100 section is on PDF pages 9, 10. Refer to the complete mechanical drawings and notes when planning installation.
Model Identification
| Complete model |
MDR-100-48 |
| MDR-100 |
Industrial DIN rail power-supply family; the individual output ratings are shown below. |
| 48 output code |
48 V nominal DC output. |
| Construction features |
Free-air convection cooling; ZCS/ZVS technology to reduce power dissipation; power-on LED and DC voltage adjustment. |
DC Output
| Nominal voltage |
48 V DC. |
| Rated current |
2 A. |
| Current range |
0–2 A. |
| Rated output power |
96 W. |
| Output-voltage adjustment |
48–56 V DC, using +V ADJ. |
| Ripple and noise, maximum |
200 mVp-p. |
| Voltage tolerance |
±1.0%, including setup tolerance, line regulation and load regulation. |
| Line / load regulation |
±1.0% / ±1.0%. |
| Efficiency, typical |
87% under the catalogue’s default test conditions. |
Observe the rated current and rated power while adjusting output voltage. Ripple and noise are measured with 20 MHz bandwidth, a 12-inch twisted pair and 0.1 µF plus 47 µF parallel capacitors at the termination.
Input, Power Factor and Starting
| AC input |
85–264 VAC, universal full range. |
| DC input |
120–370 VDC. |
| Input frequency |
47–63 Hz. |
| Power factor, typical |
PF ≥0.95 at 230 VAC; PF ≥0.98 at 115 VAC, at full load. The block diagram shows the PFC circuit and control. |
| AC input current, typical |
1.3 A at 115 VAC; 0.8 A at 230 VAC. |
| Cold-start inrush, typical |
30 A at 115 VAC; 60 A at 230 VAC. |
| Setup / rise time |
3000 ms / 50 ms at either 230 VAC or 115 VAC, at full load. |
| Hold-up time, typical |
50 ms at 230 VAC; 20 ms at 115 VAC, at full load. |
| No-load consumption |
Less than 1 W. |
| Leakage current |
Less than 1 mA at 240 VAC. |
Setup time is measured at the first cold start; switching the supply off and on again may increase setup time. Low input voltage can require load derating.
Protection and DC OK Relay
| Short circuit / overload |
Overload threshold: 105–150% of rated output power. Constant-current limiting; automatic recovery after the fault is removed. |
| Overvoltage |
57.6–64.8 V. Output shuts down; re-power to recover. |
| Overtemperature |
Output shuts down; automatic recovery or re-power to recover, as specified by the catalogue. |
| DC OK contact closed |
Power supply on / DC OK. |
| DC OK contact open |
Power supply off / DC fail. |
| Contact rating, maximum |
30 V / 1 A with a resistive load. |
Use the dedicated two-terminal relay contact for status monitoring; it is separate from the DC output terminals. The catalogue does not specify a logic-output voltage or an exact trip threshold for this relay.
Cooling, Derating and Environment
| Cooling / operating range |
Free-air convection; -10 to +60°C, subject to the derating curve. |
| Vertical temperature curve |
100% load from -10°C to 40°C; reduce along the plotted line to 60% at 60°C. The upper temperature limit is not a full-load rating. |
| Input-voltage curve, 60 Hz |
80% load at 85 VAC, rising to 100% at 100 VAC; 100% continues through 264 VAC. |
| Working humidity |
20–90% RH, non-condensing. |
| Storage |
-40 to +85°C; 10–95% RH. |
| Temperature coefficient |
±0.03%/°C over 0–50°C. |
| Vibration |
Component: 10–500 Hz, 2 G; 10 minutes per cycle and 60 minutes along each X, Y and Z axis. Mounting complies with IEC60068-2-6. |
| Altitude derating note |
For this fanless supply, the catalogue specifies an ambient-temperature reduction of 3.5°C per additional 1000 m above 2000 m (6500 ft). |
Temperature and input-voltage limits apply together. Follow the complete plotted curves for intermediate operating points and maintain the natural-convection path.
Dimensions, Wiring and Mounting
| Dimensions |
55 × 90 × 100 mm (W × H × D); case 973A, mechanical drawing tolerance ±1 mm. |
| DIN rail |
TS-35/7.5 or TS-35/15; the drawing shows a 35 mm rail profile. |
| Upper terminals, viewed from the front |
Left to right: +V, +V, -V, -V, then the two DC OK relay-contact terminals. Follow the engraved labels and complete drawing. |
| Lower terminals, viewed from the front |
Left to right: FG protective earth, N, L. |
| Terminal drawing spacings |
Upper row: 5 mm between adjacent terminal centers; lower row: 7.5 mm between adjacent terminal centers. |
| Indication / adjustment |
The front drawing identifies the DC OK LED and +V ADJ control. Use only this model’s stated voltage-adjustment range. |
| Installation orientation |
Use the vertical orientation associated with the derating curve; connect the indicated FG protective-earth terminal. |
The catalogue identifies the compatible DIN rail profiles but does not list a separate mounting-kit, terminal-kit or connector ordering code, or state that a rail is included. Consult the manufacturer installation instructions for the final installation.
Safety, Insulation and EMC
| Catalogue-listed safety approvals |
UL508; TUV BS EN/EN62368-1; EAC TP TC004; BSMI CNS15598-1; AS/NZS60950.1. |
| Withstand voltage |
Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC. |
| Insulation resistance |
More than 100 MΩ for input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH. |
| EMC emissions |
BS EN/EN55032 (CISPR32); BS EN/EN61204-3 Class B; BS EN/EN61000-3-2 and -3; EAC TP TC020; CNS15936 Class B. |
| EMC immunity |
BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2; BS EN/EN61204-3, heavy-industry level; EAC TP TC020. |
The catalogue excludes the 48 V model from its BIS IS13252 listing.
This power supply is a component for installation in final equipment. Reconfirm that the completed equipment complies with the applicable EMC directives.
Weight, Reliability and Reference Conditions
| Catalogue unit weight |
420 g: 0.42 kg explicitly listed in PACKING as a catalogue packing reference per unit, not a measured net weight or a shipment weight. |
| MTBF |
2217.8 K hours minimum, Telcordia SR-332 (Bellcore); 346.5 K hours minimum, MIL-HDBK-217F at 25°C. These are reliability references, not guaranteed service life. |
| Manufacturer test / warranty statement |
The catalogue lists a 100% full-load burn-in test and a three-year warranty, subject to the applicable manufacturer terms. |
| Default measurement conditions |
Unless otherwise specified: 230 VAC input, rated load and 25°C ambient temperature. |
| Applicable datasheet |
MDR-100-SPEC, 2025-12-12; combined MDR catalogue pages 9–10. |
