MEAN WELL SDR-75-48 is a single-output industrial DIN rail power supply rated at 48 V DC, 1.6 A and 76.8 W. It combines an adjustable output, free-air convection and mounting on TS-35/7.5 or TS-35/15 rail. The front drawing identifies a DC OK indicator and +V ADJ control. The specified 112.5 W peak is a short-duration capability, subject to the loading patterns and input/temperature curves below.
Product Datasheet
Download MEAN WELL SDR-75 Datasheet (PDF)
The SDR-75 section is on PDF pages 1, 2, 3. Refer to the complete mechanical drawings and notes when planning installation.
Model and DC Output
| Complete model |
SDR-75-48; SDR-75 catalogue revision 2025-06-09. The final code denotes 48 V nominal output. |
| Continuous rating |
48 V DC / 1.6 A / 76.8 W; output-current range 0–1.6 A. |
| Voltage adjustment |
48–55 V, using +V ADJ. Observe the model’s current and power limits when adjusting. |
| Ripple and noise |
120 mVp-p maximum; 20 MHz bandwidth, a 12-inch twisted pair and parallel 0.1 µF / 47 µF termination capacitors. |
| Voltage tolerance |
±1.0%, including setup tolerance, line regulation and load regulation. |
| Line / load regulation |
±0.5% / ±1.0%, respectively. |
| Typical efficiency |
90% at the default 230 VAC input, rated-load and 25°C ambient test conditions. |
Use the published complete-model continuous and peak ratings; the series number and family-wide efficiency headline do not replace the individual model values.
Peak Loading and Repetition Conditions
| Peak current / power |
2.34 A / 112.5 W, for a maximum of 3 seconds. The catalogue describes this as 150% peak-load capability. |
| Loading pattern 1 |
The published waveform alternates 75 W for 100 seconds with 112.5 W for 3 seconds. |
| Loading pattern 2 |
The second waveform alternates 37.5 W for 15 seconds with 112.5 W for 3 seconds. |
These are the two specific loading patterns on PDF page 3, not permission to repeat the peak at an arbitrary duty cycle. Keep every peak within 3 seconds and apply the applicable peak-temperature curve and input derating. Continuous loading must follow the separate continuous curve.
The SDR-75 diagrams label the baseline as 75 W or 37.5 W and the peak as 112.5 W. Retain those waveform values separately from this model’s published continuous rating; do not recalculate a larger peak from 150% of the model’s rounded rating.
Input and Timing
| Input range |
88–264 VAC or 124–370 VDC; AC frequency 47–63 Hz. |
| Typical AC current |
1.4 A at 115 VAC; 0.85 A at 230 VAC. |
| Typical inrush current |
30 A at 115 VAC; 50 A at 230 VAC. |
| Setup / rise at full load |
1500 / 60 ms at 230 VAC; 3000 / 60 ms at 115 VAC. |
| Typical hold-up at full load |
80 ms at 230 VAC; 20 ms at 115 VAC. |
| Leakage current |
Less than 1 mA at 240 VAC. |
| DC input connection |
The specification explicitly permits DC input with AC/L connected to DC positive and AC/N connected to DC negative. |
| Switching-frequency reference |
85 kHz, as marked in the block diagram. |
Unless otherwise specified, parameters are measured at 230 VAC input, rated load and 25°C ambient. Low input voltage requires load derating.
Protection
| Overload: lower range |
At 110–150% of rated output power, the catalogue describes operation for more than 3 seconds followed by output shutdown. Re-power to recover after shutdown. |
| Short-circuit / overload: higher range |
At 150–170% of rated power, constant-current limiting has automatic recovery within the first 3 seconds; after 3 seconds the output shuts down. Re-power to recover after shutdown. |
| Overvoltage |
56–65 V; output shuts down, then re-power to recover. |
| Overtemperature sensing |
100 ±10°C, detected by RTH2 on main power transistor. This is an internal sensing temperature, not an ambient rating. |
| Overtemperature recovery |
Output shuts down; after temperature falls, re-power to recover. |
The overload time description is a protection response. It does not extend the separately specified 3-second maximum peak-loading period.
Cooling, Derating and Environment
| Cooling / orientation |
Free-air convection; the published temperature curves are for vertical mounting. |
| Working ambient range |
-30 to +70°C, subject to the input and thermal conditions below. |
| Low-temperature input condition |
The −30 to −25°C portion of the temperature graph is explicitly limited to 230 VAC input. |
| Continuous temperature curve |
The 48 V branch shows 100% load up to 60°C, then decreases along the plotted line to 75% at 70°C. |
| Short-peak temperature curve |
The 48 V branch shows the 150% short-peak level up to 60°C, decreasing to 125% at 70°C. The 3-second limit and published absolute peak-power rating still apply. |
| Input-voltage curve, 60 Hz |
The graph shows 90% load at 88 VAC, rising to 100% at 100 VAC. The 100% plateau continues through 264 VAC. |
| Working humidity |
20–95% RH, non-condensing. |
| Storage |
−40 to +85°C; 10–95% RH. |
| Temperature coefficient |
±0.03%/°C over 0–60°C. |
| Vibration |
10–500 Hz, 2G, 10 min/cycle and 60 min on each X, Y and Z axis; mounting compliance IEC60068-2-6. |
| High-altitude derating |
For this fanless model, reduce the permitted ambient temperature by 3.5°C per 1000 m above 2000 m, as specified by the catalogue footnote. |
Apply the input and temperature limits together. The maximum ambient temperature is not a full-load rating, and the short-peak curve must not be used as the continuous curve.
Dimensions, Wiring and Installation
| Body size |
32 × 125.2 × 102 mm (W × H × D), case 221A; general drawing tolerance ±1 mm. |
| DIN rail compatibility |
TS-35/7.5 or TS-35/15; the mechanical drawing shows a 35 mm rail profile. |
| Input terminal block TB1 |
pin 1: FG; pin 2: AC/N or DC(−); pin 3: AC/L or DC(+). |
| Output terminal block TB2 |
pins 1,2: −V; pins 3,4: +V. |
| Indication / adjustment |
The mechanical drawing identifies the DC OK indicator and +V ADJ output-voltage control. |
| Recommended installation clearances |
For permanent full-power loading: 40 mm above, 20 mm below, and 5 mm on both left and right sides. When the adjacent device is a heat source, 15 mm clearance is recommended. |
| Catalogue unit weight |
510 g per unit, from the explicit PACKING reference. Full entry: 0.51 kg; 28 pcs / 15.3 kg / 1.23 CUFT. Carton gross mass is not the unit weight. |
Use the exact terminal numbering and rail-latch geometry on PDF page 2; connect FG protective earth and follow the supplied unit’s installation instructions and terminal markings. Rail compatibility does not mean that a rail is supplied. The assigned pages list no separately orderable MEAN WELL rail, bracket, cover or connector accessory code.
Safety, Insulation and EMC
| Catalogue-listed safety approvals |
UL508; TUV BS EN/EN62368-1; AS/NZS62368.1; EAC TP TC004. |
| Additional standards statement |
Design reference to GL; meets BS EN/EN60204-1. |
| Withstand voltage |
Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC. |
| Insulation resistance |
Greater 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. |
| EMC immunity and voltage-dip compliance |
BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2 (BS EN/EN50082-2); BS EN/EN61204-3, heavy-industry level; EAC TP TC020; SEMI F47 approved. |
The power supply is a component intended for final equipment. Reconfirm EMC compliance in the completed equipment; the component listings do not certify the whole installation.
Reliability and Manufacturer Information
| MTBF reference |
2670.8 K hours minimum under Telcordia SR-332 (Bellcore); 479.8 K hours minimum under MIL-HDBK-217F at 25°C. These are reliability references, not a guaranteed service life. |
| Factory test / warranty |
The catalogue lists 100% full-load burn-in testing and a three-year warranty, subject to applicable manufacturer terms. |
