MEAN WELL SDR-240-48 is a single-output industrial DIN rail power supply rated at 48 V DC, 5 A and 240 W. It accepts 88–264 VAC or 124–370 VDC, uses free-air convection and includes active PFC, adjustable output and a DC OK relay. Peak output up to 360 W is limited to three seconds and the operating conditions below.
Product Datasheet
Download MEAN WELL SDR-240 Datasheet (PDF)
The SDR-240 section is on PDF pages 7, 8, 9. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output
| Complete model |
SDR-240-48; SDR-240 catalogue revision 2025-02-17. The final number identifies the nominal 48 V output. |
| Rated DC output |
48 V / 5 A / 240 W; current range 0–5 A. |
| Peak output |
7.5 A / 360 W (150% of rated power), for a maximum of 3 seconds and subject to the peak-loading and derating conditions below. |
| Voltage adjustment |
48–55 V using +V ADJ. Observe the rated current and power limits when adjusting voltage. |
| Ripple and noise |
50 mVp-p maximum, measured at 20 MHz bandwidth with a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. |
| Voltage tolerance |
±1%, including setup tolerance, line regulation and load regulation. |
| Line / load regulation |
±0.5% / ±1.0%, respectively. |
| Typical efficiency |
94% typical at 230 VAC, rated load and 25°C ambient; measured after 30 minutes of burn-in. |
Input and Timing
| AC / DC input |
88–264 VAC or 124–370 VDC; AC frequency 47–63 Hz. |
| Active PFC / typical power factor |
Built-in active power-factor correction; typical PF 0.94 at 230 VAC and 0.99 at 115 VAC, at full load. |
| Typical AC input current |
2.6 A at 115 VAC; 1.3 A at 230 VAC. |
| Typical inrush current |
33 A at 115 VAC; 55 A at 230 VAC. |
| Leakage current |
Less than 1 mA at 240 VAC. |
| Setup / rise time |
650 / 60 ms at 230 VAC; 1300 / 60 ms at 115 VAC, at full load. |
| Typical hold-up time |
20 ms at both 230 VAC and 115 VAC, at full load. |
Unless otherwise stated, specifications are measured at 230 VAC input, rated load and 25°C ambient.
Peak Loading and Derating
| Peak-duration limit |
Up to 360 W for no more than 3 seconds, within the permitted input and temperature conditions. Peak capability is not a continuous power rating. |
| Temperature curves |
For vertical mounting, continuous load is 100% from −25 to +60°C, decreasing to 75% at +70°C. The three-second peak curve is 150% through +60°C, decreasing to 112.5% at +70°C. |
| Input-voltage curve |
At 60 Hz AC, the graph shows 90% load at 88 VAC, increasing to 100% at 100 VAC and remaining at 100% through 264 VAC. |
| Cooling / orientation |
Free-air convection; use vertical mounting for the published temperature-derating curves. Keep the ventilation path unobstructed. |
The page 9 peak-loading diagrams show two examples: 240 W for 100 seconds followed by 360 W for 3 seconds, or 120 W for 10 seconds followed by 360 W for 3 seconds. The marked 100-second and 10-second durations are the lower-load intervals, not the complete cycle periods. These examples do not establish an unrestricted duty cycle for other load patterns.
Apply the input and temperature restrictions together; use the more restrictive allowable load. See PDF page 9 for the full curves.
Protection and DC OK Monitoring
| Short circuit / overload |
The catalogue lists short-circuit protection. At 110–150% of rated output power, overload operation lasting more than 3 seconds is followed by output shutdown with automatic recovery. |
| Above 150% rated power |
Constant-current limiting with automatic recovery within 2 seconds; operation beyond 2 seconds may cause output shutdown. |
| Overvoltage |
56–65 V; output shutdown, with automatic recovery. |
| Overtemperature |
95±5°C at TSW on the heatsink of the power switch; output shuts down and recovers automatically after cooling. This is an internal sensing temperature, not an ambient operating limit. |
| DC OK relay states |
Contact closed: PSU turns on / DC OK. Contact open: PSU turns off / DC Fail. |
| DC OK contact ratings |
Maximum resistive-load ratings: 60 VDC / 0.3 A, 30 VDC / 1 A, or 30 VAC / 0.5 A. |
| Front indication / adjustment |
DC OK LED and +V ADJ output adjustment are shown on the mechanical drawing. |
Protection thresholds describe fault response; they do not extend the permitted three-second peak duration. The DC OK relay is a monitoring contact, not an auxiliary power output.
Environment and Reliability
| Working temperature / humidity |
−25 to +70°C subject to the stated derating; 20–95% RH, non-condensing. |
| Storage temperature / humidity |
−40 to +85°C; 10–95% RH. |
| Temperature coefficient |
±0.03%/°C over 0–50°C. |
| Vibration |
Component: 10–500 Hz, 2G, 10 min/cycle, 60 min along each X, Y and Z axis. Mounting: compliance with IEC60068-2-6. |
| MTBF reference |
1160.3 K hours minimum, Telcordia SR-332 (Bellcore); 169.3 K hours minimum, MIL-HDBK-217F at 25°C. These are reliability calculations, not a guaranteed service life. |
For this fanless model, apply an additional ambient-temperature derating of 3.5°C per 1000 m above 2000 m. This footnote does not specify a maximum approved installation altitude.
Safety, Isolation and EMC
| Catalogue approval listing |
UL508, TUV BS EN/EN62368-1, AS/NZS62368.1, BSMI CNS15598-1 and EAC TP TC004. The catalogue also states that the unit meets BS EN/EN60204-1. |
| Withstand voltage |
Input–output: 3 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC; output–DC OK: 0.5 kVAC. |
| Isolation resistance |
Greater than 100 MΩ for input–output, input–FG and output–FG, at 500 VDC, 25°C and 70% RH. |
| EMC emission |
BS EN/EN55032 (CISPR32), BS EN/EN61204-3 Class B, BS EN/EN61000-3-2 and -3, EAC TP TC020 and CNS15936. |
| EMC immunity |
BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN55035; BS EN/EN61000-6-2 (EN50082-2); BS EN/EN61204-3, heavy-industry level; EAC TP TC020. |
| Voltage-sag immunity |
SEMI F47 approved, as listed in the catalogue. |
This power supply is a component for installation in final equipment. The completed equipment must be checked again for applicable EMC compliance.
Dimensions, Terminals and Installation
| Body dimensions |
63 × 125.2 × 113.5 mm (W × H × D); case 979A; drawing tolerance ±1 mm. |
| DIN rail |
Compatible with TS-35/7.5 or TS-35/15; the rail drawing marks a 35 mm width. |
| TB1 input terminals |
Pin 1: FG (protective earth); pin 2: AC/N; pin 3: AC/L. |
| TB2 output / signal terminals |
Pins 1 and 2: DC OK relay contact; pins 3 and 4: +V; pins 5 and 6: −V. |
| Recommended full-load clearances |
40 mm above, 20 mm below and 5 mm at each side. Where the adjacent device is a heat source, 15 mm clearance is recommended. |
| Wiring and fastening |
Follow the actual terminal markings and connect FG to protective earth. Use the unit’s installation instructions for conductor size and tightening torque; these catalogue pages do not give numerical limits. |
Refer to PDF page 8 for the terminal layout, DIN-rail latch and body drawing. A compatible DIN rail is an installation item; its compatibility does not mean a rail is included. No separately orderable MEAN WELL bracket, cover, connector or cable accessory code is specified in these SDR-240 pages.
This model has no P suffix. Do not apply the SDR-480P parallel current-sharing specification to this model.
Weight and Manufacturer Information
| Catalogue packing reference per unit |
1030 g, from the PACKING entry on PDF page 7: 1.03 kg; 12 pcs / 13.4 kg / 1.22 CUFT. This is a catalogue packing reference, not a measured net or shipping weight. |
| Production test |
The manufacturer lists a 100% full-load burn-in test. |
| Manufacturer warranty |
The catalogue lists a three-year warranty, subject to the manufacturer’s applicable terms. |
