MEAN WELL SDR-480-24 is a single-output industrial DIN rail power supply rated at 24 V DC, 20 A and 480 W. It accepts 90–264 VAC or 127–370 VDC, uses free-air convection and includes active PFC, adjustable output and a DC OK relay. Peak output up to 720 W is limited to three seconds and the operating conditions below.
Product Datasheet
Download MEAN WELL SDR-480 Datasheet (PDF)
The SDR-480 section is on PDF pages 10, 11, 12. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output
| Complete model |
SDR-480-24; SDR-480 catalogue revision 2025-02-17. The final number identifies the nominal 24 V output. |
| Rated DC output |
24 V / 20 A / 480 W; current range 0–20 A. |
| Peak output |
30 A / 720 W (150% of rated power), for a maximum of 3 seconds and subject to the peak-loading and derating conditions below. |
| Voltage adjustment |
24–28 V using +V ADJ. Observe the rated current and power limits when adjusting voltage. |
| Ripple and noise |
100 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 |
±1.2%, 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. |
Input and Timing
| AC / DC input |
90–264 VAC or 127–370 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 |
5 A at 115 VAC; 2.5 A at 230 VAC. |
| Typical inrush current |
40 A at 115 VAC; 80 A at 230 VAC. |
| Leakage current |
Less than 0.8 mA at 240 VAC. |
| Setup / rise time |
1500 / 150 ms at 230 VAC; 3000 / 150 ms at 115 VAC, at full load. |
| Typical hold-up time |
14 ms at 230 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 720 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, the continuous-load curve at 230 VAC allows 100% through +60°C, while at 100 VAC the full-load limit is +55°C; both decrease to 80% at +70°C. The three-second peak curve has an upper envelope of 150% through +60°C, decreasing to 120% at +70°C. Apply the input-voltage limit and average-power restriction as well. |
| Input-voltage curve |
At 60 Hz AC, the graph shows 90% load at 90 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 average output power must not exceed 480 W, and each peak must last no more than 3 seconds. The second page 12 example shows 240 W for 15 seconds followed by 720 W for 3 seconds; its calculated cycle average is 320 W before applying any additional derating. Do not use a peak diagram to bypass the average-power limit.
Apply the input and temperature restrictions together; use the more restrictive allowable load. See PDF page 12 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 |
29–33 V; output shutdown, with automatic or re-powering recovery. |
| Overtemperature |
Output shutdown, with automatic recovery after the temperature decreases. The catalogue does not specify a numerical trip temperature for this model. |
| 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 |
964.2 K hours minimum, Telcordia SR-332 (Bellcore); 91.9 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 |
85.5 × 125.2 × 128.5 mm (W × H × D); case 984A; 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: +V; pins 3 and 4: −V; pins 5 and 6: DC OK relay contact; pins 7 and 8: NC (no connection). |
| 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 11 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-480 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 |
1600 g, from the PACKING entry on PDF page 10: 1.6 kg; 8 pcs / 13.8 kg / 0.9 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. |
