The MEAN WELL SD-500H-24 is an isolated DC/DC converter with a 24 V output rated at 21 A and 504 W. Its H-code input accepts 72–144 VDC, subject to the input-voltage and temperature derating curves. A built-in fan with speed control, remote sensing, remote ON/OFF control and an OUTPUT OK signal support equipment integration.
Product Datasheet
Download MEAN WELL SD-500 Datasheet (PDF)
The SD-500 section is on PDF pages 18, 19, 20, 21. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Ratings
| Full model |
SD-500H-24 |
| Series |
SD-500 |
| Input version |
H: 72–144 VDC |
| DC output voltage |
24 V |
| Rated output current |
21 A |
| Rated output power |
504 W |
| Output current range |
0–21 A |
| Output voltage adjustment |
23–30 V |
| Maximum ripple and noise |
150 mVp-p |
| Voltage tolerance |
±1.0% |
| Line regulation |
±0.5% |
| Load regulation |
±0.5% |
Use the stated voltage, current and power limits together when setting the output. The series name is not the output-power rating of every voltage version. Remote sensing compensates wiring loss within its own limit; it does not increase the converter rating.
Input and Electrical Performance
| DC input range |
72–144 VDC |
| Typical efficiency |
89% |
| Typical input current |
8 A at 72 VDC; 6 A at 96 VDC |
| Maximum no-load input current |
0.1 A at 96 VDC |
| Typical inrush current |
60 A at 96 VDC |
| Input surge-current limiting |
Built-in active circuit |
| Input polarity protection |
By fuse |
| Set-up / rise time at full load |
500 / 50 ms |
| Standard measurement conditions |
96 VDC input, rated load and 25°C ambient |
Ripple and noise are measured at 20 MHz bandwidth using a 12-inch twisted pair terminated with parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Select the DC source and wiring for the actual input range and input-current demand. Apply the low-input load restriction as well as the ambient-temperature restriction.
Protection
| Protection functions |
Short circuit, overload, overvoltage and overtemperature |
| Overload threshold |
105–125% of rated output power |
| Overload behavior |
Constant-current limiting; output shutdown after approximately 5 seconds |
| Overload recovery |
Reapply input power to recover |
| Overvoltage threshold |
30.8–35.2 V |
| Overvoltage behavior |
Output shutdown; reapply input power to recover |
| Overtemperature behavior |
Output shutdown; automatic recovery after the temperature falls |
Power Connections and Signal Mating Parts
| Main power terminal assignment |
1: DC INPUT V+; 2: DC INPUT V−; 3: FG; 4 and 5: −V; 6 and 7: +V |
| Signal connector |
CN3 HRS DF11-6DP-2DS or equivalent |
| Signal-pin assignment |
pin 1: +S; pin 2: −S; pin 3: OUTPUT OK; pin 4: GND; pin 5: RC; pin 6: RCG |
| Mating housing |
HRS DF11-6DS or equivalent |
| Mating terminal |
JST SPHD-002T-P0.5 or equivalent |
Connect the protective-earth conductor to FG. Observe the separate DC input and output polarities; the −V and +V terminal groups are identified in the mechanical drawing.
Choose the mating housing, terminals and wire assembly for CN3 from the listed references. Confirm which mating parts are supplied with the order.
Remote ON/OFF Control
| Remote-control pins |
CN3 pin 5: RC; pin 6: RCG |
| External-voltage method, Figure 1.2(B) |
Across RC and RCG: 0–0.8 V turns the output on; 4–10 V turns it off |
| External 5 V switch method, Figure 1.2(A) |
With the external 5 V source and switch wired as shown: switch open turns the output on; switch closed turns it off |
Follow the polarity and complete connection shown for the selected control method. The Figure 1.2(A) switch states refer to that powered circuit, rather than an unspecified switch connection.
OUTPUT OK Status and Remote Sensing
| OUTPUT OK pins |
CN3 pin 3: OUTPUT OK; pin 4: GND |
| OUTPUT OK interface |
Open-collector signal |
| OUTPUT OK maximum external voltage / sink current |
13 V / 10 mA |
| OUTPUT OK voltage mode |
Output on: 0–0.5 V; output off: 12–13 V |
| Signal GND reference |
Connected to the main −V output |
| Remote-sense pins |
CN3 pin 1: +S; pin 2: −S |
| Maximum remote-sense compensation |
0.5 V line-voltage drop |
Connect +S to the positive load terminal and −S to the negative load terminal using a twisted pair. Keep the sense pair separate from the load-current conductors and observe the 0.5 V compensation limit. The OUTPUT OK connection is a status interface, not a load-power output.
Cooling and Environmental Limits
| Cooling |
Built-in fan with speed control |
| Working temperature |
−20 to +60°C, subject to derating |
| Horizontal-installation thermal curve |
100% load through 50°C; reduce to 60% at 60°C |
| Input-voltage load curve |
100% load from 72 to 144 VDC |
| Working humidity |
20–90% RH, non-condensing |
| Storage temperature / humidity |
−40 to +85°C; 10–95% RH |
| Temperature coefficient |
±0.02%/°C from 0 to 50°C |
| Vibration |
10–500 Hz, 2 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis |
Keep the fan inlet and exhaust path clear. The published curves are for horizontal installation; apply the input-voltage and temperature limits together.
Above 2000 m, reduce the allowable ambient temperature by 5°C for each additional 1000 m for this fan-cooled model.
Safety and EMC
| Catalogue-listed safety approvals |
IEC 62368-1; TUV BS EN / EN 62368-1; EAC TP TC 004 |
| Additional safety design reference |
AS/NZS 62368.1 |
| Withstand voltage |
Input–output: 2 kVAC; input–FG: 2 kVAC; output–FG: 0.5 kVAC |
| Isolation resistance |
Input–output, input–FG and output–FG: 100 MΩ at 500 VDC, 25°C and 70% RH |
| EMC emission |
BS EN / EN 55032 (CISPR 32), Class B; EAC TP TC 020 |
| EMC immunity |
BS EN / EN 61000-4-2/-3/-4/-6/-8; BS EN / EN 55035; light-industry level; EAC TP TC 020 |
The EMC test installation uses a 360 × 360 × 1 mm metal plate. This converter is a component for integration into final equipment; check the completed installation against the applicable EMC requirements.
Mechanical Data and Installation
| Catalogue dimensions, L × W × H |
215 × 115 × 50 mm |
| Case number |
912A |
| Mechanical-drawing tolerance |
±1 mm |
| Mounting-thread callouts |
M4, L = 5 mm; M3, L = 3 mm |
| Mass, catalogue PACKING reference per unit |
1150 g |
| Catalogue packing |
1.15 kg; 12 units / 14.8 kg / 0.9 CUFT |
| Minimum MTBF |
1333.7K hours, Telcordia SR-332 (Bellcore); 196.3K hours, MIL-HDBK-217F at 25°C |
| Catalogue warranty |
3 years |
Follow the hole locations and location-specific screw lengths in the mechanical drawing. Allow additional space for the projecting terminals, mating connectors, cable bends and cooling airflow. The catalogue dimensions are not a complete installed cable-clearance envelope.
The per-unit PACKING figure is a catalogue packing reference, not a measured net weight or shipping-package weight.
