The MEAN WELL RSD-500C-24 is a fanless railway DC/DC converter with a 24 V output rated at 19.2 A and 460.8 W. Its C-code input supports continuous operation from 33.6–67.2 VDC and a separate 1-second input range of 28.8–33.6 VDC. The half-encapsulated enclosure provides 4 kVDC input-to-output isolation; available load depends on ambient temperature and the mounting heat-transfer arrangement.
Product Datasheet
Download MEAN WELL RSD-500 Datasheet (PDF)
The RSD-500 section is on PDF pages 52, 53, 54, 55, 56, 57, 58, 59. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Ratings
| Full model |
RSD-500C-24 |
| Series |
RSD-500 |
| Input version |
C; nominal test input 48 VDC |
| DC output voltage |
24 V |
| Rated output current |
19.2 A |
| Rated output power |
460.8 W |
| Output current range |
0–19.2 A |
| Output voltage adjustment |
24–28 V |
| Maximum ripple and noise |
120 mVp-p |
| Voltage tolerance |
±1.0% |
| Line regulation |
±0.5% |
| Load regulation |
±1.0% |
Use the voltage, current and actual rated power together when selecting the load. The family wattage designation does not replace the rating of this output and input version.
Adjust the output using the +Vo ADJ control and retain the specified current and power limits.
Input, Timing and Measurement Conditions
| Continuous DC input range |
33.6–67.2 VDC |
| 1-second input range |
28.8–33.6 VDC |
| Typical efficiency |
93% |
| Typical DC input current |
11 A at 48 VDC |
| Typical inrush current |
30 A |
| Set-up / rise time |
500 / 60 ms |
| Normal measurement conditions |
48 VDC input, rated load and 25°C ambient |
| Supply interruption, S1 |
3 ms at full load; EN 50155:2021 |
| Supply interruption, S2 |
10 ms at 70% load |
The 1-second range is a transient operating condition, not an extension of the continuous input rating. Keep the input within the continuous range for sustained use.
Ripple and noise are measured at 20 MHz bandwidth with a 12-inch twisted pair terminated by parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Use the dedicated model hold-up-versus-load graph together with the S1 and S2 load conditions. The one-second low-input band does not establish a continuous reduced-input operating point; low-input operation may require load reduction.
Protection and Input Safeguards
| Protection functions |
Short circuit, overload, overvoltage, overtemperature and input reverse polarity |
| Overload threshold |
105–135% of rated output power |
| Overload response |
Constant-current limiting; automatic recovery after the fault is removed |
| Overvoltage threshold |
28.8–35 V |
| Overvoltage recovery |
Output shutdown; reapply input power to recover |
| Overtemperature recovery |
Output shutdown; reapply input power to recover |
| Input reverse polarity |
A MOSFET in series with the negative input opens and prevents output when polarity is reversed |
| Internal input fuse reference |
3 × Conquer MST; time-lag; 10 A, 250 V each |
| Inrush limiting |
Start-up resistor bypassed by a relay after start-up |
| Input undervoltage turn-on specification |
≥33.6 VDC |
| Input undervoltage turn-off specification |
≤33 VDC |
Do not operate continuously in the overload region: overheating can reduce service life or damage the converter. The internal fuse reference describes the installed protection component; it is not an external fuse-selection instruction.
When input voltage falls below the undervoltage operating threshold, the controller stops the output. The output resumes automatically after the input rises sufficiently, provided no latched protection remains active.
Power Terminals and Indicator
| TB1 pin 1 |
DC input +Vin |
| TB1 pin 2 |
DC input −Vin |
| TB1 pin 3 |
FG |
| TB2 pins 1, 2 |
DC output +Vo |
| TB3 pins 3, 4 |
DC output −Vo |
| LED status |
Green: normal operation; unlit: no power or a failure |
Connect the DC source and load with the polarities shown and connect FG to the installation protective-earth system. Size conductors and terminations for the current of this model.
Use the mechanical drawing to identify the physical terminal positions. Leave space for terminal access and cable bends; the body dimensions do not include the full installed wiring envelope.
Cooling, Derating and Environment
| Cooling |
Free-air convection; fanless, half-encapsulated construction |
| Working ambient temperature |
−40 to +80°C, subject to derating and mounting conditions |
| Single-unit ambient load curve |
100% load through 55°C; 90% at 60°C, 50% at 70°C and 30% at 80°C |
| Additional heat-transfer plate |
450 × 450 × 3 mm iron plate |
| Operation with the specified iron plate |
100% load from −40 to +70°C in the published installation |
| Case-temperature curve |
100% rated current up to 85°C at the marked tc point |
| Working humidity |
5–95% RH, non-condensing |
| Storage temperature / humidity |
−40 to +85°C; 5–95% RH, non-condensing |
| Temperature coefficient |
±0.03%/°C over 0–55°C |
| Operating altitude |
Up to 5000 m; overvoltage category II |
| Altitude temperature derating |
Above 2000 m: reduce permitted ambient temperature by 3.5°C per additional 1000 m |
| Vibration |
10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis; mounting in accordance with IEC 61373 |
The ambient and case-temperature limits apply together. A permissible case temperature does not by itself waive the ambient-temperature load curve.
To achieve the published full-load 70°C EN 50155 TX arrangement, firmly mount the converter centrally on the specified smooth, even iron plate with good thermal contact. Follow the illustrated orientation and mounting method. The half-encapsulated construction supports the installation orientations shown in the catalogue with the corresponding common derating curve.
Safety, Isolation and EMC
| Catalogue-listed safety approvals |
UL 62368-1; IEC 62368-1; AS/NZS 62368-1; EAC TP TC 004 |
| Additional safety design reference |
BS EN / EN 62368-1 |
| Railway requirements |
BS EN / EN 50155 and IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection |
| Withstand voltage |
Input–output: 4 kVDC; input–FG: 2.5 kVDC; output–FG: 2.5 kVDC |
| Isolation resistance |
>100 MΩ between input–output, input–FG and output–FG at 500 VDC, 25°C and 70% RH |
| Conducted emission |
BS EN / EN 55032 (CISPR 32), Class A |
| Radiated emission |
BS EN / EN 55032 (CISPR 32), Class B |
| EMC immunity |
BS EN / EN 55035 with the listed IEC 61000-4 immunity tests |
Confirm compliance of the completed installation with the applicable EMC and safety requirements. Component test results do not certify the entire vehicle or equipment.
The immunity table lists criterion A for all six tests: ESD level 3 at 8 kV air and 6 kV contact; radiated RF level 3 at 10 V/m; EFT/burst level 3 at 2 kV; surge level 3 at 1 kV line–line and 2 kV line–line–FG; conducted RF level 3 at 10 V; and magnetic field level 4 at 30 A/m.
The emission table names BS EN / EN 61000-3-3 for voltage flicker, without a numerical test level; it does not list a harmonic-current standard or limit.
Railway Environmental and Fire Test References
The catalogue reports PASS for EN 50155 dry heat (section 13.4.5: 70°C for 6 hours and 85°C for 10 minutes); cyclic damp heat (13.4.8: 25–55°C, 90–100% RH, 48 hours); vibration (13.4.10: 19°C, 65% RH, 10 minutes); shock (13.4.10: 21 ±3°C, 65 ±5% RH, 30 ms ×18); low-temperature storage (13.4.6: −40°C, 16 hours); and salt mist (13.4.13: 35 ±2°C, 96 hours). These are test conditions, not expanded continuous operating limits.
EN 45545-2:2020 fire-test references cover PCB R22 oxygen index (EN ISO 4589-2:2017), smoke density (EN ISO 5659-2:2017) and smoke toxicity (EN 17084:2018); PCB R24 oxygen index; PCB R25 glow-wire (EN 60695-2-11:2014); potting R24 oxygen index; and terminal-block R26 vertical flame (EN 60695-11-10:2013). The listed items are marked PASS at HL1, HL2 and HL3.
Mechanical Data and Installation Items
| Catalogue body dimensions, L × W × H |
237 × 100 × 41 mm |
| Case reference |
270C |
| Drawing tolerance |
±1 mm |
| Mounting layout |
229 mm longitudinal and 84 mm transverse mounting references; one Ø5.2 mm feature marked L = 6.6 mm and three Ø4.2 mm features marked L = 6 mm |
| Iron-plate fixing arrangement |
One M5 and three M4 screws at the illustrated positions |
| Case-temperature measurement point |
Marked tc in the mechanical drawing |
| Unit mass, catalogue PACKING reference |
1450 g |
| Catalogue packing |
1.45 kg; 10 units / 15.5 kg / 0.8 CUFT |
| Minimum MTBF |
834.7K hours, Telcordia SR-332 (Bellcore); 99.1K hours, MIL-HDBK-217F at 25°C |
| Nominal switching frequency |
67 kHz |
| Catalogue warranty |
3 years |
The 41 mm body profile supports low-height equipment layouts. Keep terminal access and the +Vo ADJ control accessible after mounting.
The iron plate, fixings and any external connection components must be selected for the installation. Confirm supplied items with the order; the catalogue plate drawing does not establish that a separate plate kit is included.
The mass is the explicit catalogue packing reference per unit, not a measured net mass or the weight of a complete shipping package.
