The MEAN WELL RSD-100C-24 is a railway single-output DC/DC converter delivering 24 V at up to 4.2 A (100.8 W). This C input version accepts 33.6–62.4 VDC continuously. Its half-encapsulated, fanless enclosure provides 4 kVDC input-to-output isolation. Select the load and mounting arrangement using the model-specific ratings and thermal limits below.
Product Datasheet
Download MEAN WELL RSD-100 Datasheet (PDF)
The RSD-100 section is on PDF pages 21, 22, 23, 24, 25, 26, 27. Refer to the complete mechanical drawings and notes when planning installation.
Model and Output Ratings
| Full model |
RSD-100C-24 |
| Series |
RSD-100 |
| Input version |
C: 48 VDC nominal test input |
| Output code |
24: 24 VDC nominal output |
| DC output voltage |
24 V |
| Rated output current |
4.2 A |
| Rated output power |
100.8 W |
| Output current range |
0–4.2 A |
| Maximum ripple and noise |
150 mVp-p |
| Voltage tolerance |
±2.0% |
| Line regulation |
±0.2% |
| Load regulation |
±1.0% |
| Output voltage adjustment |
Optional by arrangement with MEAN WELL; not fitted to the standard product |
Use the rated current and power of this full model when choosing the load. The family number is not the exact output power of every version.
DC Input and Performance
| Continuous DC input range |
33.6–62.4 VDC |
| Transient DC input range |
28.8–67.2 VDC for 1 second |
| Typical efficiency |
91% |
| Typical DC input current |
2.4 A at 48 VDC |
| Typical inrush current |
30 A at 48 VDC |
| Set-up / rise time |
800 / 50 ms at full load |
| Supply-interruption classification |
EN 50155:2021, S1 |
| Switching frequency |
130 kHz, as shown in the block diagram |
The wider transient range applies for one second only. Continuous operation must stay within the stated continuous input range.
Unless otherwise specified, ratings are measured at 48 VDC input, rated load and 25°C ambient. Typical efficiency and input current depend on the operating conditions. Ripple and noise use 20 MHz bandwidth and a 12-inch twisted pair with parallel 0.1 µF and 47 µF capacitors. Voltage tolerance includes set-up tolerance, line regulation and load regulation.
Hold-up time depends on load. The RSD-100 catalogue provides hold-up curves for the B and C input versions; select any required ride-through performance from the applicable curve.
Protection and Status
| Short-circuit protection |
Included |
| Overload threshold |
105–135% of rated output power |
| Overload recovery |
Constant-current limiting; automatic recovery after the fault is removed |
| Overvoltage threshold |
27.6–32.4 V |
| Overvoltage recovery |
Output shutdown; reapply input power to recover |
| Input reverse-polarity protection |
A series MOSFET in the negative input opens if the input polarity is reversed |
| Input undervoltage protection |
Output shutdown below the control threshold; automatic restart when input voltage recovers |
| Power indicator |
Green LED: normal operation; no indication: no power or fault |
Do not operate continuously in the overload region. Inrush limiting uses a resistor during start-up and a MOSFET bypass after start-up.
Cooling and Operating Conditions
| Cooling |
Fanless free-air convection; half-encapsulated construction |
| Working temperature without an added thermal plate |
−40 to +55°C at full load; derate linearly to 60% load at +70°C |
| Working temperature with the specified thermal plate |
−40 to +70°C at full load; follow the catalogue mounting arrangement |
| Rated-current case-temperature limit |
70°C at the marked tc point, as shown in the catalogue curve |
| Working humidity |
5–95% RH, non-condensing |
| Storage temperature |
−40 to +85°C |
| Temperature coefficient |
±0.03%/°C from 0 to 50°C |
| Operating altitude |
Up to 5000 m; reduce allowed ambient temperature by 3.5°C per 1000 m above 2000 m |
| Vibration |
10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis; mounting compliance to IEC 61373 |
For full-load operation at +70°C and the specified TX thermal condition, mount the unit firmly at the centre of an even, smooth iron plate measuring 360 × 360 × 1.2 mm. This is a thermal installation component, not an included accessory claim.
The catalogue mounting illustration specifies four M3 fasteners. Use the mechanical drawing and maintain a clear convection path. The plate arrangement is shown on PDF page 26.
Dimensions and Terminal Connections
| Body dimensions, L × W × H |
161 × 68 × 36 mm |
| Case number |
999A |
| Mechanical-drawing tolerance |
±1 mm |
| Terminal projection beyond the body |
12 mm maximum at each end |
| Top mounting-slot centre spacing |
156 × 55 mm |
| Mounting-slot details |
4 × R1.75 mounting slots; side drawing: 2 × R1.75 |
| Input terminals |
Pin 1: DC V+; pin 2: DC V−; pin 3: FG |
| Output terminals |
Pin 1: DC V−; pin 2: DC V+ |
Connect frame ground and observe the numbered terminal polarities. Allow room beyond the stated body size for the terminal projections, wiring and access. Check the full mechanical drawing before preparing the mounting plate.
Installation Parts and Connection Options
| Internal input fuse reference |
1 × Conquer UDA-A, 5 A / 250 V; time-lag type |
| Thermal mounting plate |
360 × 360 × 1.2 mm iron plate; centre mounting on a smooth, even surface |
| Standard parallel capability |
No built-in current-sharing circuit |
| Redundant operation |
Requires an external diode at each positive output; diode current rating must exceed 4.2 A and have suitable heat dissipation |
| Series operation |
Catalogue circuits support positive/negative rails or increased voltage; output current does not increase |
The Conquer UDA-A entry identifies the internal fuse shown in the catalogue; it is not a separately included MEAN WELL accessory. The catalogue does not give dedicated ordering codes for the plate or external connection diodes.
Use the connection diagrams on PDF pages 24–25. External diode isolation is for redundancy, not for increasing output-current capacity. Check combined leakage current and circuit suitability with the equipment supplier.
For a series connection that adds the output voltages, the catalogue requires external blocking diodes because the converter has no internal reverse-blocking diode. Their voltage rating must exceed the combined output voltage.
Isolation, Safety and Railway Standards
| Withstand voltage |
Input–output: 4 kVDC; input–FG: 2.5 kVDC; output–FG: 2.5 kVDC |
| Isolation resistance |
Input–output, input–FG and output–FG: 100 MΩ at 500 VDC, 25°C and 70% RH |
| Catalogue-listed safety approvals |
IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004 |
| Safety design reference |
BS EN / EN 62368-1 |
| EMC emission |
BS EN / EN 55032 (CISPR 32): conducted Class A, radiated Class B; EAC TP TC 020 |
| EMC immunity |
BS EN / EN 61000-4-2/-3/-4/-5/-6/-8; BS EN / EN 55035, light-industry level; EAC TP TC 020 |
| Railway references |
BS EN / EN 50155; IEC 60571; IEC 61373 shock and vibration; BS EN / EN 50121-3-2 EMC; BS EN / EN 45545-2 fire protection |
The supply is a component for installation in final equipment. Catalogue EMC tests used a 360 × 360 mm metal plate, 1 mm thick; check the finished equipment against its applicable EMC requirements. This EMC test plate and the 1.2 mm thermal plate serve different purposes.
PDF page 27 lists environmental test conditions and material-specific EN 45545-2 fire-test results. These component test results do not replace validation of the complete installation.
Mass and Catalogue References
| Mass, catalogue PACKING reference per unit |
563 g |
| Catalogue packing |
0.563 kg; 24 units / 14.5 kg / 0.9 CUFT |
| Minimum MTBF |
2446.2K hours, Telcordia SR-332; 254.2K hours, MIL-HDBK-217F at 25°C |
| Electrolytic capacitors |
105°C long-life type, as listed in the catalogue |
| Catalogue burn-in test |
100% full load |
| Catalogue warranty |
3 years |
The mass is the single-unit reference in the catalogue PACKING field, rather than a measured shipping weight.
