MEAN WELL RSD-30G-24 is an enclosed, isolated railway DC/DC converter delivering 24 V at up to 1.25 A, with a rated output of 30 W. This G-input model accepts 9–36 VDC continuously. Its 25 mm metal enclosure, semi-potted silicone construction and fanless cooling suit railway, transport, telecom and industrial equipment, subject to the specified input, thermal and installation conditions.
Product Datasheet
Download MEAN WELL RSD-30 Datasheet (PDF)
The RSD-30 section is on PDF pages 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. Refer to the complete mechanical drawings and notes when planning installation.
Model and DC Output
Full model
RSD-30G-24
Series
RSD-30
Input code
G
DC output voltage
24 V
Rated output current
1.25 A
Rated output power
30 W
Output current range
0–1.25 A; no minimum load required
Maximum ripple and noise
50 mVp-p
Voltage tolerance
±2.0%
Line regulation
±0.2%
Load regulation
±0.2%
Set-up / rise time at full load
120 ms / 85 ms
The electrical values above apply to RSD-30G-24. Voltage tolerance includes set-up tolerance, line regulation and load regulation. Except where stated otherwise, the catalogue measurements use 24 VDC input, rated load and 25°C ambient temperature.
Ripple and noise are measured with 20 MHz bandwidth and a 12-inch twisted-pair connection terminated with 0.1 µF and 47 µF capacitors in parallel. The manufacturer strongly recommends limiting external output capacitance to 5000 µF or less.
Input, Startup and Interruption Behaviour
Continuous DC input range
9–36 VDC
Input-range ratio
4:1
Typical efficiency
89%
Typical DC input current
1.5 A at 24 VDC
Typical input inrush current
20 A at 24 VDC
Short-duration input-transient capability
±40% of rated input voltage for 1 second
Supply-interruption reference
EN 50155:2021, S1 level
Nominal switching frequency
110 kHz
Internal input fuse reference
CONQUE MST, time-lag, 6.3 A, 250 V
Select the input version by its continuous DC range. The separate 1-second transient statement is a short-duration withstand condition; continuous operation remains within the specified input range.
The fuse is in series with the positive input. A resistor limits inrush during startup and is then bypassed by a MOSFET to reduce power consumption. The fuse reference identifies an internal component and its rating.
The model-specific hold-up curve indicates approximately 10 ms at 80% load. Hold-up time varies with load; use the RSD-30G-24 curve when selecting the interruption load. This graph point is not a full-load hold-up guarantee.
Protection and Status Indication
Short-circuit / overload function
Built-in constant-current limiting; automatic recovery after the fault is removed
Overload detection range
105–135% of rated output power
Overvoltage protection 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 under reversed polarity; no output
Input undervoltage protection
Internal control shuts down below its threshold; output recovers automatically when input rises above the recovery threshold
Power indicator
Green LED: normal operation; no indication: no input power or failure
Illustrated undervoltage thresholds for this 24 V model
Turn on: 8.3 VDC; turn off: 6.3 VDC
Constant-current protection is a fault response, not an additional continuous rating. Continuous overload operation can cause excessive temperature, reduced life or damage.
The turn-on and turn-off points are the model-labelled graph values. They do not replace the specified continuous input range.
Operating Environment and Load Derating
Operating ambient range
−40 to +70°C, subject to input and thermal conditions
Free-air full-load upper ambient limit
55°C
Free-air load limit at 70°C
60%
Full load at 70°C with added base plate
Permitted with the specified external iron-plate mounting arrangement
Low-temperature input condition
In the −40 to −35°C shaded region, input must be at least 24 VDC
Case-temperature graph limit
75°C at the indicated tc position
Operating humidity
5–95% RH, non-condensing
Storage temperature
−40 to +85°C
Temperature coefficient
±0.03%/°C over 0–50°C
Operating altitude
Up to 5000 m, with the high-altitude temperature derating below
Vibration rating
10–500 Hz, 5 G; 10 minutes per cycle, 60 minutes on each X, Y and Z axis; mounting to IEC 61373
Without an added iron plate, the ambient-temperature curve shows full load through 55°C, followed by derating to 60% at 70°C. Use the more restrictive input-voltage and temperature limits together.
For this fanless converter, reduce the allowable ambient temperature by 3.5°C per 1000 m above 2000 m. The operating-altitude limit remains 5000 m.
The separate case-temperature plot ends at 75°C. Monitor the tc point identified in the mechanical drawing; a case-temperature limit is not an ambient-temperature rating.
Mechanical Installation and Terminal Connections
Dimensions, L × W × H
113 × 60 × 25 mm
Mechanical drawing
Case No. 253A; dimensions in mm, general tolerance ±1 mm
Unit mass
250 g; catalogue PACKING reference per unit
Enclosure and cooling
Enclosed metal case, 25 mm low profile; semi-potted silicone interior; free-air convection
Mounting holes
Four Ø3.5 mm holes on a 105 × 52 mm pattern
Input terminal 1
DC INPUT V+
Input terminal 2
DC INPUT V−
Input terminal 3
FG / chassis ground
Output terminal 1
DC OUTPUT −V
Output terminal 2
DC OUTPUT +V
tc drawing location
46 mm from the right end and 7 mm above the base in the side view
External cooling plate shown
360 × 360 × 2 mm iron plate; M3 × 4 screws illustrated
Follow the numbered input and output terminal assignments in the RSD-30 mechanical drawing. The input and output blocks have separate numbering; connect FG to the designated chassis-ground terminal.
For full-load operation at 70°C under the EN 50155 TX installation condition, mount the converter firmly at the centre of the specified iron plate. The mating surface must be flat and smooth for effective heat transfer. The plate is an added thermal component; this mounting condition does not describe a plate supplied as standard.
The catalogue illustrates several horizontal and vertical enclosure orientations, both with and without the added plate, and states that the illustrated methods share the applicable derating curve because the unit is semi-potted. Maintain free-air convection and verify the completed mounting arrangement.
Options, Redundancy and Series Connection
Output-voltage adjustment
Optional by manufacturer arrangement; absent from the standard product
Internal current-sharing circuit
Not fitted
Parallel use described
External diode-assisted redundancy only; output current rating is not increased
Redundancy diode requirement
One diode at each positive output; diode current rating greater than the converter maximum output current, with a suitable heat sink
Series use described
Bipolar outputs or summed output voltage; the available current does not increase
Series blocking-diode requirement
External diodes as shown in the catalogue; voltage rating greater than the total V1 + V2
For optional output adjustment, contact MEAN WELL for the applicable supply arrangement before ordering. The catalogue does not identify a separate adjustment-option ordering suffix.
Redundant parallel operation requires an external circuit suitable for the system. Parallel connection increases leakage current; consult the supplier and verify the complete installation.
The unit does not contain the reverse-blocking diodes needed for the illustrated series arrangement. Use the external-diode topology in the catalogue to protect each converter during startup. Series connection can form positive and negative rails around a common point or add output voltages.
The series pages do not identify separately orderable MEAN WELL cable, terminal-housing, diode-kit or cooling-plate model numbers. Select external components by the stated electrical and mechanical requirements; the catalogue case and fuse references are component information.
Safety, EMC and Reliability
Catalogue approved safety standards
IEC 62368-1; UL 62368-1; AS/NZS 62368-1; EAC TP TC 004
Catalogue safety design reference
BS EN/EN 62368-1
Railway standards listed
BS EN/EN 50155 / IEC 60571; IEC 61373 for shock and vibration; BS EN/EN 50121-3-2 for EMC; BS EN/EN 45545-2 for fire protection
Input-to-output withstand voltage
4 kVDC; reinforced isolation
Input-to-FG withstand voltage
2.5 kVDC
Output-to-FG withstand voltage
2.5 kVDC
Insulation resistance
100 MΩ at 500 VDC, 25°C and 70% RH; input–output, input–FG and output–FG
Conducted emissions
BS EN/EN 55032, Class A
Radiated emissions
BS EN/EN 55032, Class B
EMC immunity reference
BS EN/EN 55035
ESD immunity
BS EN/EN 61000-4-2; Level 3, ±8 kV air and ±6 kV contact
Radiated-field immunity
BS EN/EN 61000-4-3; Level X, 20 V/m
EFT / burst immunity
BS EN/EN 61000-4-4; Level 3, 2 kV on power
Surge immunity
BS EN/EN 61000-4-5; Level 3, 1 kV line–line and 2 kV line–earth
Conducted immunity
BS EN/EN 61000-4-6; Level 3
MTBF, Telcordia SR-332
3093.5 thousand hours minimum
MTBF, MIL-HDBK-217F
396.9 thousand hours minimum at 25°C
Catalogue warranty period
3 years; subject to manufacturer terms
The converter is a component for integration into end equipment. Catalogue approvals and design references describe the converter and do not constitute certification of the completed railway vehicle or other end system.
The EMC test fixture uses a 360 × 360 × 1 mm metal plate. This EMC fixture is distinct from the 2 mm iron plate specified for full-load operation at 70°C. EMC compliance must be reconfirmed for the completed installation.
MTBF values are reliability calculations under the stated method and conditions, not a guaranteed operating lifetime.
Catalogue Environmental and Fire Tests
Dry heat test, EN 50155 §13.4.5
PASS; 70°C for 6 hours and 85°C for 10 minutes
Cyclic damp heat test, EN 50155 §13.4.8
PASS; 25–55°C, 90–100% RH, 48 hours
Vibration environmental test, EN 50155 §13.4.10
PASS; 19°C, 65% RH, 10 minutes
Shock environmental test, EN 50155 §13.4.10
PASS; 21 ±3°C, 65 ±5% RH, 30 ms × 18
Low-temperature storage test, EN 50155 §13.4.6
PASS; −40°C, 16 hours
Salt-mist test, EN 50155 §13.4.13
PASS; 35 ±2°C, 96 hours
PCB fire tests
EN 45545-2:2020: R22 oxygen index, smoke density and smoke toxicity; R24 oxygen index; R25 glow-wire test. HL1, HL2 and HL3: PASS for each listed test.
Potting material fire test
EN 45545-2:2020 R24 oxygen-index test; HL1, HL2 and HL3: PASS
Terminal-block fire test
EN 45545-2:2020 R26 vertical-flame test; HL1, HL2 and HL3: PASS
The following are the catalogue environmental and material-test results, with their specific test exposures. They do not extend the continuous operating temperature, humidity or mounting limits.
The fire-test table covers the specified PCB, potting material and terminal block. Its supporting methods include EN ISO 4589-2:2017, EN ISO 5659-2:2017, EN 17084:2018, EN 60695-2-11:2014 and EN 60695-11-10:2013 as applicable to the listed material and test.
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