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Mean Well

Mean Well RSD-300B-48 DC-DC Converter - 200.4W - 16.8~31.2V in 48V out 5.7A

miniature sizeeconomicalwithstand 5G vibration and 70°C operation
SKU RSD-300B-48
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Overview

RSD-300B-48 is the 48V output model of this series: rated current 5.7A, rated power 273.6W, typical efficiency 91.5%.

Features

  • Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
  • 2:1 wide input range
  • Protections: Short circuit / Overload / Over voltage / Over temperature / Input reverse polarity
  • 4000VDC I/O isolation
  • Cooling by free air convection
  • Half encapsulated
  • Built-in constant current limiting circuit
  • 1U low profile 40mm
  • All using 105℃ long life electrolytic capacitors
  • LED indicator for power on
  • 100% full load burn-in test
  • 3 years warranty

Specifications

RSD-300B-48Specifications from the official datasheet (2025-07-18 edition)

OUTPUT

DC VOLTAGE
48V
RATED CURRENT
5.7A
CURRENT RANGE
0 ~ 5.7A
RATED POWER
273.6W
RIPPLE & NOISE (max.)Note.2
180mVp-p
VOLTAGE TOLERANCENote.3
±2.0%
LINE REGULATION
±0.5%
LOAD REGULATION
±1.0%
SETUP, RISE TIME
800ms, 50ms at full load
HOLD UP TIME (Typ.)
Please refer to page 5,6 Hold up Time( Load de-rating curve )

INPUT

VOLTAGE RANGE CONTINUOUS
16.8 ~ 31.2VDC
VOLTAGE RANGE 1 SEC.
14.4 ~ 33.6VDC
EFFICIENCY (Typ.)
91.5%
DC CURRENT (Typ.)
14.6A/24V
INRUSH CURRENT (Typ.)
45A/24VDC
INTERRUPTION OF VOLTAGE SUPPLY
EN50155:2021-Comply with S1 level

PROTECTION

OVERLOAD
105 ~ 135% rated output power Protection type : Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE
55.2 ~ 64.8V Protection type : Shut down o/p voltage, re-power on to recover
OVER TEMPERATURE
Shut down o/p voltage, recovers automatically after temperature goes down

ENVIRONMENT

WORKING TEMP.
-40 ~ +55℃ (no derating) ; +70℃ @ 60% load by free air convection ; +70℃ no derating with external base plate, TX class compliance
WORKING HUMIDITY
5 ~ 95% RH non-condensing
STORAGE TEMP.
-40 ~ +85℃
TEMP. COEFFICIENT
± 0.03%/℃ (0 ~ 55℃ )
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, 60min. each along X, Y, Z axes ; Mounting : compliance to IEC61373
OPERATING ALTITUDE
5000 meters

SAFETY & EMC (Note 5)

SAFETY STANDARDS
IEC 62368-1, UL 62368-1, AS/NZS 62368-1, EAC TP TC 004 approved, Design refer to BS EN/EN62368-1
WITHSTAND VOLTAGE
I/P-O/P:4KVDC I/P-FG:2.5KVDC O/P-FG:2.5KVDC
ISOLATION RESISTANCE
I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION
Compliance to BS EN/EN55032 (CISPR32) Conduction Emission: Class A, Radiation Emission: Class B, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,5,6,8, BS EN/EN55035, light industry level, EAC TP TC 020
RAILWAY STANDARD
BS EN/EN50155 / IEC60571 including IEC61373 for shock & vibration,BS EN/EN50121-3-2 for EMC;BS EN/EN45545-2 for fire protection

OTHERS

MTBF
1850.1K hrs min. Telcordia SR-332 (Bellcore) ; 130.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
216*96.5*40mm (L*W*H)
PACKING
1.19Kg ; 12pcs/15.3Kg/0.97CUFT
Test conditions and notes6
  1. 1. All parameters NOT specially mentioned are measured at 24,48VDC input, rated load and 25℃ of ambient temperature.
  2. 2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1μF & 47μF parallel capacitor.
  3. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. Strongly recommended that external output capacitance should not exceed 5000uF. (Only for: RSD-300-5 / -12)
  5. 5. The power supply is considered a component which will be installed into a final equipment. All the EMC tests are been executed by mounting the unit on a 360mm*360mm metal plate with 1mm of thickness. The final equipment must be re-confirmed that it still meets EMC directives. For guidance on how to perform these EMC tests, please refer to “EMI testing of component power supplies.” (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf )
  6. 6. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).

Technical drawings

RSD-300B-48 Mechanical Specification
Mechanical Specification
RSD-300B-48 Block Diagram
Block Diagram
RSD-300B-48 Input Under-Voltage Protection
Input Under-Voltage Protection
RSD-300B-48 Hold-up Time
Hold-up Time
RSD-300B-48 Efficiency vs Load & Vin Curve
Efficiency vs Load & Vin Curve
RSD-300B-48 RSD-300E-5
RSD-300E-5
RSD-300B-48 RSD-300E-48
RSD-300E-48
RSD-300B-48 Parallel and Series Connection
Parallel and Series Connection
RSD-300B-48 supplier if you have this kind of application.
supplier if you have this kind of application.
RSD-300B-48 supplier if you have this kind of application. (2)
supplier if you have this kind of application. (2)
RSD-300B-48 Overload Protection
Overload Protection
RSD-300B-48 Derating Curve
Derating Curve
RSD-300B-48 R S D - 3 0 0 series
R S D - 3 0 0 series
RSD-300B-48 R S D - 3 0 0 series (2)
R S D - 3 0 0 series (2)
RSD-300B-48 LOAD(%)
LOAD(%)
RSD-300B-48 Immunity to Environmental Conditions
Immunity to Environmental Conditions

Downloads

FAQ

Can I use the RSD-300B-48 to run 48V telecom or industrial communication equipment from a lower-voltage DC source?

Yes, it accepts 16.8~31.2V input and provides a constant-voltage 48V output. It supports up to 5.7A and 273.6W, which suits many 48V communication and control loads.

Is this converter suitable for 48V radios, gateways, or network edge hardware on mobile platforms?

It is designed for regulated 48V output applications that stay within 5.7A and 273.6W. The specs list 5G vibration resistance and operation at -40C to +55C full load, up to +70C at 60% load or at full load with an external base plate.

Can the RSD-300B-48 power 48V automation devices in industrial equipment?

Yes, as long as the DC input is within 16.8~31.2V and the total 48V load remains within 5.7A and 273.6W. Its constant-voltage 48V output fits equipment that expects a fixed 48V supply.

Can I size this model for multiple 48V loads on the same system?

You can, but the combined load must stay within 5.7A and 273.6W at 48V output. That makes it better suited to moderate 48V loads rather than higher-current 48V distribution.

How well does the RSD-300B-48 handle harsh environments?

The specified operating range is -40C to +55C at full load, up to +70C at 60% load by free-air convection, or +70C at full load with an external base plate, and the specs list 5G vibration resistance. No IP rating is provided, so the specs do not define outdoor sealing or ingress protection.

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Mean Well RSD-300B-48 DC-DC Converter - 200.4W - 16.8~31.2V in 48V out 5.7A
Mean Well

Mean Well RSD-300B-48 DC-DC Converter - 200.4W - 16.8~31.2V in 48V out 5.7A

Log in to see price

RSD-300B-48 is the 48V output model of this series: rated current 5.7A, rated power 273.6W, typical efficiency 91.5%.

Features

  • Compliance to BS EN/EN50155 and BS EN/EN45545-2 railway standard
  • 2:1 wide input range
  • Protections: Short circuit / Overload / Over voltage / Over temperature / Input reverse polarity
  • 4000VDC I/O isolation
  • Cooling by free air convection
  • Half encapsulated
  • Built-in constant current limiting circuit
  • 1U low profile 40mm
  • All using 105℃ long life electrolytic capacitors
  • LED indicator for power on
  • 100% full load burn-in test
  • 3 years warranty
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