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Mean Well

Mean Well RSD-300D-48 DC - DC Converter 300W 48V 5.7A

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

RSD-300D-48 is the 48V output model of this series: rated current 6.3A, rated power 302.4W, 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-300D-48Specifications from the official datasheet (2025-07-18 edition)

OUTPUT

DC VOLTAGE
48V
RATED CURRENT
6.3A
CURRENT RANGE
0 ~ 6.3A
RATED POWER
302.4W
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
67.2 ~ 143VDC
VOLTAGE RANGE 1 SEC.
57.6 ~ 154VDC
EFFICIENCY (Typ.)
91.5%
DC CURRENT (Typ.)
3.1A/110V
INRUSH CURRENT (Typ.)
45A/110VDC
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 36,110VDC 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-300D-48 Mechanical Specification
Mechanical Specification
RSD-300D-48 Block Diagram
Block Diagram
RSD-300D-48 Input Under-Voltage Protection
Input Under-Voltage Protection
RSD-300D-48 Hold-up Time
Hold-up Time
RSD-300D-48 Efficiency vs Load & Vin Curve
Efficiency vs Load & Vin Curve
RSD-300D-48 RSD-300E-5
RSD-300E-5
RSD-300D-48 RSD-300E-48
RSD-300E-48
RSD-300D-48 Parallel and Series Connection
Parallel and Series Connection
RSD-300D-48 supplier if you have this kind of application.
supplier if you have this kind of application.
RSD-300D-48 supplier if you have this kind of application. (2)
supplier if you have this kind of application. (2)
RSD-300D-48 Overload Protection
Overload Protection
RSD-300D-48 Derating Curve
Derating Curve
RSD-300D-48 R S D - 3 0 0 series
R S D - 3 0 0 series
RSD-300D-48 R S D - 3 0 0 series (2)
R S D - 3 0 0 series (2)
RSD-300D-48 LOAD(%)
LOAD(%)
RSD-300D-48 Immunity to Environmental Conditions
Immunity to Environmental Conditions

Downloads

FAQ

Can I use the RSD-300D-48 for industrial equipment that needs the 48V version on a 67 to 143V DC input bus?

Yes. The product is identified as the RSD-300D-48 and is intended for high-voltage DC input from 67.2 to 143VDC. It is rated at 302.4W with 6.3A output current for constant-voltage applications within those stated limits.

Is this model suitable for telecom or networking hardware that uses the 48V version of the RSD-300D series?

It can be suitable where the equipment matches the output version of this model and stays within 6.3A and 302.4W. The converter is designed for a 67.2 to 143VDC input range and constant-voltage operation.

Would the RSD-300D-48 work in mobile or vibration-prone industrial platforms?

Yes. Its listed features include 5G vibration resistance, which supports use in moving machinery or transport-related equipment. The unit is also housed in a compact 216.0 × 96.5 × 40.0 mm form factor and weighs 1.19 kg.

Can this converter be used for higher-voltage DC systems that need a compact constant-voltage module?

Yes, when the source range is 67.2 to 143VDC and the load fits within the stated 302.4W and 6.3A output limits. Its compact size, 216.0 × 96.5 × 40.0 mm dimensions, and 1.19 kg weight can help where space is constrained.

Is the RSD-300D-48 suitable for outdoor or temperature-extreme environments?

The specified operating range is -40°C to +55°C (no derating), extending to +70°C at 60% load by free air convection. No IP rating is listed, so the available specs do not confirm protection for outdoor exposure.

How does the RSD-300D-48 compare with the other RSD-300D models?

The RSD-300D-48 is rated at 302.4W, 48V, and 6.3A. Other models in the RSD-300D series include the RSD-300D-5 (210W, 5V, 42A), RSD-300D-12 (300W, 12V, 25A), and RSD-300D-24 (300W, 24V, 12.5A). The versions differ by rated wattage and output specification.

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Mean Well RSD-300D-48 DC - DC Converter 300W 48V 5.7A
Mean Well

Mean Well RSD-300D-48 DC - DC Converter 300W 48V 5.7A

Log in to see price

RSD-300D-48 is the 48V output model of this series: rated current 6.3A, rated power 302.4W, 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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