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Mean Well

Mean Well RSD-300B-12 DC-DC Converter - 201.6W - 16.8~31.2V in 12V out 22.5A

miniature sizeeconomicalwithstand 5G vibration and 70°C operation
SKU RSD-300B-12
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Overview

RSD-300B-12 is the 12V output model of this series: rated current 22.5A, rated power 270W, typical efficiency 89.5%.

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-12Specifications from the official datasheet (2025-07-18 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
22.5A
CURRENT RANGE
0 ~ 22.5A
RATED POWER
270W
RIPPLE & NOISE (max.)Note.2
120mVp-p
VOLTAGE TOLERANCENote.3
±2.0%
LINE REGULATION
±0.3%
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.)
89.5%
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
13.8 ~ 16.2V 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-12 Mechanical Specification
Mechanical Specification
RSD-300B-12 Block Diagram
Block Diagram
RSD-300B-12 Input Under-Voltage Protection
Input Under-Voltage Protection
RSD-300B-12 Hold-up Time
Hold-up Time
RSD-300B-12 Efficiency vs Load & Vin Curve
Efficiency vs Load & Vin Curve
RSD-300B-12 RSD-300E-5
RSD-300E-5
RSD-300B-12 RSD-300E-48
RSD-300E-48
RSD-300B-12 Parallel and Series Connection
Parallel and Series Connection
RSD-300B-12 supplier if you have this kind of application.
supplier if you have this kind of application.
RSD-300B-12 supplier if you have this kind of application. (2)
supplier if you have this kind of application. (2)
RSD-300B-12 Overload Protection
Overload Protection
RSD-300B-12 Derating Curve
Derating Curve
RSD-300B-12 R S D - 3 0 0 series
R S D - 3 0 0 series
RSD-300B-12 R S D - 3 0 0 series (2)
R S D - 3 0 0 series (2)
RSD-300B-12 LOAD(%)
LOAD(%)
RSD-300B-12 Immunity to Environmental Conditions
Immunity to Environmental Conditions

Downloads

FAQ

Can I use the RSD-300B-12 to run 12V control accessories from a nominal 24V DC system?

Yes, this converter accepts 16.8~31.2V input and provides a constant-voltage 12V output. It can support loads up to 22.5A and 270W, which fits many 12V control accessories on lower-voltage DC platforms.

Is this converter a good fit for 12V mobile networking or surveillance equipment on industrial vehicles?

It is suited to 12V equipment that needs a regulated output and stays within 22.5A and 270W. 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 I use this for 12V embedded computers and HMI hardware in an automation cabinet?

Yes, if the cabinet uses a DC source within 16.8~31.2V and the combined 12V load does not exceed 22.5A or 270W. Its constant-voltage output is intended for equipment that expects a stable 12V rail.

Can one RSD-300B-12 support several 12V devices at the same time?

It can support multiple 12V devices as long as their total demand stays within 22.5A and 270W. Because it is a constant-voltage model, it is best used where all connected loads require 12V output.

Is the RSD-300B-12 suitable for outdoor or harsh-temperature locations?

The operating temperature 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; -40C to +85C is the storage range. No IP rating is listed in the provided specs, so outdoor exposure and enclosure protection are not defined by this data.

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Other RSD-300B Models

1 other model
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Mean Well RSD-300B-48 DC-DC Converter - 200.4W - 16.8~31.2V in 48V out 5.7A 273.6W 48V 5.7A IP20 View
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Mean Well RSD-300B-12 DC-DC Converter - 201.6W - 16.8~31.2V in 12V out 22.5A
Mean Well

Mean Well RSD-300B-12 DC-DC Converter - 201.6W - 16.8~31.2V in 12V out 22.5A

Log in to see price

RSD-300B-12 is the 12V output model of this series: rated current 22.5A, rated power 270W, typical efficiency 89.5%.

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
View product

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