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Mean Well

Mean Well RSD-300D-12 DC - DC Converter 300W 12V 22.5A

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

RSD-300D-12 is the 12V output model of this series: rated current 25A, rated power 300W, 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-12Specifications from the official datasheet (2025-07-18 edition)

OUTPUT

DC VOLTAGE
12V
RATED CURRENT
25A
CURRENT RANGE
0 ~ 25A
RATED POWER
300W
RIPPLE & NOISE (max.)Note.2
120mVp-p
VOLTAGE TOLERANCENote.3
±2.0%
LINE REGULATION
±0.2%
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
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 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-12 Mechanical Specification
Mechanical Specification
RSD-300D-12 Block Diagram
Block Diagram
RSD-300D-12 Input Under-Voltage Protection
Input Under-Voltage Protection
RSD-300D-12 Hold-up Time
Hold-up Time
RSD-300D-12 Efficiency vs Load & Vin Curve
Efficiency vs Load & Vin Curve
RSD-300D-12 RSD-300E-5
RSD-300E-5
RSD-300D-12 RSD-300E-48
RSD-300E-48
RSD-300D-12 Parallel and Series Connection
Parallel and Series Connection
RSD-300D-12 supplier if you have this kind of application.
supplier if you have this kind of application.
RSD-300D-12 supplier if you have this kind of application. (2)
supplier if you have this kind of application. (2)
RSD-300D-12 Overload Protection
Overload Protection
RSD-300D-12 Derating Curve
Derating Curve
RSD-300D-12 R S D - 3 0 0 series
R S D - 3 0 0 series
RSD-300D-12 R S D - 3 0 0 series (2)
R S D - 3 0 0 series (2)
RSD-300D-12 LOAD(%)
LOAD(%)
RSD-300D-12 Immunity to Environmental Conditions
Immunity to Environmental Conditions

Downloads

FAQ

Can I use the RSD-300D-12 to power a 12V industrial control system from a 67 to 143V DC source?

Yes. The RSD-300D-12 is a constant-voltage DC-DC converter with a 67.2 to 143VDC input range and a 12V output. Its 300W and 25A rating suits 12V control loads that stay within those limits.

Is this converter suitable for 12V embedded computers or automation electronics in higher-voltage DC equipment?

It can be a fit when the source bus is 67.2 to 143VDC and the equipment needs regulated 12V. The available output is 25A with 300W total power, which supports heavier 12V embedded and automation loads within that range.

Would the RSD-300D-12 work in rail, vehicle, or mobile industrial systems with vibration?

Yes, the listed features include 5G vibration resistance and compliance with railway standards (EN50155, IEC61373), which aligns with mobile or vibration-prone industrial environments. It provides 12V constant-voltage output and is rated for 300W with up to 25A output current.

Can I use this model for 12V industrial communications or monitoring equipment on a high-voltage DC bus?

Yes, if the downstream equipment requires 12V constant-voltage power and remains within 25A and 300W. The 67.2 to 143VDC input range is useful where the upstream DC bus is substantially higher than the load voltage.

Is the RSD-300D-12 appropriate for outdoor or high-temperature locations?

The operating temperature 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 published specs do not confirm outdoor exposure or washdown suitability.

How does the RSD-300D-12 compare with the other RSD-300D variants listed?

The RSD-300D-12 is rated at 300W, 12V, and 25A. Other variants in the RSD-300D series include the RSD-300D-5 (210W, 5V, 42A), RSD-300D-24 (300W, 24V, 12.5A), and RSD-300D-48 (302.4W, 48V, 6.3A). The provided sibling data shows different output voltages, currents, and wattage figures across the group.

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Mean Well RSD-300D-12 DC - DC Converter 300W 12V 22.5A
Mean Well

Mean Well RSD-300D-12 DC - DC Converter 300W 12V 22.5A

Log in to see price

RSD-300D-12 is the 12V output model of this series: rated current 25A, rated power 300W, 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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