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Mean Well

Mean Well RD-125B Power Supply 125W 5V 24V 4.6A

miniature sizeeconomicalwithstand 5G vibration and 70°C operationdual output
SKU RD-125B
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RD-125B
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Overview

RD-125B is the CH1: 5V / CH2: 24V output model of this series: rated current CH1: 4.6A / CH2: 4.6A, rated power 133.4W, typical efficiency 85%.

Features

  • Protections: Short circuit / Overload / Over voltage
  • Cooling by free air convection
  • LED indicator for power on
  • 100% full load burn-in test
  • All using 105℃ long life electrolytic capacitors
  • Withstand 300VAC surge input for 5 second
  • High operating temperature up to 70℃
  • Withstand 5G vibration test
  • High efficiency, long life and high reliability
  • 3 years warranty

Specifications

RD-125BSpecifications from the official datasheet (2025-12-19 edition)

OUTPUT

OUTPUT NUMBER
CH1 / CH2
DC VOLTAGE
CH1: 5V / CH2: 24V
RATED CURRENT
CH1: 4.6A / CH2: 4.6A
CURRENT RANGENote.3
CH1: 0 ~ 10A / CH2: 0 ~ 5A
RATED POWERNote.6
133.4W
RIPPLE & NOISE (max.)Note.2
CH1: 80mVp-p / CH2: 120mVp-p
VOLTAGE ADJ. RANGE
CH1: 4.75 ~ 5.5V
VOLTAGE TOLERANCENote.3
CH1: ±5.0% / CH2: ±7.0%
LINE REGULATIONNote.4
CH1: ±1.0% / CH2: ±2.0%
LOAD REGULATIONNote.5
CH1: ±3.0% / CH2: ±4.0%
SETUP, RISE TIME
500ms, 20ms/230VAC 1200ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.)
25ms/230VAC 30ms/115VAC at full load

INPUT

VOLTAGE RANGE
88 ~ 132VAC / 176 ~ 264VAC selected by switch 248 ~ 373VDC(Withstand 300VAC surge for 5sec. Without damage)
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY (Typ.)
85%
AC CURRENT (Typ.)
3A/115VAC 2A/230VAC
INRUSH CURRENT (Typ.)
COLD START 50A/230VAC
LEAKAGE CURRENT
<2mA / 240VAC

PROTECTION

OVERLOAD
110 ~ 150% rated output power Protection type : Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE
CH1: 5.75 ~ 6.75V Protection type : Hiccup mode, recovers automatically after fault condition is removed

ENVIRONMENT

WORKING TEMP.
-25 ~ +70℃ (Refer to "Derating Curve")
WORKING HUMIDITY
20 ~ 90% RH non-condensing
STORAGE TEMP., HUMIDITY
-40 ~ +85℃, 10 ~ 95% RH
TEMP. COEFFICIENT
±0.03%/℃ (0 ~ 50℃)on CH1 output
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC (Note 7)

SAFETY STANDARDS
UL62368-1, TUV BS EN/EN62368-1, IS 13252(Part 1), EAC TP TC 004 approved
WITHSTAND VOLTAGE
I/P-O/P:3KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
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) Class B, BS EN/EN61000-3-2(Note 9),-3, EAC TP TC 020
EMC IMMUNITY
Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11, BS EN/EN55035, BS EN/EN61000-6-2 (BS EN/EN50082-2), heavy industry level, EAC TP TC 020

OTHERS

MTBF
2755.4K hrs min. Telcordia SR-332 (Bellcore) ; 425.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
199*98*38mm (L*W*H)
PACKING
0.59Kg; 20pcs/12.85Kg/0.85CUFT
Test conditions and notes10
  1. 1. All parameters NOT specially mentioned are measured at 230VAC 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.(In order to meet tolerance, it is recommended that CH1 load >15% rated current.)
  4. 4. Line regulation is measured from low line to high line at rated load.
  5. 5. Load regulation is measured from 20% to 100% rated load, and other output at 60% rated load.
  6. 6. Each output can work within current range. But total output power can't exceed rated output power.
  7. 7. 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 )
  8. 8. Length of set up time is measured at cold first start. Turning ON/OFF the power supply very quickly may lead to increase of the set up time.
  9. 9. Testing harmonic current at 85%load.
  10. 10.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

RD-125B Mechanical Specification
Mechanical Specification
RD-125B Block Diagram
Block Diagram
RD-125B Derating Curve
Derating Curve

Downloads

FAQ

Can I use the RD-125B for a control system that needs 5V electronics and 24V devices from one power supply?

Yes. The RD-125B is a dual output constant voltage supply with 5V and 24V outputs. The listed 5V output is rated at 4.6A, and total power is 133.4W, which suits systems that need both rails in one chassis supply.

Is the RD-125B a good fit for industrial automation panels with mixed 5V and 24V loads?

It is intended for dual output applications where 5V control electronics and 24V equipment are used together. The unit is rated for 133.4W total power and accepts 88-132VAC or 176-264VAC input selected by a switch. That makes it suitable for industrial and automation cabinets using selectable AC input.

Can the RD-125B handle embedded or machine subsystems in harsher enclosed environments?

Yes, the specifications list operation from -25°C to +70°C and resistance to 5G vibration. Those ratings support use in enclosed equipment where temperature swings and mechanical vibration are concerns. Its compact size of 199.0 x 98.0 x 38.0 mm also helps in tighter panel layouts.

Is the RD-125B rated for outdoor use?

No outdoor protection rating is listed in these specs. Because there is no stated IP rating, it should be used indoors or inside a protective enclosure. The operating temperature range is -25°C to +70°C, but that does not replace ingress protection.

What are the main differences between the RD-125B and other RD series models listed here?

The RD-125B is 133.4W with a listed 5V output current of 4.6A. Other specified siblings are RD-125A at 130.9W with 5V 7.7A, RD-3513 at 35.1W with 13.5V 1.3A, RD-35A at 32W with 5V 4A, RD-35B at 35W with 5V 2.2A, RD-50A at 54W with 5V 6A, RD-50B at 53.6W with 5V 4A, RD-65A at 66W with 5V 6A, RD-65B at 68W with 5V 4A, and RD-85A and RD-85B at 88W with 5V 8A.

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Mean Well RD-125B Power Supply 125W 5V 24V 4.6A
Mean Well

Mean Well RD-125B Power Supply 125W 5V 24V 4.6A

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RD-125B is the CH1: 5V / CH2: 24V output model of this series: rated current CH1: 4.6A / CH2: 4.6A, rated power 133.4W, typical efficiency 85%.

Features

  • Protections: Short circuit / Overload / Over voltage
  • Cooling by free air convection
  • LED indicator for power on
  • 100% full load burn-in test
  • All using 105℃ long life electrolytic capacitors
  • Withstand 300VAC surge input for 5 second
  • High operating temperature up to 70℃
  • Withstand 5G vibration test
  • High efficiency, long life and high reliability
  • 3 years warranty

Model

  • 35W 24V 5V
  • 125W 24V 5V
  • 50W 24V 5V
  • 65W 24V 5V
  • 85W 24V 5V
View product

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