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Mean Well

Mean Well RD-125A Power Supply 125W 5V 12V 7.7A

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

RD-125A is the CH1: 5V / CH2: 12V output model of this series: rated current CH1: 7.7A / CH2: 7.7A, rated power 130.9W, typical efficiency 82%.

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

OUTPUT

OUTPUT NUMBER
CH1 / CH2
DC VOLTAGE
CH1: 5V / CH2: 12V
RATED CURRENT
CH1: 7.7A / CH2: 7.7A
CURRENT RANGENote.3
CH1: 0 ~ 12A / CH2: 0 ~ 10A
RATED POWERNote.6
130.9W
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.)
82%
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-125A Mechanical Specification
Mechanical Specification
RD-125A Block Diagram
Block Diagram
RD-125A Derating Curve
Derating Curve

Downloads

FAQ

Can I use the RD-125A in an industrial control cabinet that needs both 5V logic and 12V peripherals?

Yes. The RD-125A is a dual output constant voltage supply with 5V and 12V outputs, and the listed 5V output current is 7.7A. Its total rated power is 130.9W, so it fits control systems that need both voltage rails from one power supply.

Is the RD-125A suitable for embedded systems that combine a 5V controller with 12V auxiliary loads?

It is designed for dual output use where a system needs 5V and 12V from one unit. The supply provides a 5V output rated at 7.7A and a total power rating of 130.9W. That makes it a practical fit for embedded or automation hardware with separate low-voltage logic and 12V support loads.

Can the RD-125A be used in automation equipment exposed to vibration or higher internal cabinet temperatures?

Yes, the listed features include 5G vibration resistance and operation up to +70°C. The operating temperature range is -25°C to +70°C. Those specs make it appropriate for enclosed industrial equipment that sees vibration and elevated ambient temperatures.

Is the RD-125A for indoor or outdoor use?

These specs do not list an IP rating, so it should be treated as a power supply for indoor use or for installation inside a protected enclosure. Its operating temperature range is -25°C to +70°C, but that temperature rating does not by itself indicate outdoor exposure protection.

How does the RD-125A compare with other Mean Well RD dual output models?

Within the listed RD family, the RD-125A is 130.9W with a 5V 7.7A output. Other specified siblings are RD-125B at 133.4W with 5V 4.6A, RD-125-1224 at 133.2W with 12V 3.7A, RD-125-1248 at 138W with 12V 2.3A, RD-125-2448 at 144W with 24V 2A, RD-125-2412 with 24V 3.7A, RD-125-4812 with 48V 2.3A, and RD-125-4824 with 48V 2A.

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Mean Well RD-125A Power Supply 125W 5V 12V 7.7A
Mean Well

Mean Well RD-125A Power Supply 125W 5V 12V 7.7A

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RD-125A is the CH1: 5V / CH2: 12V output model of this series: rated current CH1: 7.7A / CH2: 7.7A, rated power 130.9W, typical efficiency 82%.

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 12V 5V
  • 50W 12V 5V
  • 65W 12V 5V
  • 85W 12V 5V
  • 125W 12V 5V
View product

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