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Mean Well

Mean Well RD-125-1224 AC-DC Dual output enclosed power supply 125W 3.7A

miniature sizeeconomicalwithstand 5G vibration and 70°C operationdual output
SKU RD-125-1224
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RD-125-1224
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Overview

RD-125-1224 is the 12V / 24V output model of this series: rated current 3.7A / 3.7A, rated power 133.2W, 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-125-1224Specifications from the official datasheet (2025-12-19 edition)

OUTPUT

OUTPUT NUMBER
CH1 / CH2
DC VOLTAGE
12V / 24V
RATED CURRENT
3.7A / 3.7A
CURRENT RANGENote.3
0 ~ 7A / 0 ~ 5A
RATED POWERNote.6
133.2W
RIPPLE & NOISE (max.)Note.2
120mVp-p / 200mVp-p
VOLTAGE ADJ. RANGE
CH1: 11.4 ~ 13.2V
VOLTAGE TOLERANCENote.3
±2.0% / ±8.0%
LINE REGULATIONNote.4
±0.5% / ±1.0%
LOAD REGULATIONNote.5
±1.0% / ±5.0%
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: 13.8 ~ 16.2V 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)(only for RD-125-1224), 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 > 5% 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-125-1224 Mechanical Specification
Mechanical Specification
RD-125-1224 Block Diagram
Block Diagram
RD-125-1224 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the RD-125-1224 in a small industrial control box that needs dual outputs?

Yes, this model is a 133.2W enclosed AC-DC power supply with a dual output design and a listed 12V output at 3.7A. Its 199 × 98 × 38 mm size can help where panel space is limited. The stated 88-132VAC / 176-264VAC input (selected by switch) also defines the AC range it is designed to accept.

Is the RD-125-1224 appropriate for embedded equipment or bench systems that use a 12V rail?

It can fit compact embedded or bench equipment that needs a 12V output and a total power class of 133.2W. The listed 12V output is rated at 3.7A, and the unit is enclosed rather than open-frame. Its 0.59 kg weight and compact size may also matter in smaller assemblies.

Can this dual output power supply be used in light automation or monitoring equipment?

For light-duty automation or monitoring equipment that uses a 12V rail, the RD-125-1224 provides 133.2W total power with a listed 12V output at 3.7A. The product is also specified to withstand 5G vibration and operate up to +70°C. Those details make it more relevant to enclosed equipment than a basic low-temperature bench-only supply.

Is the RD-125-1224 suitable for outdoor use or vibration-prone indoor environments?

The listed operating range is -25°C to +70°C, and the features state it can withstand 5G vibration. No IP rating is provided in the specs, so the available data does not establish an outdoor ingress-protection level. Based on the published data, temperature range and vibration resistance are specified, but an IP code is not.

How does the RD-125-1224 compare with the other RD family models listed here?

Among the provided siblings with full values, RD-125-1248 is 138W 12V 2.3A, RD-125-2448 is 144W 24V 2A, RD-125A is 130.9W 5V 7.7A, RD-125B is 133.4W 5V 4.6A, RD-3513 is 35.1W 13.5V 1.3A, RD-35A is 32W 5V 4A, RD-35B is 35W 5V 2.2A, RD-50A is 54W 5V 6A, RD-50B is 53.6W 5V 4A, RD-65A is 66W 5V 6A, RD-65B is 68W 5V 4A, and RD-85A and RD-85B are both 88W 5V 8A. RD-125-2412, RD-125-4812, RD-125-4824, RD-125A-OB, RD-125NB, and RD-65A-OB are listed as siblings without full power, voltage, or current values in the provided data.

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Mean Well RD-125-1224 AC-DC Dual output enclosed power supply 125W 3.7A
Mean Well

Mean Well RD-125-1224 AC-DC Dual output enclosed power supply 125W 3.7A

Log in to see price

RD-125-1224 is the 12V / 24V output model of this series: rated current 3.7A / 3.7A, rated power 133.2W, 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

  • 125W 12V 24V
  • 125W 12V 48V
  • 125W 48V 24V
View product

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