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Mean Well

Mean Well RD-125-1248 AC-DC Dual output enclosed power supply 125W 2.3A

miniature sizeeconomicalwithstand 5G vibration and 70°C operationdual output
SKU RD-125-1248
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RD-125-1248
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Overview

RD-125-1248 is the 12V / 48V output model of this series: rated current 2.3A / 2.3A, rated power 138W, typical efficiency 86%.

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-125-1248Specifications from the official datasheet (2025-12-19 edition)

OUTPUT

OUTPUT NUMBER
CH1 / CH2
DC VOLTAGE
12V / 48V
RATED CURRENT
2.3A / 2.3A
CURRENT RANGENote.3
0 ~ 7A / 0 ~ 2.5A
RATED POWERNote.6
138W
RIPPLE & NOISE (max.)Note.2
120mVp-p / 240mVp-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.)
86%
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-125-1248 Mechanical Specification
Mechanical Specification
RD-125-1248 Block Diagram
Block Diagram
RD-125-1248 Derating Curve
Derating Curve

Downloads

FAQ

Can I use the RD-125-1248 for a compact 12V industrial controller that also needs a second output?

Yes, this is a 138W enclosed AC-DC power supply with dual output and a listed 12V output rated at 2.3A. Its 199.0 × 98.0 × 38.0 mm form factor suits tighter control boxes where space is limited. The 88-132VAC / 176-264VAC input range (selected by switch) defines the AC source window for this model.

Is the RD-125-1248 a fit for embedded systems or instrumentation built around a 12V rail?

It can be used where the design calls for a 12V output at 2.3A within a 138W enclosed supply platform. The dual output design can also be relevant when the equipment needs more than one DC rail from one power supply. Its compact size and 0.59 kg weight support use in smaller enclosures.

Can this model support light-duty automation panels in environments with vibration?

The feature set states it withstands 5G vibration and operates up to +70°C, which makes it more suitable for equipment environments than a basic office-only supply. The listed 12V output is 2.3A, so it is aimed at lighter 12V loads than the 3.7A RD-125-1224. Total rated power is 138W.

Is the RD-125-1248 suitable for outdoor applications?

The published operating temperature range is -25°C to +70°C, so the model is specified for a broad indoor operating range. No IP rating is listed in the provided specs, which means the outdoor ingress-protection level is not established here. The environmental data provided is the temperature range plus 5G vibration resistance.

How does the RD-125-1248 compare with nearby RD series options?

Compared with the other 125W entries listed here, RD-125-1224 is 125W 12V 3.7A, this RD-125-1248 is 125W 12V 2.3A, and RD-125-2448 is 125W 24V 2A. Other provided RD siblings include RD-125A at 130.9W 5V 7.7A, RD-125B at 133.4W 5V 4.6A, RD-3513 at 35.1W 13.5V 1.3A, RD-35A at 32W 5V 4A, RD-35B at 35W 5V 2.2A, RD-50A at 54W 5V 6A, RD-50B at 53.6W 5V 4A, RD-65A at 66W 5V 6A, RD-65B at 68W 5V 4A, and RD-85A and RD-85B at 88W 5V 8A. RD-125-2412, RD-125-4812, RD-125-4824, RD-125A-OB, RD-125NB, and RD-65A-OB are listed without full specs in the provided data.

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Mean Well RD-125-1248 AC-DC Dual output enclosed power supply 125W 2.3A
Mean Well

Mean Well RD-125-1248 AC-DC Dual output enclosed power supply 125W 2.3A

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RD-125-1248 is the 12V / 48V output model of this series: rated current 2.3A / 2.3A, rated power 138W, typical efficiency 86%.

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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