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Mean Well RD-85A Power Supply 85W 5V 12V 8A

miniature sizeeconomicalwithstand 5G vibration and 70°C operationdual output
SKU RD-85A
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RD-85A
Available to order
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Overview

RD-85A is the model of this series: rated power 88W, typical efficiency 78%.

Features

  • Universal AC input / Full range
  • 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-85ASpecifications from the official datasheet (2024-11-22 edition)

OUTPUT

OUTPUT NUMBER CH1
CH1
OUTPUT NUMBER CH2
CH2
DC VOLTAGE CH1
5V
DC VOLTAGE CH2
12V
RATED CURRENT CH1
8A
RATED CURRENT CH2
4A
CURRENT RANGE CH1Note.3
0 ~ 10A
CURRENT RANGE CH2Note.3
0 ~ 5A
RATED POWERNote.6
88W
RIPPLE & NOISE (max.) CH1Note.2
80mVp-p
RIPPLE & NOISE (max.) CH2Note.2
120mVp-p
VOLTAGE ADJ. RANGE
CH1: 4.75 ~ 5.5V
VOLTAGE TOLERANCE CH1Note.3
±2.0%
VOLTAGE TOLERANCE CH2Note.3
±5.0%
LINE REGULATION CH1Note.4
±0.5%
LINE REGULATION CH2Note.4
±1.0%
LOAD REGULATION CH1Note.5
±1.0%
LOAD REGULATION CH2Note.5
±3.0%
SETUP, RISE TIME
500ms, 20ms/230VAC 1200ms, 30ms/115VAC at full load
HOLD UP TIME (Typ.)
100ms/230VAC 18ms/115VAC at full load

INPUT

VOLTAGE RANGE
88 ~ 264VAC 125 ~ 373VDC (Withstand 300VAC surge for 5sec. Without damage)
FREQUENCY RANGE
47 ~ 63Hz
EFFICIENCY(Typ.)
78%
AC CURRENT (Typ.)
2.5A/115VAC 1.5A/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 +5V output
VIBRATION
10 ~ 500Hz, 5G 10min./1cycle, period for 60min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS(Note 7)
UL62368-1, TUV BS EN/EN62368-1, EAC TP TC 004, BIS IS13252(Part1): 2010/IEC 60950-1:2005 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,-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
2897.3K hrs min. Telcordia SR-332 (Bellcore) ; 537.9K hrs min. MIL-HDBK-217F (25℃)
DIMENSION
159*97*38mm (L*W*H)
PACKING
0.6Kg; 24pcs/15.4Kg/0.83CUFT
Test conditions and notes9
  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 > 10% 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. 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-85A Mechanical Specification
Mechanical Specification
RD-85A Block Diagram
Block Diagram
RD-85A Derating Curve
Derating Curve

Downloads

FAQ

Can I use the RD-85A for a larger industrial control system with 5V logic and 12V auxiliary loads?

Yes, this dual output constant voltage model is rated for 88W total and provides a 5V output rated at 8A. That gives it more 5V current headroom than the 50W and 65W siblings. It is therefore better suited to larger control assemblies that still require regulated 5V along with a 12V rail.

Is the RD-85A suitable for embedded computing, industrial PCs, or HMI systems with higher 5V demand?

It can be a strong fit where the main requirement is a 5V constant voltage rail up to 8A. The 88W power rating places it above the lower-power RD models, which helps when the 5V load is heavier. Its 88-264VAC input also supports use in equipment intended for different AC supply ranges.

Can the RD-85A be used in machinery or automation equipment subject to vibration and heat?

This model is specified to withstand 5G vibration and to operate up to +70C, with a full operating range of -25C to +70C. Those specs make it suitable for industrial environments where enclosure temperature and vibration are selection factors. Its 5V 8A main output and 88W total rating should still be matched to the actual system load.

Is the RD-85A intended for indoor or outdoor applications?

The stated operating temperature range is -25C to +70C, which supports many indoor industrial environments. No IP rating is given in the supplied specs, so it should be treated as a unit for protected indoor use or installation inside suitable equipment enclosures rather than exposed outdoor use. Temperature capability alone does not make it outdoor rated.

What is the RD-85A's position relative to other RD series models?

The RD-85A is an 88W dual output model providing 5V at 8A and 12V at 4A. It sits above the RD-35 and RD-50 series in power capacity. Compared to the RD-85B, which provides 5V at 8A and 24V at 2A, the RD-85A offers higher current on the 12V rail. It is distinct from the RD-125 series, which offers higher total power ratings.

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Mean Well RD-85A Power Supply 85W 5V 12V 8A
Mean Well

Mean Well RD-85A Power Supply 85W 5V 12V 8A

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RD-85A is the model of this series: rated power 88W, typical efficiency 78%.

Features

  • Universal AC input / Full range
  • 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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