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Mean Well RD-85B Power Supply 85W 5V 24V 8A
Overview
RD-85B is the model of this series: rated power 88W, typical efficiency 80%.
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
OUTPUT
- OUTPUT NUMBER CH1
- CH1
- OUTPUT NUMBER CH2
- CH2
- DC VOLTAGE CH1
- 5V
- DC VOLTAGE CH2
- 24V
- RATED CURRENT CH1
- 8A
- RATED CURRENT CH2
- 2A
- CURRENT RANGE CH1Note.3
- 0 ~ 10A
- CURRENT RANGE CH2Note.3
- 0 ~ 2.5A
- 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.)
- 80%
- 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. All parameters NOT specially mentioned are measured at 230VAC input, rated load and 25℃ of ambient temperature.
- 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. 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. Line regulation is measured from low line to high line at rated load.
- 5. Load regulation is measured from 20% to 100% rated load, and other output at 60% rated load.
- 6. Each output can work within current range. But total output power can't exceed rated output power.
- 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. 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. 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
Downloads
FAQ
Can I use the RD-85B in a control panel that needs both 5V logic power and 24V auxiliary power?
This model is built as a dual output power supply, with 5V listed in the core specs and 24V called out in the product name. Its 88W rating and 8A output current on the 5V rail make it more suitable for mixed low-voltage control and auxiliary applications than a single-output unit.
Is the RD-85B a fit for embedded or industrial electronics that run on 5V?
It can fit 5V embedded or industrial electronics that need a constant voltage supply rather than a variable output design. The unit provides 5V at up to 8A with 88W total power, which suits higher-current low-voltage loads better than smaller dual-output models in the same series.
Can the RD-85B be used in automation equipment with wide AC input conditions?
It is designed for a wide 88-264VAC input range, which is useful in automation equipment that may be deployed across different AC supply conditions. That makes it easier to use in equipment platforms that need the same power supply across multiple regions or facility standards.
Is the RD-85B suitable for vibration-prone equipment cabinets or machine enclosures?
The listed features include 5G vibration resistance, so it is better aligned with machinery or equipment cabinets that see mechanical movement than a basic bench-only supply. Its miniature size of 159.0 × 97.0 × 38.0 mm also helps where panel space is limited.
What is the difference between the RD-85B and the other RD series dual-output models?
The RD-85B is a dual-output model providing 5V at 8A and 24V at 2A for a total of 88W. It differs from the RD-85A, which provides 5V at 8A and 12V at 4A. Other models in the series, such as the RD-125 variants, offer higher power ratings and different voltage combinations.
Can the RD-85B be used outdoors or in harsh temperature conditions?
The operating temperature range is -25°C to +70°C, so it is specified for a broad temperature span. No IP rating is provided in the supplied specs, so the product data does not describe it as an outdoor-exposed power supply.
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