MEAN WELL Power Supply MDR-20 Series Single Output DIN Rail Mounted

Product Item : MDR-20 series
Category：DIN Rail Power Supplies
Wattage: 20W
Input Voltage: 85 ~ 264VAC or 120 ~ 370VDC
Output Current: 0 ~ 3A
Output Voltage: 5 ~ 24V
Product description：he Mean Well MDR-20 is a compact 20W DIN-rail power supply with universal AC input for industrial control. It features high efficiency and built-in protection in an ultra-slim design.
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MDR-20 Series - 20W Ultra-Slim DIN Rail Power Supply (22.5mm, DC OK, Voltage Adjust, CC Overload)

✓ In Stock 3-Year DC OK Signal V-Adjustable CC Overload UL508/BIS

				Key Performance at a Glance
			
						24W
					
						Max Power (24V)
					
						84%
					
						Max Efficiency
					
						22.5mm
					
						Ultra-Slim Width
					
						50ms
					
						Hold-up (230V)
					
						160%
					
						CC Overload Ceiling
					
						DC OK
					
						Active Signal

Product Overview

The MDR-20 series is the 20W upgrade to the MDR-10 platform -- same 22.5mm ultra-slim metal chassis with three critical enhancements over its 10W sibling: adjustable output voltage (via front-panel potentiometer), constant-current overload up to 160% (vs hiccup mode on MDR-10), and higher output power with 24V delivering 24W (exceeding the 20W series rating). The active DC OK signal, UL508/BIS certifications, and 22.5mm form factor carry forward unchanged.

The MDR-20 accepts universal 85~264Vac input (120~370Vdc) with 0.55A/115V, 0.35A/230V AC current and 20A/115V, 40A/230V cold-start inrush (lower than MDR-10's 35A/70A). Four voltages: 5V (3A/15W), 12V (1.67A/20W), 15V (1.34A/20W), and 24V (1A/24W). The 5V model is rated at 15W due to thermal limits at low voltage; 24V exceeds the series rating at 24W. Efficiency ranges from 76% at 5V to 84% at 24V. Hold-up time is 50ms at 230Vac -- shorter than the MDR-10's 120ms but trade-off for the higher power output. No-load consumption remains <0.75W.

The voltage adjust feature is the headline upgrade: each model has a front-panel potentiometer with meaningful adjustment range (4.75~5.5V, 10.8~13.2V, 13.5~16.5V, 21.6~26.4V). The overload protection switches from MDR-10's hiccup mode to constant-current limiting (105~160%) -- ideal for motor starts, capacitive loads, and battery charging that would trip a hiccup-mode supply. Both OLP and short-circuit protection auto-recover when the fault clears. OVP triggers output shutdown requiring a restart.

All other platform features are identical to MDR-10: metal chassis with FG connection required, 3KVac I/P-O/P isolation, Class B EMC with EN61000-6-1 light industrial immunity, and full global certifications (UL508, TUV BS EN/EN62368-1, EAC, BSMI, AS/NZS 62368.1, BIS IS13252). At 22.5x90x100mm and 170g, with 72 units per carton. 3-year warranty with 100% full-load burn-in test.

Product Images

Technical Specifications

All models feature front-panel voltage adjust and 105~160% constant-current overload. Note: 5V = 15W, 24V = 24W.

Parameter	MDR-20-5	MDR-20-12	MDR-20-15	MDR-20-24
DC Output Voltage	5V	12V	15V	24V
Rated Current	3A	1.67A	1.34A	1A
Rated Power	15W	20W	20W	24W
Ripple & Noise (max)	80mVp-p	120mVp-p	120mVp-p	150mVp-p
Voltage Adj Range	4.75~5.5V	10.8~13.2V	13.5~16.5V	21.6~26.4V
Voltage Accuracy	+/-2.0%	+/-1.0%	+/-1.0%	+/-1.0%
Line / Load Regulation	+/-1.0% / +/-1.0%	+/-1.0% / +/-1.0%	+/-1.0% / +/-1.0%	+/-1.0% / +/-1.0%
Efficiency (Typ.)	76%	80%	81%	84%
Overload (CC mode)	105~160%	105~160%	105~160%	105~160%
OVP Threshold	5.75~6.75V	13.8~16.2V	17.25~20.25V	27.6~32.4V
DC OK Signal (max)	3.75~6V / 50mA	9~13.5V / 40mA	11.5~16.5V / 40mA	18~27V / 20mA

Input & Features (All Models)

Input Voltage Range	85~264Vac or 120~370Vdc; 47~63Hz
AC Current / Inrush / No-Load	0.55A/115V, 0.35A/230V \| 20A/115V, 40A/230V (cold start) \| <0.75W
Leakage Current	<1mA / 240Vac
Hold-up / Start-up	50ms/230V, 20ms/115V \| 500ms/30ms@230V, 1000ms/30ms@115V (cold start)
Overload Protection	105~160% Constant-Current limiting -- auto-recovery after fault removal (CC mode for motor starts vs hiccup on MDR-10)
OVP / SC	OVP: shutdown output, restart to recover \| SC: auto-recovery
DC OK Signal	Active sourcing output -- drives external LED, relay, or PLC digital input (see per-model limits). Same pinout as MDR-10.
Operating / Storage Temp	-20~+70C (derating curve), 20~90% RH \| -40~+85C, 10~95% RH
Temp Coefficient / Vibration	+/-0.03%/C (0~50C) \| 2G, 10~500Hz, IEC60068-2-6
Altitude / Overvoltage Cat.	2,000m (derate 3.5C/1000m above) \| OVC: not specified in datasheet
Safety Standards	UL508, TUV BS EN/EN62368-1, EAC TP TC 004, BSMI CNS15598-1, AS/NZS 62368.1, BIS IS13252(Part1)/IEC60950-1
Isolation	I/P-O/P: 3KVac \| I/P-FG: 2KVac \| O/P-FG: 0.5KVac \| All: >100Mohm/500Vdc/25C/70% RH
EMC Emissions / Immunity	BS EN/EN55032(CISPR32) Class B, CNS15936 Class B, EN61000-3-2,-3 \| EN61000-6-1 light industrial, EAC TP TC 020
MTBF / Dimensions / Weight	2,780.8K hrs (Telcordia SR-332); 236.9K hrs (MIL-HDBK-217F, 25C) \| 22.5 x 90 x 100mm / 0.17kg / 72pcs per carton / 13.2kg

Key Features

Adjustable Output Voltage -- Front-Panel Pot
First MDR model with user-adjustable voltage via front-panel potentiometer -- trim 4.75~5.5V, 10.8~13.2V, 13.5~16.5V, or 21.6~26.4V for cable loss compensation and load matching. Major upgrade over fixed-output MDR-10.

CC Overload 160% -- Motor & Capacitive Load Friendly
Constant-current limiting to 160% rated power handles motor starts, solenoid inrush, and capacitive charging -- won't trip out like hiccup-mode MDR-10. Auto-recovery when load drops below threshold.

24W at 24V -- Exceeds Series Rating
24V model delivers 24W (1A) -- 20% above the 20W series rating, 2.4x the MDR-10-24's 10W. Most power-dense 24V in a 22.5mm DIN rail supply.

Same 22.5mm + DC OK -- Same Pinout as MDR-10
Identical form factor and terminal layout to MDR-10 with same active DC OK signal -- drop-in upgrade for 2x power with adjustable voltage and motor-friendly CC overload

Lower Inrush (20A/40A) + Global Certifications
43% lower inrush current than MDR-10 (20A vs 35A at 115V) -- easier on upstream breakers. UL508, BIS, BSMI, EAC, AS/NZS for worldwide deployment.

100% Burn-in + 3-Year Warranty
Every unit undergoes full-load burn-in testing with 2,780K hrs MTBF -- 2x the power of MDR-10 in the same 22.5mm footprint with full industrial reliability.

Frequently Asked Questions

How does MDR-20 compare to MDR-10?

MDR-20 doubles power (20W/24W vs 10W) in the same 22.5mm chassis with three key upgrades: (1) Adjustable voltage via front-panel potentiometer -- MDR-10 is fixed; (2) CC overload 160% -- MDR-10 uses hiccup mode which trips on motor starts; (3) 24V delivers 24W (1A vs 0.42A). Trade-off: hold-up drops to 50ms (vs 120ms). Same DC OK signal, same certifications, same weight. Choose MDR-20 when you need 2x power with voltage trim; choose MDR-10 for longest hold-up or lowest-cost 10W.

Why does the 5V model only deliver 15W?

At 5V output, the 3A current limit results in 15W. This is a thermal limitation of the platform at very low output voltages -- the same phenomenon seen in HDR-30-5 (15W) and HDR-60-5 (32.5W). The 12V, 15V, and 24V models deliver their full rated power of 20W (or 24W for 24V).

How does CC overload differ from MDR-10's hiccup mode?

Hiccup mode (MDR-10): when overloaded, the supply repeatedly turns off and on -- safe for electronics but problematic for motors and capacitive loads that need sustained current to start. Constant-Current mode (MDR-20): limits output current to 105~160% of rated value, allowing voltage to sag but maintaining current flow -- ideal for motor starts, battery charging, and capacitive loads. Both modes auto-recover when the overload is removed.

Can I drop MDR-20 into an existing MDR-10 installation?

Yes. MDR-20 uses the identical 22.5x90x100mm form factor, the same TS-35 DIN rail mount, the same terminal assignment (N/L/FG/DC OK/+V/-V), and the same DC OK signal characteristics per voltage. It is a true drop-in upgrade for MDR-10 installations that need more power, voltage adjustment, or CC overload behaviour.