MEAN WELL
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24VDC Power Supplies for Industrial Automation and Control Panels
MEAN WELL 24VDC power supplies for PLCs, sensors, actuators and control cabinets: slim DIN rail units from 15 W to 960 W, three-phase input models, DC-UPS and DC-DC modules, and enclosed panel-mount supplies.
- 24VDCThe standard control voltage for PLC I/O, sensors and relays
- 15 W โ 960 WDIN rail models on this page, single and higher power
- UL 508 ยท Class I Div 2Only on the models whose datasheet lists it (see below)
Step 1
Choosing a 24VDC supply for PLCs, sensors and actuators
Add up the continuous current of everything on the 24V bus: PLC CPU and I/O modules, sensors, relays, solenoid valves, HMI and network devices. Then check the inrush or peak current of coils, valves and capacitive loads, and keep 20โ30% headroom so the supply runs at about 80% of its rating.
Several series handle short peaks above their rating: for example, the SDR-480 datasheet lists 720 W peak for 3 seconds. Check the PEAK CURRENT line of the datasheet before relying on it.
Total load (W) = sum of device currents (A) ร 24 V
Minimum supply (W) = total load รท 0.8
Peaks: check inrush of coils and valves against the supply peak rating
15 โ 156 W
DIN rail power supplies by width and wattage
Compact single-phase 24V units for small panels and distribution boxes. HDR has an ultra-slim step shape, MDR is a compact general-purpose series, EDR is the economy line and NDR the slim workhorse for machine panels.
View all HDR models โView all MDR models โView all EDR models โView all NDR models โ
240 โ 960 W
Higher-power 24VDC DIN rail: 240 W to 960 W
For larger machines and motion panels: NDR, SDR (active PFC, DC OK relay and peak power capability) and the ultra-slim XDR / XDR-E series.
View all SDR models โView all XDR-E models โView all DIN rail power supplies โ
Input
Single-phase vs three-phase input (WDR, TDR, XTR)
Most panels feed the 24V supply from a single-phase 100โ240 VAC circuit. If the cabinet only has a 400/480 VAC three-phase supply, or the 24V load is large, use a wide-input or three-phase model:
- WDR: 180โ550 VAC input on the models below, for panels without a neutral or 120/230 V tap (check the wiring diagram in the datasheet).
- TDR: three-phase 340โ550 VAC input (TDR-480 datasheet, dual-phase operation possible).
- XTR: three-phase 320โ600 VAC wide-range input (dual-phase operation possible), for 480 W and 960 W loads.
View all WDR models โView all TDR models โView all XTR models โ
Uptime
Redundancy and parallel operation
Two ways to keep a 24V bus running when one supply fails or you need more power:
N+1
Redundancy module
Two supplies feed a redundancy module such as the DR-RDN20 (two 21โ28 V inputs, 20 A per input, input OK LEDs). If one supply fails, the other carries the load.
Parallel
Current sharing
Only connect supplies in parallel when the datasheet allows it. For example, the DDR-240 datasheet allows up to 4 units in parallel and current sharing up to 960 W (3+1).
Ask us
Larger systems
DRP-3200 rack-mountable front end rectifier systems are quoted per project. Tell us the load, redundancy level and input.
Backup
DC-UPS and battery backup in panels
A DC-UPS keeps the PLC, HMI and network alive through short outages. The DRS-240 combines a 24V supply, battery charger and DC UPS function, with AC fail and battery low signals for the PLC. DRC and DR-UPS series are available by quote.
Battery-fed panels can use a DIN rail DC-DC converter: DDR-120A-24 runs from a 12V battery (9โ18 V input) and DDR-240C-24 from a 48V battery (33.6โ67.2 V input).
View all DRC models โView all DRS models โView all DDR models โ
Panel mount
Enclosed panel-mount alternatives (LRS, RSP, UHP)
When there is back-panel space instead of DIN rail, enclosed supplies give more watts per dollar. LRS covers 35 W to 1200 W, RSP adds PFC for higher-power panels, and the slim UHP series is available by quote.
View all LRS models โView all RSP-75~500 models โView all UHP models โ
Certifications to look for
| Listing | What it covers | Series on this page whose datasheet lists it |
|---|---|---|
| UL 508 | Industrial control equipment | HDR-15, HDR-60, MDR, EDR, NDR, SDR, WDR, TDR-480 |
| UL 61010-1 | Electrical equipment for measurement, control and lab use | HDR-150, XDR / XDR-E |
| Class I, Division 2 | Hazardous locations (North America) | MDR-40, MDR-60, XDR-120 |
| SEMI F47 | Voltage sag immunity (semiconductor tools) | SDR-120, SDR-240, SDR-480, XDR-120 |
| UL 62368-1 | Audio/video and IT equipment safety | LRS, RSP-320, DRS-240, DDR |
Listings are taken from each series datasheet and can vary by model and output voltage. Always confirm on the datasheet linked from the product page.
Compare 24V DIN rail series
| Series | 24V power (models on this page) | AC input (product specs) | Best for |
|---|---|---|---|
| HDR | 15โ127 W | 85โ264 VAC | Slim step shape for distribution boxes |
| MDR | 24โ96 W | 85โ264 VAC | Compact general-purpose panels |
| EDR | 75โ156 W | 90โ264 VAC | Economy single-phase |
| NDR | 75โ480 W | 90โ264 VAC | Slim machine panels |
| SDR | 120โ480 W | 88โ264 VAC | PFC, peak power, DC OK relay |
| XDR / XDR-E | 120โ960 W | 85โ305 VAC (XDR-120) | Ultra slim, high power |
| WDR | 120โ240 W | 180โ550 VAC | 400/480 VAC panels |
Figures are for the 24V models listed on this page. Confirm full specs on the datasheet linked from each product page.
Related resources
DIN rail power suppliesThe full MEAN WELL DIN rail range.โXDR-E series overviewUltra-slim 75โ960 W DIN rail.โTDR seriesThree-phase input DIN rail.โDC/DC DIN railDDR converters for battery-fed panels.โSecurity & UPS-function suppliesDRS DC-UPS series.โHow to choose a MEAN WELL power supplyStep-by-step selection guide.โFind your MEAN WELL power supplySearch by voltage, wattage and type.โRequest a quoteProject and volume quantities.โ
24VDC power supply FAQs
What size 24VDC power supply do I need for a PLC?
Add the continuous current of the PLC, I/O, sensors and outputs, multiply by 24 V and divide by 0.8. Example: 0.5 A CPU + 1.5 A I/O + 1 A sensors + 2 A valves = 5 A ร 24 V = 120 W, so choose at least 150 W, such as the EDR-150-24 or XDR-150E-24. Check inrush of coils and valves against the supply peak rating.
What's the difference between NDR, SDR, EDR and HDR?
HDR is ultra slim with a step shape for distribution boxes (15โ150 W). EDR is the economy line. NDR is a slim general-purpose series up to 480 W. SDR has active PFC, a DC OK relay and peak power capability for demanding loads. All four are DIN rail mount; see the comparison table above.
Can I connect two DIN rail power supplies in parallel for redundancy?
For redundancy, use a redundancy module such as the DR-RDN20 between two supplies, so one can fail without dropping the 24V bus. Connect outputs directly in parallel only when the datasheet allows it, for example the DDR-240 (up to 4 units).
Do I need a three-phase DIN rail power supply?
Only if the cabinet has no single-phase supply or you need a large 24V load from a 400/480 VAC feed. WDR models accept 180โ550 VAC, and the TDR-480 datasheet lists three-phase 340โ550 VAC input.
How do I add battery backup (DC-UPS) to a control panel?
Use a supply with a DC UPS function such as the DRS-240-24, which charges the battery and switches to it when AC fails, and sends AC fail and battery low signals to the PLC. Size the battery for the backup time you need.
What does Class I Division 2 mean for a power supply?
It is a North American hazardous-location classification for areas where flammable gases or vapors are present only under abnormal conditions. Use only models whose datasheet lists it, such as the MDR-40, MDR-60 and XDR-120 on this page.
24V vs 12V vs 48V in automation, which should I use?
24VDC is the standard for PLC I/O, sensors and relays. 12V suits small panels and some instruments. 48V halves the current of 24V for the same power, which helps with long cable runs and higher-power drives.
Need help choosing?
Send us your panel load list (current per device and input voltage) at sales@htdelectronics.com, or request a quote for project quantities.