5V 9V 12V Power Supply: No Electrolytic Capacitors
One unit, three output voltages — and zero electrolytic capacitors to wear out. A 20 W DIN‑rail supply engineered for decades of uninterrupted operation.
- 18 mm DIN rail width
- <50 mW standby power
- 0 electrolytic capacitors
Why engineers choose the HDR20‑5‑12
Zero electrolytic capacitors: no scheduled maintenance
Achieve maintenance‑free operation by eliminating the weakest link in standard power supplies. The HDR20‑5‑12’s NoElko design contains no aluminum electrolytic capacitors, so there’s nothing to dry out or degrade over time. The result: a supply that keeps running year after year, even in warm control cabinet environments.
The primary failure mode of switching power supplies is electrolytic capacitor dry‑out. By removing that component entirely, we designed a supply that can operate for decades without scheduled maintenance.
18 mm wide: pack more power into less rail
Free up valuable DIN rail space by using a supply that occupies just one modular slot. At only 18 mm wide, the HDR20‑5‑12 leaves more room for contactors, relays, and I/O modules — without sacrificing a watt of output power.
<50 mW standby: slash wasted energy in idle mode
Cut standby losses to virtually zero — <50 mW at 5 V output — so you meet efficiency targets without switching off the supply. That’s less than a tenth of a watt, reducing heat and energy costs in applications that are powered 24/7 but lightly loaded much of the time.
Selectable 5/9/12 V output: one part number covers three voltages
Standardise on a single supply for multiple machine variants. A physical switch lets you select 5 V (4 A), 9 V (2.22 A), or 12 V (1.67 A) — all from the same 20 W unit. Fewer SKUs, simpler procurement, and no risk of wiring the wrong fixed‑voltage supply.
Short‑circuit proof and overvoltage protection: protect your load
Safeguard downstream electronics with built‑in safety mechanisms. The output withstands an indefinite short circuit without damage — an overtemperature shutdown activates, then automatically recovers when the fault clears. Active overvoltage protection dissipates transients through a 10 Ω resistor, clamping the output before excess energy reaches your circuit.
207–253 V AC input: works across European grids
Install with confidence in any 230 V cabinet. The HDR20‑5‑12 accepts the full EN 50160 tolerance band (207–253 V AC, 49–61 Hz), so it tolerates grid swings without tripping. Just clip it onto a 35 mm DIN rail — no tools, no derating within the spec.
How the NoElko design eliminates the #1 reliability risk in DIN rail supplies
| What matters | Conventional supply (with electrolytics) | HDR20‑5‑12 |
|---|---|---|
| Life‑limiting factor | Electrolytic capacitor dry‑out (2 000–10 000 h) | No electrolytic capacitors — no wear‑out mechanism |
| Standby power (5 V) | Typically >0.5 W | <50 mW |
| Width per watt | Many 20 W supplies need 36 mm or more | 18 mm (one modular slot) for 20 W |
| Short‑circuit recovery | May require manual restart or fuse replacement | Automatic recovery after fault removal |
| Maintenance over 10 years | Capacitor replacement likely | No scheduled maintenance |
| Voltage flexibility | Fixed output per model | Switch‑selectable 5/9/12 V |
FAQ
Which output voltages are available, and how is the selection made?
Three voltages — 5 V, 9 V, and 12 V — selected via a physical switch on the unit. The corresponding maximum currents are 4 A, 2.22 A, and 1.67 A respectively, all within the 20 W power envelope.
Why does the datasheet call this a “NoElko” design, and what does that mean for service life?
NoElko means the converter contains no electrolytic capacitors. Electrolytic capacitors are the primary wear component in most switching supplies; removing them eliminates the main ageing mechanism and allows the HDR20-5-12 to operate reliably over a much longer service life than conventional designs.
What happens if the output is short‑circuited, and can the unit recover automatically?
Yes — the output survives an indefinite short circuit without damage. An overtemperature shutdown mechanism activates during short‑circuit conditions; once the fault is cleared and the device cools, it resumes normal operation without manual intervention.
What input voltage range is supported, and is the supply suitable for use outside the 230 V European grid?
The operating input range is 207 V to 253 V AC at 49–61 Hz. This covers the full tolerance band of 230 V European mains (EN 50160) but does not extend to 110 V grids; the HDR20-5-12 is not suitable for North American voltage systems without a step‑up transformer.
What is the mechanical footprint, and how many DIN rail slots does it occupy?
17.6 mm wide × 106 mm long × 60 mm high — one modular DIN‑rail unit. The product subtitle calls this an 18 mm DIN‑rail width; the mechanical specification is 17.6 mm. Household‑installation‑box style clip, no tools needed.
Can the HDR20‑5‑12 be customised for a specific output voltage or current limit?
Yes — DPS customises output voltage, current limits, protection thresholds, and connectors for production volumes. An engineering fee applies; contact us to scope your variant.
Download the datasheet (PDF) and the 3D model (STL) for detailed electrical and mechanical data.
Pricing & shipping
| Quantity | Price / unit |
|---|---|
| 1+ pcs | EUR 32.00 |
| from 25 pcs | EUR 26.99 |
| from 100 pcs | EUR 22.71 |
✓ Free shipping on orders from EUR 199
Live pricing, updated automatically. Net prices, VAT excluded.
Related products
- HDR20‑24 — 230 Vac, 20 W, fixed 24 V output, same NoElko architecture
- HDR40‑5‑12 — 230 Vac, 40 W, selectable 5/9/12 V, NoElko design for higher power needs
- HDR20‑12 — 230 Vac, 20 W, fixed 12 V output, electrolytic‑capacitor‑free
- Engineered in Germany
- CE / EMC compliant
- Manufacturer warranty
- B2B terms & volume pricing