15V/24V/30V Electrolytic Capacitor-Free Power Supply

One supply, three voltages, zero electrolytic capacitors — the HDR20-15-30 delivers fail-safe 20 W DC power for control cabinets.

• 18 mm wide
• 0 electrolytic capacitors
• <100 mW standby

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Download datasheet (PDF)

No Electrolytic Capacitors — No Wear-Out

Electrolytic capacitors dry out, causing ripple and failure. The HDR20-15-30 eliminates them completely. Conventional DIN rail supplies rely on electrolytics for filtering. Over time, heat and voltage stress degrade them, leading to erratic output or total shutdown. With NoElko technology, the HDR20-15-30 replaces electrolytics with long-life ceramic and film capacitors, engineered for decades of continuous operation. No scheduled replacements. No unplanned downtime.

Electrolytic capacitors account for the majority of field returns in power supplies. NoElko removes that failure mode at the root.

Three Voltages, One Part Number

Select 15 V, 24 V, or 30 V output via a front-panel switch. Reduce inventory complexity: a single HDR20-15-30 covers the three most common control voltages. Each setting delivers the full 20 W budget — 1.34 A at 15 V, 0.84 A at 24 V, and 0.67 A at 30 V. No need to stock separate fixed-voltage supplies for different applications. Simplifies engineering and procurement.

Compact, Cool, and Energy-Efficient

18 mm width, <100 mW standby, -40 to +50 °C operation.

• 18 mm wide — mounts on a standard 35 mm DIN rail, leaving room for more I/O, relays, and controllers.
• <100 mW no-load consumption at 24 V (typically 50 mW) — minimal self-heating and lower total energy cost across the fleet.
• -40 °C to +50 °C ambient range — works in outdoor enclosures and unheated panels without additional heating.

This supply is designed for high-density control cabinets where every millimetre and milliwatt counts.

Self-Protecting Output — No Manual Resets

Active overvoltage protection rapidly discharges the output, then self-recovers. If a transient or fault pushes the output voltage too high, the HDR20-15-30 activates a 66 Ω discharge path to pull the rail down immediately. The discharge resistor is thermally monitored, so it can handle repeated events without damage. Once the condition clears, normal operation resumes — no latching, no field intervention.

How NoElko Compares to Conventional Electrolytic-Capacitor Supplies

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Industrial-Grade Input and EMC Compliance

• Accepts 207–253 V AC, 49–61 Hz — covers all European mains grids
• N and L polarity is interchangeable — speeds up retrofit wiring
• Input transient protection and output short-circuit proof
• Meets IEC 55032 and full EMC immunity suite (IEC 61000-4-2 through -4-8)
• Manufactured in Germany — backed by a manufacturer warranty and CE/EMC certification

FAQ

Which output voltages are available and what current can each deliver?

Three voltages selectable by switch: 15 V at up to 1.34 A, 24 V at up to 0.84 A, and 30 V at up to 0.67 A. All three settings share the same 20 W power budget, so current limits scale inversely with voltage.

Does the NoElko design affect reliability compared to a conventional DIN rail supply?

Yes — the datasheet calls out "exceptional reliability" thanks to the NoElko (no-electrolytic-capacitor) construction. Electrolytic capacitors are the primary ageing component in conventional switching supplies; removing them eliminates that wear-out mode.

What is the standby power consumption when the output carries no load?

Typically 50 mW (max 60 mW) at the 24 V setting with 230 V input. The <100 mW headline applies to the 24 V setting; Figure 5 shows standby rising from ~55 mW at 15 V to ~110 mW at 30 V — so the 30 V setting actually crosses the 100 mW headline at full no-load condition.

How does the output overvoltage protection respond, and does it latch off or self-recover?

Self-recovering, not latching. Overvoltage triggers active discharge through a 66 Ω resistor, rapidly pulling down the output rail. The discharge resistor is monitored by an NTC to prevent thermal overload. The supply returns to normal operation automatically once the overvoltage condition clears.

What is the input voltage tolerance, and is the N/L polarity on the AC input critical?

The input accepts 207 V to 253 V AC at 49–61 Hz; N and L pins are interchangeable. The datasheet explicitly notes that polarity can be swapped without affecting operation, which simplifies wiring in retrofit installations.

Can the HDR20-15-30 be customised for a different output voltage or connector configuration?

Yes — DPS customises output voltage, current limits, protection thresholds, and connectors for production volumes. An engineering fee applies; contact DPS to scope your variant.