DIN Rail Power Supply: 20 W USB-C PD, 18 mm Wide

Power USB-C devices directly from the DIN rail — no electrolytic capacitors, < 50 mW standby, and just 18 mm wide.

• 18 mm DIN rail width
• < 50 mW standby power
• 0 electrolytic capacitors

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No electrolytic capacitors — designed for decades of continuous service

Eliminate the most common cause of power-supply failure. Electrolytic capacitors dry out over time, especially in warm control cabinets. The USB-AC-PD uses ceramic and solid‑polymer capacitors exclusively, matching the service life of the cabinet itself.

Download the datasheet for the full bill of materials and derating curves. CE Declaration • 3D model (STL)

18 mm wide — build denser control cabinets

Slide more power into less rail. At one modular unit (17.6 mm actual, 18 mm nominal), the USB-AC-PD leaves room for other breakers and automation components. Snap it onto any 35 mm DIN EN 60715 rail — no tools, no screws, no wasted space.

< 50 mW standby — cut energy waste and cabinet heating

When the load is idle, the supply barely draws. With no‑load consumption under 50 milliwatts, the USB-AC-PD helps meet efficiency targets and keeps enclosures cooler. Forget about “vampire” drain adding up across dozens of panels.

USB-C PD: charge modern devices directly from the rail

Power laptops, tablets, embedded computers, or smart meter gateways without a separate adapter. The USB-AC-PD auto‑negotiates 5 V / 3 A (15 W), 9 V / 2.22 A (20 W), or 12 V / 1.67 A (20 W) via USB‑C Power Delivery. When no PD device is present, the port defaults to safe 5 V.

• 5 V – 3 A (15 W)
• 9 V – 2.22 A (20 W)
• 12 V – 1.67 A (20 W)
• Additional 5 V auxiliary output for GPIO/LED strips

Industrial protection built in — no fragile wall-wart reliability

Short‑circuit proof indefinitely, plus active overvoltage clamping. Input transient protection (MOV) and a transistor clamp on the USB‑C output protect both the supply and your load. An overtemperature shutdown engages at 70 – 80 °C to prevent thermal runaway. The green power LED lets you verify operation at a glance.

• Input protected by metal‑oxide varistor (MOV)
• Output short‑circuit proof — no time limit
• Active overvoltage clamp at 12 V on USB‑C output
• Operating range: -40 °C to +50 °C (derating may apply at extremes)

How the USB-AC-PD eliminates reliability risks in control cabinets

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FAQ

Which USB-PD voltage levels does the USB-AC-PD negotiate, and what current is available at each?

The USB-AC-PD supports three USB-PD levels: 5 V / 3 A (15 W), 9 V / 2.22 A (20 W), 12 V / 1.67 A (20 W). Total USB‑C output is capped at 20 W. PD negotiation details are available from DPS on request.

What happens when no USB-PD device is connected — does the output stay at a high voltage on the USB-C port?

No — the output defaults to 5 V whenever no device is present. The voltage only rises to 9 V or 12 V after a successful PD handshake, so non‑PD devices always see a safe 5 V.

Is there protection if the output is short-circuited?

Yes — the USB‑C output is short‑circuit proof indefinitely. During sustained shorts an overtemperature shutdown (70–80 °C) engages. Contact DPS to confirm whether a power cycle is required for recovery.

Does the design use electrolytic capacitors, and what are the implications for service life?

No electrolytic capacitors are used anywhere. Eliminating the dominant wear‑out component in switched‑mode supplies supports a long service life. Operating range is -40 °C to +50 °C; derating may be needed at temperature extremes.

What is the DIN rail footprint?

The unit fits one modular unit: 17.6 mm wide × 106 mm long × 60 mm high. It mounts on a standard 35 mm DIN EN 60715 rail. The product subtitle rounds the width to 18 mm for convenience.

Can the USB-AC-PD be customised — for example to support additional PD profiles or a different auxiliary output voltage?

Yes — DPS offers customisation of output voltage profiles, PD PDO sets, and auxiliary output parameters for production volumes. An engineering fee applies; contact DPS to scope your variant.