Power Supplies

Choosing Power Supplies components

Power supply selection is one of those decisions that looks simple — match voltage, match current — but where margin and feature choices determine whether the supply lasts five years or fails under load. Industrial supplies are not interchangeable with commercial-grade desktop PSUs, especially in cabinets without active cooling.

Specs to confirm before ordering:

Output voltage: 24 VDC (most common), 12 VDC, 48 VDC, ±15 VDC, 5 VDC
Output current — size to total connected load with 30–50% headroom for inrush and future growth
Input range: 90–264 VAC universal (most common), 24 VDC, or 3-phase 380–480 VAC for high-power supplies
Mounting: DIN-rail (most industrial), panel/chassis, open-frame, enclosed brick
Form factor width on the DIN rail (matters in dense cabinets)
Efficiency rating — 90%+ for current-generation supplies, lower for older or budget units
Operating temperature with derating curves — full-rated output to 50–60 °C, then linear derating
Hold-up time on input dropout (typically 20–30 ms; longer with buffer module)
Diagnostic outputs: DC OK relay, signal for low voltage, communication to PLC
Parallel and redundancy capability — paralleling for higher current, redundancy diode module for 1+1 hot-standby

Common gotchas: a 10 A supply running at 10 A all day has no margin for inrush or for ambient temperature derating — most installations size to 60–70% of the rated current for continuous loads. Cheap commercial 24 V "wall warts" should not be used to power industrial PLCs and sensors; they lack the input filtering, hold-up, and over-current protection that real industrial supplies provide. Redundancy requires paired supplies AND a redundancy diode module — paralleling two PSUs without the diode allows one to back-feed the other and creates a single point of failure on the input side.

Typical applications: 24 VDC supply for sensors, valves, and PLC inputs across the cabinet; isolated 24 V for safety circuits separate from machine I/O; ±15 V for analog circuits; and redundant supply for critical machine controls and safety PLCs.

For obsolete power supplies, send the OEM part number for a sourcing quote.

Do you stock obsolete power supplies?

Yes. Discontinued Phoenix Contact QUINT first generations, retired Siemens SITOP smart, end-of-life Puls Dimension early codes, and earlier Mean Well DR-series are sourced through our supplier network.

How much current headroom should I size for?

30–50% above the calculated steady-state load. Sensors and valves draw inrush on startup that exceeds steady-state, and cabinet temperatures rise over the day. Tightly-sized supplies fail prematurely.

Can I parallel two supplies for more current?

Only if the supply explicitly supports parallel operation. Two standard supplies wired in parallel will not share load — one carries most of the current and overheats. Parallel-capable supplies have current-sharing logic and a parallel-enable input.

What is a buffer module?

A buffer module stores energy in capacitors and extends the supply's hold-up time during AC dropouts — useful for keeping PLCs and HMIs running through brief power interruptions. Typical extension is from 20 ms baseline to 1–10 seconds.

Do I need an industrial UPS?

For long-duration ride-through (minutes) or for graceful shutdown of PCs and HMIs, yes. For short interruptions (under a few seconds), a buffer module is cheaper and simpler. Match to the actual outage characteristic on your supply.

What is the warranty?

12-month functional warranty. Damage from over-voltage on input, short circuit on output beyond the supply's protection, or operating outside rated temperature is not covered.

Autonics SPB-A015-12 DIN Rail Switching Mode Power Supplies

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Autonics SPB-A240-12 DIN Rail Switching Mode Power Supplies

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