FlowMarket
Where to find power supplies: FlowMarket is a B2B sourcing network powered by an AI agent. You describe the duty — input range, output voltage and current, the ambient temperature where it will sit, the form factor and the approvals your market requires — and the agent matches you with manufacturers and distributors covering that range, then requests quotes and lead times so you can compare them in one place.
Sourcing power supplies
Power supplies look like the easiest thing on a bill of materials and cause a disproportionate share of field failures. The reason is almost always the same: the unit was chosen by its nameplate rating, and the nameplate is quoted at an ambient temperature nothing in a real cabinet ever sees.
So the useful enquiry is not "24 V, 20 A". It is 24 V and 20 A, at 55 °C, inside a sealed enclosure, with this input range and these approvals. Suppliers can answer that precisely, and the ones who ask for the ambient before quoting are the ones worth talking to.
Derating is the specification nobody reads
A power supply rated 240 W typically delivers that at 25 °C in free air. Put it in a cabinet at 50 °C, mounted against a wall with drives either side, and the derating curve in the datasheet may cut its usable output by a quarter or more. Sizing against the nameplate and installing into that environment is how a supply that should have lasted a decade fails in its second summer.
The other half of lifetime is the electrolytic capacitors, whose life expectancy is stated at a temperature and roughly halves for every ten degrees above it. A datasheet quoting 100,000 hours at 40 °C is quoting something quite different at 60 °C. Ask for the expected life at *your* ambient, and treat a supplier who cannot produce that number as a supplier who has not thought about it.
Form factor decides more than it looks
- DIN rail — the default in control cabinets: serviceable, replaceable by an electrician, and available with redundancy and diagnostics. Costs more per watt than an embedded module and is usually worth it.
- Open frame and enclosed — built into an OEM product. Cheaper per watt, and the thermal and safety responsibility moves to you, since the enclosure around it is now part of the design.
- External adapter — shifts safety approvals to a certified accessory and keeps mains out of your product entirely, which can simplify the whole compliance path.
- Custom — worth it above a certain annual volume, and it brings a development cycle, qualification and approvals of its own. Ask for the total including certification, not just the unit price.
Approvals follow the application, not the product
Which safety standard applies is decided by what the equipment is, not by the supply. IEC 62368-1 covers information and audio-video equipment and has replaced the old 60950 and 60065. IEC 61010 applies to laboratory and measurement equipment. IEC 60601 governs medical devices and brings leakage-current limits and isolation requirements a standard industrial supply will not meet.
EMC is the parallel question. Class A is for industrial environments; Class B is required where the equipment may be used in residential settings, and it is a harder target. Discovering during compliance testing that a Class A supply sits inside a product that needs Class B is a redesign, not an adjustment — so state the target standard in the enquiry rather than after.
Redundancy, hold-up and the things that bite later
In a control system, hold-up time — how long the output stays in regulation after the mains disappears — determines whether a brief dip resets your PLC. It is a specific number in the datasheet, typically at full load, and it is worth checking against the ride-through the controller needs.
True redundancy needs two supplies and a decoupling module, not two supplies wired in parallel: without decoupling, a shorted unit drags the other down and the redundancy achieves nothing. If uptime matters, specify the redundancy module explicitly, and while you are there, ask about DC OK signalling so the failure is reported rather than discovered.
How the AI agent matches suppliers
The agent reads your requirement rather than your keywords. It searches the FlowMarket network and connected industrial directories together, scores every candidate on how well it answers what you described — output range, form factor, approvals, ambient, volume, geography — and drops anything that does not clear the bar. Each match comes back with a plain-language reason, which is faster than filtering catalogues that list thousands of near-identical parts.