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#43 in Industrial Control (B2B)
MEAN WELL EDR-120-24 — DIN Rail Power Supply 24V DC 5A 120W
Industrial Control (B2B)

MEAN WELL EDR-120-24 — DIN Rail Power Supply 24V DC 5A 120W

4.8(471 reviews)

$30.99reference price

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Best for

Powering a panel's electronics with a stable 24V DC supply — PLCs, sensors, Modbus RTU relay modules and 24VDC contactor coils — something this catalog didn't have covered yet: it only had a 5V DC supply (for low-power electronics) and a 24V AC transformer (for HVAC), but no 24V DC supply, the most common control voltage in industrial automation.

  • 24V DC Power Supply
  • DIN Rail
  • 120W / 5A
  • Active PFC

What is it and what's it for?

Think of it as an industrial charger permanently screwed into the panel instead of a wall-plugged transformer: AC power from the grid goes in (120V or 220V, either works, no selector needed) and stable 24V DC comes out — the voltage most PLCs, sensors and industrial control relays 'speak'. The same way a phone needs a charger to step wall voltage down to something the battery can use, this equipment needs this supply to step grid power down to the 24V DC its electronics expect.

Real-world use cases

At home

In a home workshop or garage with a small PLC or an industrial Arduino/ESP32-based controller built into its own panel (the same kind of project as this site's Node-RED with Modbus guide), this supply centrally powers the controller, its sensors, and any connected Modbus RTU relay module, instead of relying on loose USB chargers or wall adapters that don't mount anywhere.

In a business or workshop

In a busier industrial panel — like the one in this catalog's electrical panel build guide — this supply is enough to power several Modbus RTU relay modules (the 8-, 16- and 32-channel ones in this same ranking) plus a PLC and its field sensors from a single centralized point, instead of a separate supply per device. The 5A of headroom matters here: add up the real draw of each device before assuming 120W covers it comfortably.

How to avoid buying the wrong one

  • Confirm you need 24V DC, not 24V AC, before buying: this catalog's WUYELIN transformer is also labeled '24V', but it's alternating current for HVAC circuits (thermostats, gas valves) — it won't power DC electronics, and this supply won't run AC control circuits either.
  • Add up the real draw of everything you plan to connect (PLC, sensors, relay coils) before assuming 120W/5A covers it with margin — several Modbus RTU modules plus a PLC can get closer to that limit than it looks at first glance.
  • It cools by free air convection, no fan: if you're mounting it in a tightly packed, poorly ventilated enclosure in a hot environment, leave clearance around it or derate it (don't run it at 100% of rated output) per the manufacturer's datasheet.

The investment takeaway

Against a generic unbranded 24V DC supply (noticeably cheaper on Amazon), Mean Well is one of the most established names in the field: every unit goes through a 100%-load burn-in test before leaving the factory, it carries a 2-year manufacturer warranty, and its short-circuit, over-voltage and overload protections are real, not just spec-sheet claims. If this supply fails on a live panel, everything it feeds (PLC, sensors, relays) goes down with it, so the premium over a generic option is cheap compared to the downtime it prevents. With 471 reviews and 4.8 stars, it has a stronger track record than most of the protection and control parts already in this catalog.

MEAN WELL EDR-120-24 — DIN Rail Power Supply 24V DC 5A 120W

$30.99reference price

See current price on Amazon

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