Power supplies used in industrial control panels and building automation equipment are becoming more compact, and that shift puts pressure on engineers to find AC/DC units that can deliver reliable power without eating up rail space. When systems include relay banks, motors, contactors or other loads that pull short bursts of current, the challenge grows. RECOM’s latest DIN rail supply aims directly at this problem by combining a slim mechanical footprint with enough headroom to ride out transient demands.
Why This Matters for Engineers
DIN rail power architectures often sit at the centre of a wider system, and a supply that misbehaves during a start up surge can ripple through an entire installation. A unit that offers headroom without resorting to over specifying the power budget helps keep designs smaller and more cost effective. The new 90 W REFIN2U-S90/24/CL sits in that space. It introduces a short duration boost capability that can absorb inrush or motor engagement events without needing a larger supply. For control cabinets that run continuously in office or residential environments, low audible noise also matters more than most datasheets admit.
Key Technical Capabilities
Despite its size, the supply supports an input envelope from 85 VAC to 276 VAC and maintains operation up to 5000 m altitude. The nominal 24 V output can be trimmed to 29 V, which is useful when compensating for voltage drop on long cable runs. The overload behaviour is governed by a constant current profile, which provides predictable performance when downstream loads momentarily exceed expectations. Efficiency peaks at around 93.6 percent, which helps limit internal heating and supports wider thermal margins. The unit’s certification as NEC Class 2 under UL1310 simplifies approval paths for applications that must meet limited power requirements.
Design Considerations and Use Cases
The housing uses a step shape common in compact DIN rail products, but the width is trimmed to only 36 mm. That is valuable in multi channel systems where a few millimetres quickly add up. Push in terminals allow installers to wire the device without tools, which saves time during panel assembly. For engineers working on building automation, security panels or distributed sensor gateways, the acoustically quiet design can make integration easier in locations where audible noise can be a problem.
Implications for Future Designs
Compact supplies with short term boost margins remove some of the traditional compromises between cabinet size and load capability. As more equipment migrates into smart building and small form factor industrial nodes, the ability to mount a high efficiency supply without redesigning the enclosure will become increasingly important. A unit with the thermal and electrical headroom demonstrated here helps engineers keep that flexibility while maintaining compliance with the relevant EMC and safety standards.
Learn more and read the original at www.recom-power.com
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