The right power supply depends on efficiency, noise, thermal budget, hold-up, isolation and installation constraints. Each option changes the enclosure and compliance work around it.
Where switching supplies fit
Switch-mode supplies offer high efficiency, wide input ranges and compact power density. They suit control panels, automation equipment, lighting systems and many regulated DC loads.
Their switching behavior can require attention to EMI, ripple, minimum load, inrush, grounding and protection coordination.
Where transformer architectures remain useful
Transformer-based and linear architectures can be preferred for low noise, robust transient behavior or simple serviceability. They are usually larger and less efficient at the same output.
Some systems use both: a transformer for isolation or voltage adaptation and a regulated supply for the final DC rail.
Select against the real load
Include peak demand, start-up current, duty cycle, ambient temperature and enclosure. Check whether the stated output current is available across the entire operating temperature range.
Agree the approvals, declarations, connector and mounting details before comparing price.