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How to install and operate a DIN rail power supply for reliable operation

30Mar

This article explains how the heat generated by DIN rail power supplies is dissipated, and if not managed correctly, the effect it can have on product field life and reliability.

DIN rail mount power supplies are widely used in industrial applications because of their availability, ease of use and reliability. Many manufacturers and distributors offer such products from stock. The power supplies clip firmly onto the standard 35mm DIN rail bracket and require no mounting hardware that can be mislaid. No special tools or crimp terminals are needed to connect the input and output wiring – just a simple screwdriver and a pair of wire strippers. DIN rail power supplies rely on convection cooling, having no internal fans or forced air that has to be directed through the product.

At first glance it seems idyllic, but for years of reliable, trouble free operation there are some considerations that the user should be aware of.

Power supplies are not 100% efficient, though in recent years great strides have been made where efficiencies are now routinely 90 to 95%. Even for a 95% efficient 480W power supply operating at full load, 25W will need to be dissipated internally. This will occur through convection or radiated cooling.

Read the full article in the April issue of PBSI