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Typical commercial power supplies are specified to support their full rated load over an ambient temperature range from zero or minus 25 degrees Celsius to around 50 degrees Celsius, and they may derate to 50% load at 70 degrees Celsius.

Some applications may require ambient operating temperatures as low as -40 degrees Celsius and as high as +85 degrees Celsius, or an even wider range. A number of factors can influence the ambient temperature that a power supply is subjected to in a given application, including the following:

Depending on the application, a power supply with a wide operating temperature range may provide better reliability and a longer operating lifetime, prevent the need for a cooling fan or other special design consideration for thermal management, and reduce the overall cost of your system.

Exceeding standard operating temperatures means running your power supply when the ambient temperature falls outside the operating temperatures for which it is rated. Sometimes this happens — you can't predict every possible usage scenario, and you can't always guarantee a stable environment.

Running your power supply within its specified operating temperatures is essential for optimizing its performance, preventing overheating and breakdowns, and extending its lifespan.

To maintain optimal performance and allow people to recharge their cars without worrying they'll become stranded in very hot or cold weather, electric charging stations should have a wide operating temperature power supply. Communications equipment often requires a ruggedized enclosure that does not always allow for adequate ventilation.