You can wish for a reliable power supply.
Or you can order one from stock.
You should think about a good power supply when you are buying one - and then never again. Thanks to wide-range input, outstanding load behavior and all relevant certifications, SITOP guarantees a constant power supply. In addition, the unique range of add-on modules protects against major faults such as power failure and overload.
Top reliability. Top efficiency. Top Integration. SITOP
http://www.automation.siemens.com/mcms/power-supply-sitop/en/sitop_compact/Pages/Default.aspx?stc=wwiia200372

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