TDK-Lambda UK
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Can I Operate my AC-DC Power Supply with a DC Input?
...The answer is yes, sometimes. But the unit's safety certification may only apply to AC input.
Many standard AC-DC switched mode power supplies (most of TDK-Lambda’s products) will operate from voltage DC input range in addition to the more common AC input range of 90-264VAC.
However we strongly recommend users to contact their supplier for guidance on safe installation.