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Discuss Power Supply Fuse Help ? in the UK Electrical Forum area at ElectriciansForums.net

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Hello everyone, I want to ask a question that I am sure will be easy for you, because I am not sure of the answer, but I am sure it is very easy for someone who is knowledgeable enough. Input 100-240V. 2.5 A - Output 24V. I have a 5A power supply, Should the fuse I need to connect before the power supply be 2.5A or 5A?
 

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The maximum input current is 2.5A so in one sense a 2.5A fuse is sufficient. But the power supply almost certainly has internal overload protection, so the question is, what does your extra fuse protect? If it is just protecting the flex against short-circuit, 5A, or even 16A, might be ideal, as it is less likely to become fatigued and eventually fail due to inrush.

Note that the highest input current (2.5A) will be at the lowest input voltage (100V) and at higher voltages it will be proportionately lower, more like 1.1A at 230V, possibly less.
 

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