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petermcgowan avatar image
petermcgowan asked

External Fuse Size for Orion-Tr DC-DC Converter 48/12-30

Hello All, Wondering what size I should use for external fuse, I can't find it in the Datasheet or User Manual. Thanks! Peter

Orion DC-DC Converters not smart
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2 Answers
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wkirby answered ·

A fuse is used to protect the wiring. Select a fuse appropriate for the wiring that you are using in you installation.

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Thanks WKirby. A 70amp fuse will protect the wire (AWG6, 48V, 2m). I was not sure whether the Orion would handle that current or I should protect it with a smaller fuse.

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kai answered ·
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Thanks Kai, I had been puzzled by that point, or more specifically that even though it's overload and short circuit proof it still notes that all models require an input fuse (the 12/24v have an internal input fuse and the 48v requires one but with no suggested rating). I may be missing something, but I concluded the internal input fuse on the 12/24v protects the device (if it was protecting the input wire wouldn't it be at the supply end of the wire?) , so I assumed the same was the case with the 48v model, i.e. it's protecting for catastrophic failure where the short circuit and overload protection don't actually work. So I went ahead and found the smallest rated 48v fuse I could find from Blue Seas which was a MRBF 30amp. It'll certainly protect the wire, and it shouldn't blow in regular use as it's about double the watts the Orion should be pulling (allowing for colder temperatures and/or lower than 89% efficiency).

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