Thread: Big fuses
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Old 10-13-2017, 08:41 PM   #18
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Originally Posted by djmarchand View Post

Your reference does not include a short circuit current interrupt spec, but I will bet it isn't high enough. If you take a big battery bank, say two GC batteries, and a big conductor, say 2/0, and if it shorts to a serious ground, say the engine block, a whole lot of current will flow.

A Class T fuse has an interrupt rating of at least 10,000 amps which is what it takes to safely interrupt the situation described above. If the fuse isn't rated high enough the arc can continue until it melts the fuse block and could possible start a fire.

That is why you always want to use Class T fuses with big batteries and cables.

Yup. The terminal fuses do have the specs but it's buried. 10000 amps at 14v.

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