Hero999 Posted December 10, 2009 Report Share Posted December 10, 2009 If a project is low powered <1.5A then it's a good idea to add a fuse because the lowest rating plug fuse you can normally buy is 3A and won't be enough to protect the circuit.Unfortunately most cheap transformers have one shot thermal a one shot, non-replaceable thermal fuse which is why it's important to add an external fuse.Another thing is that lots of projects use regulators such as the LM317 or LM78xx which have built-in thermal protection so there's a very small risk of them going wrong. Quote Link to comment Share on other sites More sharing options...
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