From What I know, the fuse is only a real neccessity if you are running more than one device off a single battery. And mailnly on a boat. for instance, if you turn on your boat and your fish finder and bilge pump turn on simultaniously, all the power drawn can be sent to one unit blowing it. As far as the timer switches catching fire, I have had 1 in my year of working for AYS smoke, and that was it. The circuit boards are very sensitive and the pathway burns very easy. Meaning that if something shorts, the pathway for the electrical current will blow almost immediately losing its ability to conduct the electricity, so no fires can generate.
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