Are ac and DC Fuses the Same?
Direct currents are very difficult to stop or interrupt when compared to alternating currents. Alternatingcurrent sources reverse the flow of current 120 times a second (in some locations 100 times a second on 50 Hz systems). Each time the current reverses, it goes to
zero in magnitude. A zero current is very easy for a melting fuse to stop or interrupt—it is already stopped, and there is no force trying to sustain an arc across the fuse element. DC currents, as the name implies, are currents that travel in one direction only. They do not reverse. Fuses bear the entire burden (with no help from the current) of acting to stop these currents. The internal elements of a fuse must react to an overcurrent condition (usually by melting) and as they react, they must do so with enough capability to interrupt the current from flowing while extinguishing any arc that might form. DC fuses are relatively sophisticated devices that have many different internal elements that must work together. The complexity of DC fuses makes them cost more than ac fuses that may contain only a single, meltable link.
NeilP wrote:No idea..but i can show you my first blown fuse in over 2700 miles
ryan wrote:Any one have a better answer for this? I just got a comically huge Maxi 80A fuse and inline holder. I don't have enough room for this monster and am hoping someone else has figured out a smaller alternative.
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