Why Does a Fuse Blow?

Answer

A fuse blows because of heat from an overloaded circuit. When a circuit is overloaded, the electrical resistance in the circuit increases and this may cause damage to your equipment or cause a fire. The fuse therefore blows in order to prevent this.
Q&A Related to "Why Does a Fuse Blow?"
A fuse blows when the current draw of the circuit is greater than the capacity of the fuse.
http://wiki.answers.com/Q/When+a+fuse+blow+ups
An arc occurs in an electrical circuit when current flows through a gap of ionized gas or air. This event generates a very temperature, enough to melt most metals in less than a second
http://www.quora.com/Electricity/Why-does-arcing-b...
Circuit breakers trip and fuses blow all the time. The cause of the problem, however, can vary. One of the main issues is an overload in the wiring. Wiring in homes is set up in sections
http://www.ehow.com/how-does_5189147_fuse-blow-cir...
Since its a new unit, and you didnt have this problem before, I venture to say that the power wires feeding the unit voltage are somehow touching some metal conduit somewhere, like
http://answers.yahoo.com/question/index?qid=200911...
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