[Elecraft] K2 circuit breaker

[David Cutter]

Normal fuses are rated such that when 2.1 times their nominal current rating 
is passed they will break within 30s.  So, a normal 20A fuse will not break 
until it is passing >40A and even then it will take a long time to go, 
enough to fry the rig.  The fuse is there to protect the cable when a gross 
overload occurs, eg a dead short across the power cable entry; perhaps when 
you drop a spanner in the works  : o (

David
G3UNA