This is an example of the safety fuse simulation, performed with QuickField software.
Conductor diameter: 0.2 mm;
Rated current I0 = 5 A.
Fault current I = 20 A.
Ambient air temperature T0 = 20 °C;
Conductor melting point T = 240 °C;
Quartz sand thermal conductivity λ = 0.3 W/m-K.
Determine the cylindrical fuse operating time.
Fuse resistance 0.041 Ohm. The temperature will reach conductor melting point 0.5 seconds after the fault.