Cylindrical fuse operation time

QuickField simulation example

This is an example of the safety fuse simulation, performed with QuickField software.

Problem Type
Axisymmetric multiphysics problem of DC conduction coupled to transient heat transfer.

Geometry

Given
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.

Task
Determine the cylindrical fuse operating time.

Result
Fuse resistance 0.041 Ohm. The temperature will reach conductor melting point 0.5 seconds after the fault.

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