The segmentation capability of fast fuses
In addition, the dispersion of product manufacturing is also one of the factors affecting the breaking ability.
An easily overlooked issue is the power factor of the circuit in the event of a short circuit fault, as the magnitude of the arc energy generated during rapid fuse breaking is closely related to the magnitude of the circuit inductance. When the power factor cos φ<0.2, there is a particularly high requirement for the breaking capacity of the circuit.
The energy during the breaking of a fast fuse Wo=Wa+Wr+W1
In the formula: Wa – arc energy; Wr — energy consumption of resistor; W1- Energy released by line inductance.
When the breaking capacity meets the requirements of the rectifier, it is also important to note that the peak value of the arc voltage at the moment of breaking (referred to as the “transient recovery voltage” in the standard) should not be too high. It should be limited during the manufacturing of the fast fuse to be lower than the maximum value that the semiconductor device can withstand, otherwise the semiconductor device will be damaged. Therefore, the fuse with the shortest breaking time may not be the most suitable.
When a fast fuse is used in a DC circuit, there is no zero crossing point of voltage during the DC breaking process, which is a strict condition for the reliable breaking of the fast fuse. Therefore, in general, if a fast fuse is used in a DC circuit, only 60% of the rated voltage of the fast fuse can be used, and it is best to choose a DC fast fuse.
GFEFUSEs: Manufacturer of fuses, DC fuses, fuse holders, high-speed fuses, semiconductor fuses, automotive fuses, automotive fuse holders, photovoltaic fuses, and solar fuses
