The rated voltage UN of the fast fuse should be slightly larger than the external AC voltage of the fault circuit that appears at both ends of the fast fuse blown. When the load of the semiconductor device is an active inverter, inverting brake motor, inverter load, it should be considered that the semiconductor device out of control causes the possibility of short-circuiting of the device, at which time the fast fuse blows, melting The AC voltage and DC voltage overcapacity, the rated voltage of the fast fuse should be calculated in the formula: UN ≥ uac + udo × 1 / √2: UAC: Fast fuses fuse after plus AC voltage; UDO: Semiconductor Device load end inverting DC voltage.
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