Ferraz Shawmut) Protistor fuse. It is identified by the part number N330039.
This is an ultra-fast acting (aR class) square-body fuse designed to protect power semiconductors such as diodes, thyristors, and IGBTs.
It is rated for 160 Amps (A) and a voltage range of 660-690 Volts (V) AC.
The fuse conforms to the EN 60 269 standard.
It is a size 000 fuse with a DIN80 vertical style.