900A High Speed thyristor protection AC Fuse.
End contact mounting in ventilated space.
Use with 725A 590P and 591P DC Thyristor Drives.
Ixt is 700k A2S @ 660Vac, prearc 135k A2S.
Voltage rating is 690V AC maximum.
Manufacturer is Mersen, previously sold under the Ferraz Shawmut brand.
Part number 6,6 URD 33 TTF 0900 (A3000081)