They are extremely high interrupting rating fuses: 440 VDC, with a large band of ratings (from 50 A to 100 A).
High-Speed Cylindrical Fuse Protistor® Size 22x58 gLB 440VDC IEC 50A With Striker
High-Speed Cylindrical Fuse Protistor® Size 22x58 gLB 440VDC IEC 63A With Striker
High-Speed Cylindrical Fuse Protistor® Size 22x58 gLB 440VDC IEC 80A With Striker
High-Speed Cylindrical Fuse Protistor® Size 22x58 gLB 440VDC IEC 100A With Striker
Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 760VAC UL 600VDC UL 500A Flush ends metric threads
Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 760VAC UL 600VDC UL 500A Visual Indicator Flush ends UNC threads
Square Body High-Speed Fuse Protistor® Size 31 aR 690VAC IEC 760VAC UL 600VDC UL 500A With Striker Microswitch Flush ends UNC threads