What the Description Means
The A4BY1000BG: The description 'Switchgear Fuse/USE 192A9805P2' identifies this as a fuse intended for switchgear applications. The 'USE' prefix and '192A9805P2' suffix are legacy cross-reference identifiers from the original equipment manufacturer's cataloging system. For a replacement, you would need to match the physical dimensions, voltage rating, and interrupting capacity to the switchgear cubicle's requirements — the fuse itself carries no further functional ratings in the available record.