The PSR073FS0500Z is a specialty fuse made by Littelfuse. It has a 500A amperage rating and 1250V voltage rating, and is size 73 with flush end in thread. This fuse is used for a variety of applications, including in electrical distribution systems, motor control systems, and other industrial equipment. It is designed to provide fast and reliable circuit protection, and is UL Recognized, CSA Certified, and CE Compliant.