Ferraz Shawmut Mersen A4BY800 time-delay current-limiting fuse is an ideal choice for protecting your electrical equipment and supplies. With a rating of 600-volt and 800-amp, this fuse is perfect for use in a variety of applications, including business and industrial settings. Designed with quality and reliability in mind, this fuse features a current-limiting design that helps prevent damage to your equipment and supplies. The brand Mersen is known for producing high-quality fuses and links, and this particular fuse is no exception. If you're looking for a reliable and effective way to protect your electrical equipment and supplies, the Mersen A4BY800 time-delay current-limiting fuse is an excellent choice.