Fuse coordination is a critical step in properly sizing and selecting protective devices for your transformer designs. H-J has long provided this service for our customers via an offline service, and the algorithms have been refined over the past decades. We are proud to deliver this service to customers with an online tool which allows users real-time feedback and information which you need in this fast-paced environment! H-J has developed one of the most extensive lines of fuses and product offerings in the industry with Mersen, ERMCO Components and other fuse manufacturers in order to meet your needs.