The Bussmann series HEB- AA fuse holder is a non-breakaway, submersible (optional), single-pole, in-line fuse holder for 13/32" x 1-1/2" supplemental fuses. It is available with many terminal options to meet application needs. To be submersible, an insulating boot may be purchased separately. Supplemental fuses provide additional protection for electrical circuits beyond what is offered by branch rated devices. They are not intended for branch circuit protection but are designed to protect specific components or equipment within an electrical system. This is particularly important when protecting sensitive equipment from overcurrent or where precise overcurrent protection is necessary.