Amp-TrapĀ® 9F60 series are current-limiting fuses with high interrupting rating, used for the primary winding protection of potential transformer. Ferrule mounting for standard clips and interchangeability with other brands of fuses. Current-limiting for superior equipment protection. Non-venting for silent operation. Metal embossed catalogue number and manufacturing date for lasting identification. Blown-fuse indicator to give positive identification of open fuse is available on the 9F60 series. clip mounting. GMG, epoxy body material and copper, tin-plated copper and brass material contact. Applications: Primary protection for potential transformers (PT) or control power transformers (CPT).