4A F1 British Standard Fuse – HRC, gG, 550V ac. Bussmann Series bolted tag fuse is essentially a fuse that is fitted with brackets, these brackets allow the fuse to be bolted onto a fuse holder. Predominantly, this type of fuse is used within installations as a “weak link”. They are designed to break when a fault occurs, such as an overcurrent or short circuit – they are a safety and damage measure. Cooper Bussman’s fuses are commonly found within a multitude of industrial applications, electrical equipment and wiring systems