Fuse holders are made of high grade flame-retardant, non-hydroscopic, phenolic moulding to IS 1300, BS 771 with a hard gloss surface, black finish.
They are simple in construction with minimum number of components. Carrier contact and base contact are mounted using locating ridges formed on the moulding, assuring perfect alignment. Type NS fuse-carriers have a single piece phosphor bronze clip, while type SM fuse-carriers have a single piece pressed brass spin riveted contact. The base is also made of a single piece extruded brass tinned contact having adequate size of cable hole to accommodate aluminum cable.