TIA20A Series 20A British Standard Fuse, A2, 660V ac, 73mm. The Red Spot range of offset slotted or bolted tag fuses are specifically designed for the protection of general industrial applications such as power distribution, cable protection and motor protection. Available in British Standard fuse sizes from A1 to A4 these offest slotted and bolted fuses are suitable for general purpose rating (gG) and dual motor rating (gM) motor protection types.