6.3x32mm (3AB/3AG) Fuse Holders & Fuse Accessories Littelfuse 6.3mm x 32mm (3AB/3AG) Fuse Holders & Fuse Accessories are ideal for Slo-Blo® (Time-Lag), fast-acting, and very fast-acting fuses designed to IEC specifications. The 3AB Slo-Blo fuses feature ceramic body construction that permits higher interrupting ratings and voltage ratings. 3AB very fast-acting fuses protect Silicon Controlled Rectifiers and similar solid-state devices. 3AG fuses solve a broad range of application requirements.