Blue Sea Systems ST Glass Fuse Block with Negative Bus Features: Clear insulating cover with label recesses for accept Large Format Labels; Cover insulates all conductive parts, satisfying ABYC/USCG requirements and storing spare fuses; Tin-plated copper buses and Phosphor Bronze fuse clips give 30 Ampere rating per circuit; Accepts AGC (Fast Acting), MDL (Time-Delay) and all other 3AG Glass Fuses; Weight 0.55 (0.25); 6 circuit with negative bus;