LED ATO Fuse-It's Brilliant. Lights up if your fuse blows. Eliminates guesswork. Designed to meet OEM specifications. Multi-pack: 10-15-20-25-30 Amp ATO fuses. ATO LED Smart Fuse, 5 Pack. California Prop 65 - Warning, This product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.