Ships from U.S. warehouse via CWR Distribution. Manufacturer warranty applies when included by the brand.
Marine-grade circuit protection from Blue Sea Systems. Built for the demands of saltwater, vibration, and continuous DC loads — not generic automotive fuses.
Key benefits
Protects expensive marine electronics from short circuits
Corrosion-resistant for saltwater environments
ABYC-compliant marine construction
What you're getting
Brand: Blue Sea Systems Part Number: 7721 Ships from: CWR Distribution (authorized dealer) Warranty: Full manufacturer warranty
Product details
MEGA or AMG Fuse Safety Block Ignition protected for installation aboard gasoline or diesel powered boats Sealed cover protects fuses from the harsh marine environment Insulating cover satisfies ABYC/USCG insulation requirements Cover breakouts allow wire access in any direction 300A maximum with 2/0 cable Accepts Blue Sea Systems Square Format standard or custom label Fuses sold separately WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov .
Shipping & returns
Free shipping on orders over $199. Standard shipping $9.95 flat. Ships within 1 business day from our supplier's warehouse. Full manufacturer warranty coverage — we handle warranty claims for you as your authorized dealer. Questions? Call or email — real human support, no chatbots.
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