Blue Sea Systems 3003 HD Battery Switch Selector with Alternator Field Disconnect

The Blue Sea Systems 3003 HD-Series Battery Switch Selector with Alternator Field Disconnect is a heavy-duty marine battery management solution designed for boats requiring high-amperage switching capabilities. This professional-grade selector switch allows you to choose between two battery banks, combine them, or turn them off completely, while the integrated alternator field disconnect (AFD) protects your alternator from voltage spikes during switching.

Key Features:

• 500 ampere continuous duty rating for demanding marine applications
• Accepts up to 4/0 AWG battery cables for maximum current capacity
• Ignition protected design - safe for installation on gasoline-powered boats
• Extended 0.870" (22.01mm) stud length accommodates four or more cable terminals
• 1/2" (M12) tin-plated copper studs provide superior conductivity and corrosion resistance
• Tactile textures on control knob indicate position by feel for easy operation
• Versatile case design allows surface or rear panel mounting
• Compatible with all Perko and Guest low amperage battery switch mounting patterns

This battery selector switch meets all American Boat and Yacht Council (ABYC) requirements for marine battery switches, ensuring reliable performance and safety in marine environments. The alternator field disconnect feature is essential for protecting sensitive charging system components when switching between battery banks under load.