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

Blue Sea Systems 3003 HD-Series Battery Switch Selector with Alternator Field Disconnect is a Blue Sea Systems battery switch built for battery isolation and onboard power control. Designed for marine environments, it supports reliable performance, clean installation, and long service life in demanding onboard electrical systems.

3003 HD-Series Battery Switch Selector with Alternator Field Disconnect Features: 500 Ampere Continuous Rating Accepts 4/0 battery cables Ignition protected – safe for installation aboard gasoline powered boats .870" (22.01mm) stud length to accept 4 or more cable terminals 1/2" (M12) Tin-plated copper studs for maximum conductivity and corrosion resistance Meets American Boat and Yacht Council (ABYC) requirements for battery switches Tactile textures indicate knob position by feel only Case des

This component is suited for boat electrical upgrades, repairs, and new installations where dependable power management and serviceability matter.

Ideal for builders, refit projects, and serious boat owners who want marine-grade electrical hardware from a trusted brand.