Blue Sea Systems High Performance Battery Switch - Offering reliability and an outstanding value, this battery switch is designed with a luminous face plate and pointer with tactile indicators for easy operation in low light. 3/8" tin-plated copper terminals for maximum conductivity and corrosion resistance. Vapor-proof and ignition protected in a tough Lexan case. Ratings meet new engine starting standards, 350 amps continuos; 600 amps intermittent; 700 amps cranking; 1600 amps in-rush. 4" x 4" x 2 3/4".