Blue Sea Systems E-Series Battery Switch On-Off Model 9003E-BSS for Marine and RV Applications

The Blue Sea Systems E-Series Battery Switch Model 9003E-BSS is a reliable, high-capacity switch designed for demanding marine and RV power systems. With a continuous rating of 350 amps, it handles inboard gasoline or diesel engine applications with ease, ensuring you can switch your battery power safely and efficiently. This switch features tin-plated copper studs for maximum conductivity and corrosion resistance, making it an ideal choice for harsh marine environments. It accepts up to 4/0 AWG battery cables and is compatible with 3/8 inch (M10) ring terminals, providing versatile installation options.

The switch's 7/8 inch (22mm) stud length allows for multiple cable terminations, and the one-piece terminal stud design guarantees that the connection never loosens over time. Its universal fit accommodates most Perko and Guest low amperage battery switch hole patterns, simplifying installation. The case design supports both surface and rear panel mounting, offering flexibility based on your space constraints. A tactile indicator on the knob provides easy, visual confirmation of the switch position by feel, enhancing safety during operation.

Built to withstand demanding conditions, the Blue Sea Systems E-Series Battery Switch is rated waterproof at IP66, protecting it from powerful jets of water, and is ignition protected, making it safe for installation aboard gasoline-powered boats. The make-before-break contact design allows for switching between battery sources without interrupting power, which is critical during engine start or system maintenance. This switch manages a single battery to single load group configuration, making it suitable for various marine and RV power management setups.

Designed for durability and performance, the switch features a maximum voltage of 48V DC and a torque specification of 140 in-lb (15.82 Nm) on the terminal studs to ensure secure connections. Its robust construction, combined with corrosion-resistant tinned copper studs and compatibility with large gauge cables, supports reliable operation over time. Whether you're upgrading your boat's electrical system or installing a new RV power setup, the Blue Sea Systems 9003E-BSS offers a dependable solution that meets rigorous safety and performance standards.

Features:

• 350 Amps continuous rating for inboard gasoline or diesel engines

• Tin-plated copper studs for maximum conductivity and corrosion resistance

• Accepts up to 4/0 AWG battery cables

• Studs accept 3/8 inch (M10) ring terminals

• 7/8 inch (22mm) stud length for multiple cable terminations

• One-piece terminal stud design prevents loosening over time

• Compatible with most Perko and Guest low amperage battery switch hole patterns

• Supports surface or rear panel mounting

• Tactile indicator provides knob position feedback by feel

• Waterproof IP66 rated for protection against powerful water jets

• Ignition protected for safe installation aboard gasoline-powered boats

• Make-before-break contact design allows switching without power interruption