Sierra BS11020 Battery Switch 1-2-Both-Off Marine Battery Selector

The Sierra BS11020 is a heavy-duty marine battery selector switch designed for reliable power management on boats and marine applications. This versatile switch allows you to select between two batteries, use both simultaneously, or isolate all power with the OFF position—providing complete control over your electrical system.

Key Features:

• Four-position selector: 1-2-BOTH-OFF for flexible battery management
• Maximum voltage rating of 48VDC for safe operation across various systems
• Tin-plated copper battery studs resist corrosion in marine environments
• Heavy-duty design accepts up to 4/0 AWG cable for high-current applications
• Stud torque specification: 120 lb-in for secure electrical connections
• Removable ergonomic knob provides an additional level of safety and theft deterrence
• Robust glass fiber reinforced nylon enclosure withstands harsh marine conditions
• Removable access windows on all four sides simplify wiring and installation
• Versatile mounting options: surface mount or panel mount installation

This battery switch is an essential component for any marine electrical system, allowing you to extend battery life, prevent dead batteries, and ensure reliable power distribution. The removable knob feature adds security when the vessel is unattended.