Blue Sea Main Battery Switch 1-2-OFF-BOTH Red HD Series

Blue Sea Main Battery Switch 1-2-OFF-BOTH Red HD Series is a heavy-duty battery selector switch that allows you to manage, select, or combine two separate battery banks using a single control. It is specifically designed for high-current marine installations where maximum reliability, safety, and flexible power management are essential. Looking for a powerful main battery switch for a larger boat or demanding electrical system? The Blue Sea HD Series 1-2-OFF-BOTH switch lets you use each battery bank independently or together, helping you optimize power usage and ensure sufficient cranking power under all conditions. Flexible battery management with a single switch The four-position switch allows you to select battery 1, battery 2, both battery banks, or completely disconnect power. This makes system management simple and efficient, especially during long trips at sea. In the BOTH position, the battery banks are combined, providing maximum available capacity and highest starting power when needed. Seamless switching between battery banks The “make before break” design allows switching between battery banks without interrupting power. This protects sensitive marine electronics such as chartplotters, navigation systems, and communication equipment from shutdown during switching. This feature is especially important on boats where continuous power is critical for safe navigation and onboard systems. Designed for very high current loads The HD Series is engineered to handle continuous loads up to 500 A and cranking currents up to 1600 A. This makes it ideal for large diesel engines, heavy-duty electrical systems, and professional marine applications. The switch supports dual 95 mm² cable connections per terminal, ensuring maximum current capacity and efficient power transfer. Rugged and safe HD Series construction The ignition-protected design makes the switch safe for installation in gasoline-powered boats. Heavy-duty M12 terminals, high-quality materials, and Blue Sea Systems’ proven engineering ensure long service life even in harsh marine environments. Features: • 1-2-OFF-BOTH main battery switch • Controls two separate battery banks with one switch • Ability to combine battery banks • “Make before break” switching function • Ignition-protected design • Suitable for gasoline-powered boats • Designed for high-current systems • Supports dual cable connections per terminal • Heavy-duty HD Series construction Technical Specifications: • Switch type: Rotary selector, 4-position • Positions: 1 / 2 / OFF / BOTH • Color: Grey housing, red handle • Battery combining: Yes • Alternator field disconnect: No • Max voltage: 32 V DC • Continuous current: 500 A • Intermittent current (5 min): 700 A • Cranking current (30 sec): 1600 A • Battery connections: 2 • Terminal bolt: M12 • Tightening torque: 24.86 Nm • Max cable size: 107 mm² • Cable seal diameter: 27.94 mm • Dual cables per terminal for maximum capacity • Mounting: M6 screw compatible • Weight: 0.57 kg The Blue Sea Main Battery Switch 1-2-OFF-BOTH Red HD Series is an excellent choice for boat owners who need maximum performance and flexible dual-battery control. Its high current capacity, safe construction, and seamless switching capability make it a reliable solution for both recreational and professional marine electrical systems.