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 an excellent solution for boats with dedicated start and house batteries where high current capacity and flexible power management are required. Looking for a reliable battery selector for a powerful vessel? The Blue Sea HD Series main battery switch offers four operating positions, allowing you to use battery 1, battery 2, both batteries simultaneously, or disconnect power completely. This makes onboard electrical management simple and safe both in port and at sea. Flexible battery management with 1-2-BOTH selection The four-position switch makes it easy to select the desired battery bank depending on operational needs. You can run start and house batteries independently or combine them when maximum power output is required. The BOTH position is especially useful when extra capacity is needed for engine starting or high electrical loads. Seamless switching between battery banks The “make before break” function allows switching between battery banks without interrupting power. This protects marine electronics and prevents shutdowns of navigation and communication systems during battery selection changes. This feature is especially valuable on boats with sensitive electronics that require continuous power supply. Built for high current systems The HD Series main battery switch handles up to 350 A continuous load and very high cranking currents, making it suitable for powerful boats, workboats, and large electrical systems. Its design supports connection of two large 95 mm² (4/0 AWG) cables, simplifying installation in high-current applications. Flexible mounting and rugged construction The housing supports both front and rear panel mounting. Blue Sea Systems’ proven marine-grade construction ensures long service life even in harsh environments. Features: • Main battery switch with 1-2-OFF-BOTH positions • Controls two battery banks with a single switch • Allows combining of battery banks • “Make before break” switching • Suitable for start and house battery systems • Front or rear panel mounting • Designed for high-current applications • Clearly visible red operating handle Technical Specifications: • Switch type: 4-position battery selector • Positions: 1 / 2 / OFF / BOTH • Color: Red • Battery combining: Yes • Alternator field disconnect: No • Max voltage: 32 V DC • Continuous current: 350 A • Intermittent current (5 min): 600 A • Cranking current (30 sec): 1200 A • Battery connections: 2 • Terminal studs: M10 • Tightening torque: 15.82 Nm • Max cable size: 107 mm² • Cable seal diameter: 27.94 mm • Supports dual 95 mm² (4/0 AWG) cable connections • Mounting: M6 screw compatible • Weight: 0.59 kg The Blue Sea Main Battery Switch 1-2-OFF-BOTH Red HD Series is an excellent choice for boat owners who need a powerful and flexible solution for managing two battery banks. Its high current capacity, seamless switching capability, and robust marine-grade design make it a dependable component in demanding electrical systems.