Blue Sea e-Series On Off Battery Switch (BS9003E)
The Blue Sea e-Series On/Off Battery Switch (BS9003E) is a high-performance battery isolator switch, designed to provide safe and reliable power control for marine, campervan, motorhome, and off-grid energy systems. Built with durability in mind, this heavy-duty battery disconnect switch ensures complete isolation of your electrical system, preventing power drain and enhancing safety.
Featuring a rugged, ignition-protected design, the BS9003E battery switch is ideal for use in harsh environments, making it perfect for boats, yachts, 4×4 vehicles, RVs, and off-grid solar installations. The simple On/Off function allows for easy operation, giving you complete control over your 12v, 24v, or 48v battery system.
This Blue Sea Systems battery switch is rated for continuous operation, capable of handling high amperage loads while maintaining optimal efficiency. It is built with corrosion-resistant materials, ensuring long-term reliability in demanding off-grid and marine applications.
Whether you’re upgrading your campervan electrical setup, enhancing your solar power storage, or improving marine battery management, the Blue Sea e-Series BS9003E Battery Switch is an essential component for efficient and safe power distribution.
Key Features:
- Heavy-duty battery switch for marine, campervan, and off-grid applications
- On/Off functionality for complete power isolation and safety
- Ignition protected – safe for installation in petrol-powered environments
- Corrosion-resistant materials for durability in harsh conditions
- Compatible with 12V, 24V, and 48V battery systems
- High-amperage capacity for continuous and reliable operation
Upgrade your off-grid power system with the Blue Sea e-Series On/Off Battery Switch (BS9003E) and experience safe, efficient, and reliable battery management.












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