Blue Sea Systems e-Series Dual Circuit Plus Battery Switch, Compact Ignition-Protected with Combine Function

The Blue Sea Systems e-Series Dual Circuit Plus battery switch provides independent on/off control of two battery banks with a combine function for emergency or boosted power.

Compact and engineered for marine use, this e-Series Dual Circuit Plus switch lets you manage a separate starting and house battery while preserving space and installation flexibility. Its ignition-protected design and durable tin-plated copper studs make it suitable for gasoline-powered engine compartments, and the textured face helps with tactile operation in dimly lit conditions.

How does this switch keep two battery banks separate yet allow combined power?

The switch gives you individual ON/OFF positions for each bank and a COMBINE option to link both outputs when extra capacity or a single supply is needed. Combining lets you draw from or charge both banks together while returning each to its normal state when no longer required.

• Independent positions for two battery banks (house and start)
• COMBINE setting to join outputs during low-voltage or charging situations
• Tin-plated copper studs accept multiple cable terminations securely
• One-piece studs are 7/8" long for ample connection length

Where can I mount the e-Series Dual Circuit Plus on my boat?

Designed for flexible installation, the switch can be surface-mounted or panel-mounted from the rear depending on your dash or equipment layout. Its compact footprint helps fit into crowded switch banks or tight engine-room corners without sacrificing accessibility.

• Surface-mount option for external panels or bulkheads
• Rear-panel mounting for a clean finished look
• Compact housing fits into small spaces behind instrument panels
• Ignition protection allows engine-room placement in gasoline boats

What electrical and practical features should I expect from this model?

This model focuses on reliable connections and user-friendly operation rather than alternator-field disconnect capability. It uses long, tin-plated copper studs to maintain low-resistance contacts and accepts multiple cables for complex wiring setups. The textured face aids locating and turning the switch in low light or when visibility is limited.

• Ignition-protected for safe engine-room use in gasoline-powered craft
• Tactile textured face for operation without direct light
• Does not include alternator field disconnect functionality
• Durable construction for marine electrical environments

How will this switch fit into my battery charging and starting layout?

The switch integrates into typical dual-bank systems to route charging to the desired battery or to isolate one bank for maintenance. During routine operation you can keep the start battery dedicated to engines while using the house bank for accessories, then combine when charging or emergency starting is needed.

• Keep start and house banks isolated during normal use
• Combine banks for charging from a single alternator or emergency starts
• Allows multiple cable connections for parallel circuits or bus ties
• Compact size simplifies retrofit into existing electrical panels

Who is this for: The Blue Sea Systems e-Series Dual Circuit Plus is aimed at boat owners, marine electricians, and DIY installers who need dependable two-bank battery control in limited spaces. It’s ideal for vessels that require ignition-protected components in gasoline engine compartments and for systems where multiple cable connections and tactile operation in low light are practical necessities. If you need alternator field disconnecting, consider a different model; otherwise, this switch offers a robust, space-saving solution for managing start and house batteries.