Blue Sea 11001 e-Series Battery Switch w/Alternator Field Disconnect - 3-Position

The Blue Sea 11001 e-Series Battery Switch with Alternator Field Disconnect is a marine-grade electrical selector engineered for cruising boats, fishing vessels, and any multi-battery system where reliable power management is non-negotiable. After years on the water, experienced captains and boat owners know that a single electrical failure can strand you far from port—this three-position switch eliminates that risk by allowing seamless transitions between independent battery banks without losing ignition or critical systems power. Whether you're running overnight trolling runs, anchoring in remote locations, or relying on auxiliary power for navigation and safety equipment, this switch delivers the redundancy and control that separates preparedness from regret.

The e-Series design features make-before-break contact technology, meaning electrical connections are established to the next battery bank before the previous one is disconnected—preventing the momentary power loss that can reset electronics, kill running engines, or interrupt critical instruments. The integral Alternator Field Disconnect (AFD) automatically isolates the alternator when the battery switch reaches the OFF position, protecting charging systems from voltage spikes and reverse polarity damage during engine shutdown or emergency power cuts. Built to CE standards and ignition-protected for safe operation in enclosed engine compartments, this switch combines solid-state reliability with the rugged construction demanded by saltwater and freshwater environments alike.

Ideal for center console boats, trawlers, sailboats with auxiliary power, and any vessel carrying dual battery banks or reserve starting systems, the Blue Sea 11001 integrates into standard electrical panels with straightforward wiring and minimal installation footprint. Its compact 7 x 3 x 9-inch profile fits easily into tight engine compartments while remaining accessible for quick operation during cruising or emergency situations. Marine electricians and experienced DIY installers appreciate the clear three-position design—allowing selection of Bank 1, Bank 2, or OFF modes with absolute certainty, eliminating confusion when conditions demand immediate decisions.