attwood Marine Battery Selector Switch Single-Pole 4-Way — One Size, 150A/300A Continuous, Corrosion-Resistant

The Attwood 14230-3 is a single-pole, four-position marine battery selector that lets you choose battery 1, battery 2, both in parallel, or fully off with heavy-duty components built for saltwater use.

When you need dependable, flexible power control on a boat, the Attwood 14230-3 provides a compact, easy-to-operate solution. This selector switch supports a wide voltage range and high continuous current ratings, with corrosion-resistant materials and an alternator field disconnect to reduce surge risk. It’s engineered to work in harsh marine environments and integrates into standard 6–32V DC systems with minimal fuss.

How does this switch manage multiple batteries safely?

The 14230-3 offers four clear positions—Battery 1, Battery 2, Both, and Off—so you can isolate, parallel, or cut power as needed without rewiring. A built-in alternator field circuit disconnect helps prevent harmful voltage spikes when switching between sources, protecting sensitive electronics. The mechanical construction uses materials chosen for marine durability to maintain reliable electrical contact under load.

• Four-position selector: battery 1, battery 2, both, off
• Automatic alternator field circuit disconnect reduces surge exposure
• Solid brass terminals and copper washers for consistent conductivity

What load and voltage ranges can it handle for boating use?

Designed for direct-current systems from 6 volts up to 32 volts, this switch covers most small craft and commercial marine electrical setups. It’s rated for heavy continuous loads—300 amps at 6V and 150 amps at 12V—so it suits starting and house battery duties depending on system configuration. These ratings reflect continuous operation capability rather than short-duration cranking peaks.

• Compatible with 6–32V DC systems
• 300 amps continuous at 6V; 150 amps continuous at 12V
• Appropriate for both starting and auxiliary battery circuits in many boats

What materials and construction features improve longevity in marine conditions?

Attwood built this selector with a Bakelite housing, solid brass terminals, and copper washers to resist corrosion and maintain reliable contact over time. The fixed, robust mechanical design reduces the chance of internal wear and connection failure in rough or wet environments. Fastening hardware and terminal nuts are selected for long-term durability in saltwater and humid conditions.

• Bakelite housing for electrical insulation and environmental resistance
• Solid brass terminals and nuts minimize corrosion and maintain conductivity
• Copper washers provide stable pressure and reduce arcing risk

How simple is installation and everyday operation on a boat?

Installation is straightforward for anyone familiar with marine DC wiring: mount the control, connect the three main battery/engine leads, and follow standard torque recommendations for terminal hardware. The knob provides distinct detents for each position so users can switch power sources quickly and confidently underway or at the dock. No special tools or programming are required.

• Standard three-lead wiring makes replacement or upgrade simple
• Clear knob positions for quick selection between power sources
• No electronics or configuration needed—mechanical operation only

Who is this for: The Attwood 14230-3 is aimed at boat owners, electricians, and marine service technicians who need a rugged, no-nonsense battery selector for small to medium craft. It’s a good fit when you require high continuous current capacity, straightforward manual switching, and materials chosen to resist the challenges of saltwater environments. Choose this switch if you want a durable, proven mechanical solution for controlling multiple batteries without adding complexity.