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Blue Sea Systems 3003 Heavy Duty Battery Switch with Alternator Field Disconnect, 1-2-Off-Both, Beige

Free shipping on orders over $29.99

$74.01

$ 29 .99 $29.99

In Stock

About this item

  • Switches isolated battery banks to all loads or combines battery banks to all loads. Includes AFD (Alternator Field Disconnect)
  • Ignition protected—safe for installation aboard gasoline powered boats
  • IP66 waterproof, ISO 8846 and meets ABYC requirements
  • Accepts two 4/0 AWG (95mm²) battery cables. Terminal Stud Size: 1/2"
  • Continuous Rating: 500A, Max Voltage: 32VDC


Great Product


Sandu Panus
Reviewed in the United States on February 27, 2018
Best quality, universal, easy to install and very reliable
Ian Wilcox
Reviewed in the United States on December 10, 2018
Used to install a dual battery system in my K5. Worked exactly as intended. However, my alternator is an internal regulator so I could not utilize the A.F.D (Alternator Field Disconnect) as I was intending. Not a fault of the product or seller. But I would have ordered the non-AFD unit if I had seen this before ordering. Build quality is excellent, and the switch has a very positive feel without being to hard to switch when in the engine bay. I ran 2/0 cable with 1/2" cable ends and it easily fit underneath when mounted. Could easily go to bigger cable if needed for your application. All Blue Sea products are top notch and they are my first stop for anything electrical.
Jeff Whitman
Reviewed in Canada on September 4, 2016
Great product. Excellent quality.
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