Defender Home Page
Phone: 800-628-8225 Fax: 800-654-1616 Int'l.: 860-701-3400 Email: Contact Us
Follow us on Facebook
Shipping Info
Defender Home Page
Your Cart
null View Cart View Shopping Cart
null Check My Order(s)
null Track My Package(s)
Conversion Chart
Shopping Areas
Boats & Motors
null Defender Seal null
promo A
promo B
promo C
promo D
Blue Sea Systems HD-Series Selector Battery Switch with AFD

Blue Sea Systems HD-Series Selector Battery Switch with AFD

  • Switches Isolated Battery Banks or Combines Battery Banks to All Loads
  • Continuous Rating: 500 Amps, Max. Voltage: 32 Volt DC
  • Ignition Protected, Make-Before-Break Contact Design
  • Item #: 
    Blue Sea Systems
    Model #: 


    Shipping Weight: 
    1.30 Lbs.
    List Price: 
    Our Price:
    Status:  null In Stock

    Quantity : 

    NOTE: Due to a recent fire at Blue Sea's facility, the lead time on out-of-stock Blue Sea products is longer than normal. We are unable to provide exact dates for each item, but Blue Sea expects to be caught up on orders by July.

    Blue Sea® Systems HD-Series Heavy Duty Selector 4-Position Battery Switch with Alternator Field Disconnect (AFD)


    • Switches isolated battery banks to all loads or combines battery banks to all loads
    • Make-before-break contact design allows switching between battery banks without power interruption
    • Includes Alternator Field Disconnect (AFD) – protects diodes in alternator in the event of the switch being switched to the OFF position while engine is running
    • Up to 500 Amps continuous rating for large diesel engines, high power output and low heat generation
    • Ignition protected – safe for installation aboard gasoline powered boats
    • Case design allows surface or rear panel mounting options
    • Accepts (2) 4/0 AWG battery cables
    • Tin-plated copper studs for maximum conductivity and corrosion resistance
    • Terminal studs accept 1/2" (M12) ring terminals
    • 7/8" stud length accepts multiple cable terminals
    • Blue Sea Systems one-piece terminal stud design never loosens over time
    • One-piece stainless steel flange nuts ensure safe and secure connections
    • Fits most Perko and Guest low-amperage battery switch hole patterns
    • Tactile indicator conveys knob position by feel
    • Blue Sea Systems stands behind its products for as long as you own them


    • Blue Sea Systems Model No. 3003
    • Switch Type: Selector 4 Position
    • Color: Gray
    • Alternator Field Disconnect: Yes
    • Cranking Rating (30 sec.): 1600 Amps
    • Intermittent Rating (5 min.): 700 Amps
    • Continuous Rating: 500 Amps
    • Maximum Operating Voltage: 32 Volt DC
    • Regulatory:
      • Meets UL 1500 and SAE J1171 external ignition protection requirements
      • Ingress Protection IP66 - dustproof / protected against heavy seas and jets of water from all directions
      • CE marked, ISO 8846, UL Listed - UL 1107 electric power switches
      • Meets American Boat and Yacht Council (ABYC) requirements for battery switches

    For more information see Instructions for Use


    Have A Suggestion?

    Help us make our site better for everyone! Let us know you've found something wrong or frustrating on this page and we will improve it. Please mark each that apply.

    Product has been improperly categorized
    Page loads too slowly
    Product information is incorrect
    Page has errors or bugs
    Site is frustrating or difficult to use
    Product image is missing or wrong
    Cannot find my size
    Spelling errors on page
    Not enough product information

    Comments or Examples:
    Examples: Missing information such as dimensions and model number, typos, inaccuracies, etc...

    Please include your e-mail address below if you would like us to respond to your comments or questions.             

    Join Our Email List And Receive our Monthly Promotions
    Defender Email Specials
    Click Here For Our Privacy Policy