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Blue Sea Systems 9003E e-Series Battery Switch, On/Off, Red

4.7 4.7 out of 5 stars 589 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Boat Battery Switches by Blue Sea Systems

To see product details, add this item to your cart. You can always remove it later.
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Switch
On-off

Purchase options and add-ons

Switch Type
Temperature Switch
Material
Metal

About this item

  • Single Circuit ON-OFF. Switches a single battery to a single load group
  • Ignition protected—safe for installation aboard gasoline powered boats
  • IP66 waterproof, ISO 8846 and meets ABYC requirements
  • Terminal Stud Size: 3/8" - 16
  • Continuous rating: 350A, Maximum voltage: 48V DC

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.9 x 6.38 x 8.63 inches; 0.07 ounces
  • Item model number ‏ : ‎ 9003E-BSS
  • Department ‏ : ‎ Unisex-Adult
  • National Stock Number ‏ : ‎ 5930-01-543-3693
  • Date First Available ‏ : ‎ October 1, 2001
  • Manufacturer ‏ : ‎ BLUE SEA SYSTEMS
  • ASIN ‏ : ‎ B000MMC914
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.7 4.7 out of 5 stars 589 ratings

WARNING:

CHOKING HAZARD -- This toy is a marble. Not for children under 3 yrs.

Product Description

GREAT PRODUCT

Important information

Legal Disclaimer

ITS A USED ITEM


From the manufacturer

Blue Sea Systems 350 Amp E-Series Battery Switches

Details

  • Tin-plated copper studs for maximum conductivity and corrosion resistance
  • Accepts up to 4/0 AWG battery cables
  • Studs accepts 3/8" (M10) ring terminals
  • 7/8" (22mm) stud length accepts multiple cable terminals
  • Blue Sea Systems one-piece terminal stud design never loosens over time
  • Fits most Perko and Guest low amperage battery switch hole patterns
  • Case design allows surface, rear, or front panel mounting options
  • Tactile indicator conveys knob position by feel

e-Series On Off Battery Switch

Switches a single battery to a single load group

  • Ignition protected—safe for installation aboard gasoline powered boats
  • Case design allows surface or rear panel mounting

What's in the box

  • BATTERY SWITCH ON/OFF
  • Looking for specific info?

    Customer reviews

    4.7 out of 5 stars
    4.7 out of 5
    589 global ratings

    Customers say

    Customers like the quality, performance, battery drain and ease of installation of the electronic switch. For example, they mention it's a solid product built real well, it works great for a battery to AC inverter and that it helps keep their batteries topped off. They appreciate value, and appearance. Opinions are mixed on size.

    AI-generated from the text of customer reviews

    52 customers mention52 positive0 negative

    Customers are satisfied with the quality of the electronic switch. They mention that it is a solid product built real well, with a tough plastic housing. They also say that it's high quality, very durable, and stout. Some say that the switch has a strong enough circuit to allow starting a 555 cubic.

    "...It’s a big switch (4”x4”) but found just enough room for it. Feels very high quality and works well." Read more

    "The switch was a breeze to install, feels very solid, and I expect it to last a long time...." Read more

    "...The switch is heavy duty inside and out. Opened my hole through the carpeted wall ..fit this in ..used my own hardware and wired it in...." Read more

    "Everything about this item was positive. The switch is built like a tank and works great...." Read more

    31 customers mention31 positive0 negative

    Customers are satisfied with the performance of the electronic switch. They mention that it works well, it's excellent in execution, and it'll work perfectly for a set of batteries. The switch operates smoothly and securely, and is heavy duty. Overall, most are happy with the product's performance and recommend it to others.

    "...Feels very high quality and works well." Read more

    "Check the size, its much bigger than I expected. Yes it works very well, but why so huge ??" Read more

    "...Works perfectly.blue seas rocks 10 stars" Read more

    "...The switch is built like a tank and works great. I used this item to cut power off on my boat when not in use. Worked perfect." Read more

    12 customers mention12 positive0 negative

    Customers are satisfied with the battery drain of the switch. They mention that it's an excellent battery switch, impressive battery saver, and amazing. They are happy with the way it has helped keep their batteries topped off, and kills all drain from the main battery. It is a nice replacement upgrade to RV switch, and has solved battery trickle problem.

    "...It's worked great so far; no battery drain after leaving the boat for a month...." Read more

    "...This switch is amazing!" Read more

    "...while current is flowing, but good to know that the switch is capable of handling anything that the golf cart can produce...." Read more

    "...organized the nightmare of wires and cables as well as kills all drain from the main battery." Read more

    9 customers mention9 positive0 negative

    Customers find the installation process of the electronic switch to be easy. They mention that it works as intended, is easy to mount, and is great value for your dollar.

    "...Easy to install" Read more

    "The switch was a breeze to install, feels very solid, and I expect it to last a long time...." Read more

    "Unit is easy to install." Read more

    "Works as intended. Easy to mount...." Read more

    9 customers mention9 positive0 negative

    Customers appreciate the value of the electronic switch. They say it is a great product and good value for the money.

    "...I recommend this product. Price was reasonable too." Read more

    "...Larger, so covered up old mouting holes. For this application, well worth the money. Highly recommend." Read more

    "Great value for the price. I run up to 300 amps thru this switch with no arcing. Switched during no-load periods to reduce pitting of contacts." Read more

    "Good price, fast delivery." Read more

    4 customers mention4 positive0 negative

    Customers like the appearance of the electronic switch. They mention it's simple in design, easy to see and read, and keeps it looking professional.

    "...The ability to flush-mount it worked great and keeps it looking professional...." Read more

    "...It’s large, easy to see and read, and operates very smoothly...." Read more

    "This is a big beefy switch that's made like a tank. simple in design - it just works - and excellent in execution with great build quality...." Read more

    "Well built and designed. The stand-off feet provided plenty of room to attach 2-gauge battery cabling." Read more

    4 customers mention4 positive0 negative

    Customers are satisfied with the mount of the electronic switch. They mention that it is high quality, mounts either from back or in surface, and is heavy duty. The ability to flush-mount it works great and keeps it looking professional.

    "...The ability to flush-mount it worked great and keeps it looking professional...." Read more

    "...grabbed this switch for the troller.its heavy duty ..made for flush mount or outside mount. The switch is heavy duty inside and out...." Read more

    "...High quality, mounts either from back or in surface." Read more

    "...What else matters? Mounts from behind or on surface. I happy with it. Oh, and note the higher voltage capability!" Read more

    13 customers mention6 positive7 negative

    Customers are mixed about the size of the electronic switch. Some mention it's heavy duty, but is huge, and provides plenty of room to attach 2-gauge battery cabling. However, others say that it'll most likely have different mounting screws and the posted dimensions are incorrect.

    "...It’s large, easy to see and read, and operates very smoothly...." Read more

    "Check the size, its much bigger than I expected. Yes it works very well, but why so huge ??" Read more

    "...duty version of their battery switches and this switch can easily accommodate 4/0 cable and lugs which was very important for my application...." Read more

    "...It is bigger than I thought, but very well made so I used it anyway." Read more

    Very stout switch
    5 Stars
    Very stout switch
    Used for a winch cutoff switch. It’s a big switch (4”x4”) but found just enough room for it. Feels very high quality and works well.
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    Top reviews from the United States

    Reviewed in the United States on January 22, 2024
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Customer image
    5.0 out of 5 stars Very stout switch
    Reviewed in the United States on January 22, 2024
    Used for a winch cutoff switch. It’s a big switch (4”x4”) but found just enough room for it. Feels very high quality and works well.
    Images in this review
    Customer image
    Customer image
    Reviewed in the United States on December 21, 2023
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Reviewed in the United States on May 11, 2014
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Customer image
    5.0 out of 5 stars Solved battery trickle problem, strong with nice flush mount
    Reviewed in the United States on May 11, 2014
    The switch was a breeze to install, feels very solid, and I expect it to last a long time. I'm sure this is a little over-kill for my single marine battery, but I'm willing to pay an extra twenty bucks for peace of mind. This switch has a very high threshold for the load of amps that occur upon starting the engine, and it's size and weight imply that I won't be replacing it any time soon. The ability to flush-mount it worked great and keeps it looking professional.

    Regarding my specific setup: I have a standard marine battery running to a 120hp Yamaha outboard. For the last couple seasons I have had an issue with the battery dying if I didn't use the boat for several weeks. Physically disconnecting the battery terminals after using the boat solved the problem, but it wasn't the most user-friendly solution for the rest of the family. The issue suggests a larger trickle from the battery than there should be, but it's not worth my time or money to figure out what device is pulling current even when the key is off. So the solution was to get a simple switch that does the same thing as physically disconnecting from the terminals. It's worked great so far; no battery drain after leaving the boat for a month.

    Originally I intended to mount it below the dashboard, but I ended up taking more simple route and mounted it closer to the battery in one of the compartments under a back seat. I used a 3 5/8" hole saw to cut through the plastic wall of the seat, about halfway up from the floor. Then I pushed the switch into the hole, marked the four locations of the bolts, drilled four small holes, and mounted the switch with four nuts and bolts.

    NOTE, I needed the following extra materials to install the switch:
    1. 3 5/8" hole saw (not needed unless flush-mounting, and you could use a different tool too)
    2. Four bolts and nuts (at least 3.5" in length, I forget the diameter)
    3. Wire and crimp-connectors to extend the wire from the battery to where I mounted the switch, remember that you only need to extend the positive (+) cable to the switch)
    Images in this review
    Customer image Customer image Customer image Customer image Customer image Customer image
    Customer imageCustomer imageCustomer imageCustomer imageCustomer imageCustomer image
    24 people found this helpful
    Report
    Reviewed in the United States on May 27, 2023
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Reviewed in the United States on June 8, 2022
    Pattern Name: SwitchStyle: On-offVerified Purchase
    2 people found this helpful
    Report
    Reviewed in the United States on March 6, 2024
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Reviewed in the United States on May 28, 2023
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Reviewed in the United States on August 3, 2023
    Pattern Name: SwitchStyle: On-offVerified Purchase

    Top reviews from other countries

    Translate all reviews to English
    Richard T.
    5.0 out of 5 stars Quality Item
    Reviewed in Germany on October 6, 2020
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Joan
    5.0 out of 5 stars Parfait
    Reviewed in France on October 18, 2019
    Pattern Name: SwitchStyle: On-offVerified Purchase
    One person found this helpful
    Report
    KH
    4.0 out of 5 stars 抵抗値を85%低減できました。
    Reviewed in Japan on July 19, 2022
    Pattern Name: SwitchStyle: On-offVerified Purchase
    Ben Pye
    5.0 out of 5 stars I would certainly buy more of these
    Reviewed in Australia on June 30, 2020
    Pattern Name: SwitchStyle: On-offVerified Purchase
    chocky
    5.0 out of 5 stars Best battery switch for your boat with big engines
    Reviewed in the United Kingdom on August 6, 2013
    Pattern Name: SwitchStyle: On-offVerified Purchase