--- product_id: 8376872 title: "9003E e-Series Single Circuit On/Off Compact Battery Switch, 32V DC, 325A, Red" brand: "blue sea systems" price: "€ 81.07" currency: EUR in_stock: true reviews_count: 13 category: "Blue Sea Systems" url: https://www.desertcart.be/products/8376872-9003e-e-series-single-circuit-on-off-compact-battery-switch store_origin: BE region: Belgium --- # Tactile switch for no-light use 325A heavy-duty current rating Compact & versatile mounting 9003E e-Series Single Circuit On/Off Compact Battery Switch, 32V DC, 325A, Red **Brand:** blue sea systems **Price:** € 81.07 **Availability:** βœ… In Stock ## Summary > πŸ”΄ Switch smart, power strong β€” never miss a beat on the water or road! ## Quick Answers - **What is this?** 9003E e-Series Single Circuit On/Off Compact Battery Switch, 32V DC, 325A, Red by blue sea systems - **How much does it cost?** € 81.07 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/8376872-9003e-e-series-single-circuit-on-off-compact-battery-switch) ## Best For - blue sea systems enthusiasts ## Why This Product - Trusted blue sea systems brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Engine Room Ready:** Ignition protected for safe installation even in gasoline engine compartments. - β€’ **Operate Blindfolded:** Tactile textured knob lets you switch on/off easily in low or no light conditions. - β€’ **Power Through with Confidence:** Handles up to 325 amps for robust marine and RV power management. - β€’ **Fits Anywhere, Installs Everywhere:** Compact design with multiple mounting options for tight or tricky spaces. - β€’ **Secure Connections, Zero Resistance:** One-piece tin-plated copper studs accept multiple cables and ensure minimal power loss. ## Overview The Blue Sea Systems 9003E e-Series Single Circuit Battery Switch is a compact, ignition-protected rotary switch rated for 32V DC and 325A continuous current. Designed for marine and RV applications, it offers versatile mounting options, tactile controls for low-light operation, and robust copper studs that accept multiple cables for secure, low-resistance connections. Ideal for isolating or combining battery banks, it ensures reliable power management in tight spaces and harsh environments. ## Description A compact battery switch that offers multiple installation options. Switches isolated battery banks to all loads or combines battery banks to all loads. Blue Sea Systems e-Series battery switches can be installed in a variety of locations. Their compact footprint and two mounting options make installation easy. They are ignition protected and can be located in the engine rooms of gasoline powered boats. This version does not include an alternator field disconnect to protect the alternator diodes from damage if the switch is accidently turned to the OFF position while the engine is running. The tactile texture of the switch face and knob allow operation by feel in low or no light situations. The one piece tin-plated copper terminal studs are long enough to accept multiple cables and will accept the torque required to create a secure connection that minimizes resistance. Review: Blue Sea Systems 9003e Battery Disconnect Switch On/Off Type - The Blue Sea Systems 9003e battery disconnect switch is very high quality with a solid feel and tough plastic housing. I ordered this switch for my electric golf cart. The voltage rating of the switch exactly matches my 48 volt system and far above the 200 amp maximum of the golf cart. I don't expect to be switching off the power while current is flowing, but good to know that the switch is capable of handling anything that the golf cart can produce. I mounted the switch from the rear with only the round face exposed for a more professional look; The minimum hole size is 3 5/8" to accept the round part of the switch; had to borrow this large size hole saw from a contractor. The studs on the back are 3/8" diameter and easy to access. The only thing that could be better is if it came with a non-metallic cover plate for the back to protect against accidental contact with the studs; This is not an issue for those who are surface mounting the switch. All golf carts should come with a maintenance switch like this. I can now be assured that there are no parasitic current draws on the battery pack when not in use. You just have to remember to turn it back on when charging or when you want to use the cart! Review: Solid switch. If mounting like in the photo I posted, buy 3 5/8 inch hole saw - As stated, you need a 3 5/8 inch hole saw to lake this a perfect flush mount. I read somewhere to "use a 3.5 inch hole saw, then use a rotary tool to finish the hole". That's pure garbage. It'll only booger up your hole. The switch itself is solid and well built. I'm using it on my overlanding solar array with two LiFePO4 230ah batteries and a 3000 watt inverter. The switch will be used to disconnect the house batteries from the alternator when I need everything my alternator can throw out when using my 12,000 lb winch. ## Features - Compact design makes installation in tight places easy - Multiple mounting options; can be installed on the surface or rear of the panel - Ignition protected and can be mounted in the engine room of gasoline powered boats - One piece copper studs are 7/8" long and accept multiple cables - Tactile textures on face let operate the switch in low or no light ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000MMC914 | | Actuator Type | Rotary | | Best Sellers Rank | #9,041 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #3 in Boat Battery Switches | | Brand Name | Blue Sea Systems | | Circuit Type | 1-way | | Color | Red | | Compatible Devices | Boat lights, Boat horns, Other marine electrical devices | | Compatible with Vehicle Type | Marine Boat | | Connectivity Protocol | X-10 | | Connector Type | Idc | | Contact Material | Stainless Steel | | Contact Type | Normally Open | | Control Method | Touch | | Control Type | On/Off | | Controller Type | Ring | | Current Rating | 1 Microamps | | Customer Reviews | 4.7 4.7 out of 5 stars (708) | | Global Trade Identification Number | 00632085900359 | | Included Components | BATTERY SWITCH ON/OFF | | International Protection Rating | IP66 | | Item Dimensions | 2.9 x 6.38 x 8.63 inches | | Item Type Name | BATTERY SWITCH ON/OFF | | Item Weight | 0.59 Kilograms | | Lower Temperature Rating | 1 Degrees Celsius | | Manufacturer | Blue Sea Systems - Sports | | Material Type | Metal | | Model | 9003e | | Mounting Type | Panel Mount | | Number of Items | 1 | | Number of Positions | 1 | | Operating Voltage | 48 Volts | | Operation Mode | ON-OFF-ON | | Part Number | 9003e | | Smart Home Compatibility | Not Smart Home Compatible | | Switch Type | Temperature Switch | | Terminal | Spdt | | UPC | 632085900359 | | Unit Count | 1.0 Count | | Upper Temperature Rating | 1 Degrees Fahrenheit | | Warranty Description | LIMITED WARRANTY | | Wattage | 16800 watts | ## Product Details - **Brand:** Blue Sea Systems - **Connector Type:** Idc - **Contact Type:** Normally Open - **Current Rating:** 1 Microamps - **Item dimensions L x W x H:** 2.9 x 6.38 x 8.63 inches - **Material:** Metal - **Operating Voltage:** 48 Volts - **Operation Mode:** ON-OFF-ON - **Switch Type:** Temperature Switch - **Terminal:** Spdt ## Images ![9003E e-Series Single Circuit On/Off Compact Battery Switch, 32V DC, 325A, Red - Image 1](https://m.media-amazon.com/images/I/81oD4fs1tCL.jpg) ## Available Options This product comes in different **Pattern, Style** options. ## Questions & Answers **Q: I'm considering using this as a battery isolator for a winch on my Jeep. Can it handle the current? and what are the physical dimensions?** A: Your winch maker will list amperage for various amounts of load. Also switches will show three amperages they can tolerate for different amounts of time. So this switch is rated for 350 amps "continuous" (ie on for hours or permanently) 600 amps "intermittent" (for five minutes according to specs), and 1,200 amps "cranking"/peak for 30 seconds. OK so my SmittyBilt 9500 XRC Generation 3 winch has the following draws: 80 amps pulling zero lbs (winding rope in), 160 amps pulling 2,000 lbs, 220 amps pulling 4,000 lbs, 280 amps pulling 6,000, 340 amps pulling 8,000 lbs, and 385 amps pulling maximum of 9,500 lbs. H20 smitty and Second Gen XRC smitty use about 10% more amps. Also you "should" have a safety margin of 20%, ie no more than 80%. Now that means switch is ok continious running my winch are 2/3 of max load, and switch is fine running extreme max of winch load five minutes, five minutes rest, five minutes run, etc. BUT if you are anywhere over 50% of winch capacity/load you are going to run winch five minutes and rest the winch for five minutes anyway. so if your numbers are like mine you are ok. Check your winch makers specs on their website. Look until you find all numbers for the range of loads since the basic single amperage number they will list will be about 60% of max. I would say 90% of up to 12,000 lb winches are ok with this switch. But that presupposes you have at least read up on winching and know that you will damage your winch if you pull at max for more than four or five minutes. goodluck. PS blue sea's web page lists the contentious, intermittent five minutes and peak 20 seconds for all its switches. The other red "m" model is 300 continuous, this "E" is 350 continuous, and the gray one is 600, 900,1750 **Q: where can I get wiring instructions with diagram?** A: You tube has a few I found helpful. **Q: Package says it’s compatible with up to 4/0 awg. my batter bank is 200a lithium tuning through 2/0 awg wire to my bus bar. will this switch work?** A: It is compatible with any wire that fits the terminals. AWG 4, 2, or 0. The important thing is the current and voltage. At 48 volts this switch should be good at 233 amps continuously. Here is my complete review: Fabulous switch. I have mine on my golf car and switch between two 48 volt battery banks; It is specified at Continuous rating: 350A, Maximum voltage: 32V DC. Doing the math: Power = Current x Voltage. Thus, 350 x 32 = 11,200 Watts that this switch can handle. So, 11,200 / 48 = 233 Amps continuous ... at 48 volts this switch should be good at 233 amps continuously. see less **Q: What is alternator field disconnect vs the regular product without AFD? Looking to use on a camp trailer.** A: You do not need afd on a trailer, only on a vehicle with an alternator such as a motorhome or boat. It protects the alternator diodes upon disconnect. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Blue Sea Systems 9003e Battery Disconnect Switch On/Off Type *by S***N on January 5, 2014* The Blue Sea Systems 9003e battery disconnect switch is very high quality with a solid feel and tough plastic housing. I ordered this switch for my electric golf cart. The voltage rating of the switch exactly matches my 48 volt system and far above the 200 amp maximum of the golf cart. I don't expect to be switching off the power while current is flowing, but good to know that the switch is capable of handling anything that the golf cart can produce. I mounted the switch from the rear with only the round face exposed for a more professional look; The minimum hole size is 3 5/8" to accept the round part of the switch; had to borrow this large size hole saw from a contractor. The studs on the back are 3/8" diameter and easy to access. The only thing that could be better is if it came with a non-metallic cover plate for the back to protect against accidental contact with the studs; This is not an issue for those who are surface mounting the switch. All golf carts should come with a maintenance switch like this. I can now be assured that there are no parasitic current draws on the battery pack when not in use. You just have to remember to turn it back on when charging or when you want to use the cart! ### ⭐⭐⭐⭐⭐ Solid switch. If mounting like in the photo I posted, buy 3 5/8 inch hole saw *by D***T on May 23, 2024* As stated, you need a 3 5/8 inch hole saw to lake this a perfect flush mount. I read somewhere to "use a 3.5 inch hole saw, then use a rotary tool to finish the hole". That's pure garbage. It'll only booger up your hole. The switch itself is solid and well built. I'm using it on my overlanding solar array with two LiFePO4 230ah batteries and a 3000 watt inverter. The switch will be used to disconnect the house batteries from the alternator when I need everything my alternator can throw out when using my 12,000 lb winch. ### ⭐⭐⭐⭐⭐ Bow Thruster Shut-off *by J***P on July 10, 2025* Using this for an emergency shut off for my Side-Power SE60 bow thruster. Works great and a much more affordable option that factory original. ## Frequently Bought Together - Blue Sea Systems 9003E e-Series Battery Switch, On/Off, Red - Blue Sea Systems 5026 ST Blade Fuse Block 12 Circuit with Ground and Cover - 16 Gauge Marine Wire 16 AWG Marine Grade Wire Include 16AWG 120FT Red & 120FT Black,16 Gauge Tinned Copper Electrical Cable for Boat Automotive Speakers Lighting Solar Outdoor RV Camper Trailer --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/8376872-9003e-e-series-single-circuit-on-off-compact-battery-switch](https://www.desertcart.be/products/8376872-9003e-e-series-single-circuit-on-off-compact-battery-switch) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-04-29*