--- product_id: 315972177 title: "Fastronix 300A 1/2\" Severe Duty Master Battery Disconnect Switch with Face Plate" brand: "fastronix solutions" price: "€ 135.13" currency: EUR in_stock: true reviews_count: 5 category: "Fastronix Solutions" url: https://www.desertcart.hr/products/315972177-fastronix-300a-1-2-severe-duty-master-battery-disconnect-switch store_origin: HR region: Croatia --- # 300A continuous current 2000A intermittent surge IP67 sealed for harsh environments Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate **Brand:** fastronix solutions **Price:** € 135.13 **Availability:** ✅ In Stock ## Summary > ⚡ Power up your control with Fastronix — where durability meets precision! ## Quick Answers - **What is this?** Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate by fastronix solutions - **How much does it cost?** € 135.13 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/315972177-fastronix-300a-1-2-severe-duty-master-battery-disconnect-switch) ## Best For - fastronix solutions enthusiasts ## Why This Product - Trusted fastronix solutions brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pro-Grade Finish:** Pair with Fastronix 404-116 terminal covers for a sleek, professional look that signals quality and reliability. - • **Smart Auxiliary Control:** Independent 20A auxiliary studs let you power indicator lights or small accessories without compromising main circuit integrity. - • **Unmatched Power Handling:** Handles a solid 300A continuous and surges up to 2000A for 15 seconds—built for serious current demands. - • **Built to Brave the Elements:** IP67-rated sealed internals ensure flawless operation in dust, water, and extreme temperatures (-40°F to 185°F). - • **Flexible Dual Configuration:** Switch between single or dual pole setups with an anti-rotation index pin for rock-solid installation. ## Overview The Fastronix 300A Severe Duty Master Battery Disconnect Switch features robust 1/2" copper studs rated for 300A continuous and 2000A intermittent current at 24V, sealed to IP67 standards for extreme durability. Its versatile single or dual pole design includes auxiliary studs for accessory control, all housed in a rugged rotary switch with a professional faceplate, engineered for high-performance electrical applications in demanding environments. ## Description The Fastronix Severe Duty Battery disconnect is just what you need when switching high current applications. 1/2" copper studs allow up to 2000A for up to 15 seconds to be intermittently switched with a constant current rating of 300A at 24V. The sealed internals, designed to IP67 / IEC 529 standards, ensure reliability in the harshest environments. Smaller studs are controlled with the on/off switch but are completely independent of main studs. Operating temperature -40 to 185 degrees Fahrenheit. Review: GOOD QUALITY Review: This switch turns on and off with a pleasant, distinct "snick." I am running a 200amp alternator with two Optima batteries on my race car. It was easy to modify the switch handle of this product to accept a hinged extension rod connected to a remote kill-handle by the taillight outside of the car. This puts mod puts extra tension on the switch body, but this thing is so solid that it doesn't seen to care. ## Features - 1/2" Copper Main Studs Rated to 300A@12VDC Continuous and 2000A Intermittent - Can be Used in Single Pole or Dual Pole Configuration - Index Pin to Prevent Rotation after Installation - Optional Use Smaller Auxiliary Studs Rated to 20A@12VDC for Indicator Light or Small Accessory - Use with Fastronix 404-116 Terminal Covers for a Professional Installation ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07L2JRHRQ | | Actuator Type | Rotary | | Brand | Fastronix Solutions | | Circuit Type | 2-way | | Colour | Black | | Connectivity Protocol | Auxiliary | | Connector Type | auxiliary | | Contact Material | Copper | | Contact Type | Normally Open | | Controller Type | Push Button | | Current Rating | 300 Amps | | Customer Reviews | 4.7 4.7 out of 5 stars (323) | | International Protection Rating | IP67 | | Item Dimensions | 12.7 x 6.7 x 6.7 centimetres | | Item Weight | 0.01 Ounces | | Manufacturer | Fastronix Solutions | | Manufacturer Part Number | 303-004 | | Material | Copper | | Model Number | 300A | | Mounting Type | Face | | Number of Items | 1 | | Number of Positions | 1 | | Operating Voltage | 24 Volts | | Operation Mode | ON-OFF | | Specification Met | ip67 | | Switch Type | Rotary | | Terminal | Copper Stud | | UPC | 635414975837 | | Unit Count | 1.0 count | | Wattage | 3600 watts | ## Product Details - **Brand:** Fastronix Solutions - **Connector type:** auxiliary - **Contact type:** Normally Open - **Current rating:** 300 Amps - **Item dimensions L x W x H:** 12.7 x 6.7 x 6.7 centimetres - **Material:** Copper - **Operating voltage:** 24 Volts - **Operation mode:** ON-OFF - **Switch type:** Rotary - **Terminal:** Copper Stud ## Images ![Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate - Image 1](https://m.media-amazon.com/images/I/81G91zM5KZL.jpg) ![Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate - Image 2](https://m.media-amazon.com/images/I/815mYOy3WOL.jpg) ![Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate - Image 3](https://m.media-amazon.com/images/I/81sOWaD5yuL.jpg) ![Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate - Image 4](https://m.media-amazon.com/images/I/81+xM9u2MtL.jpg) ![Fastronix 300A 1/2" Severe Duty Master Battery Disconnect Switch with Face Plate - Image 5](https://m.media-amazon.com/images/I/81f+5eFA1cL.jpg) ## Questions & Answers **Q: Can you just hook the positive or negative battery cable to each stud and use it as a simple switch? Secondary terminals will be left unused** A: Yes. I use it as a switch to kill the battery circuit on my tractor. BTW. It's well built and sturdy. **Q: The lugs are 1/2" the biggest cables avaiable are 5/16" & is this switch overkill for a average car?** A: The average car will typically use the Fastronix 303-001 Master Disconnect Switch which is rated to 180A continuous and 1000A intermittent, however the estimated current load will ultimately determine which disconnect switch you should use. **Q: Is this offered in a 2 post insted of 4 post?** A: Not sure you need to research it more **Q: How do you install on a 08 frieightliner d60 4 battery setup?** A: I put these disconnects on a 4 battery setup on a Peterbilt. Freightliner is no different. Because of the excessive current flowing during starting, I split the batteries and put two switches on, one for each set of two batteries. I had to make some special cables, but it all works very well. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by K***N on 19 January 2026* GOOD QUALITY ### ⭐⭐⭐⭐⭐ Review *by C***N on 21 April 2023* This switch turns on and off with a pleasant, distinct "snick." I am running a 200amp alternator with two Optima batteries on my race car. It was easy to modify the switch handle of this product to accept a hinged extension rod connected to a remote kill-handle by the taillight outside of the car. This puts mod puts extra tension on the switch body, but this thing is so solid that it doesn't seen to care. ### ⭐⭐⭐⭐⭐ Review *by L***A on 7 January 2024* I like these battery disconnect switches and they work great and easily. The only drawback is the need to drill a hole to mount the main shaft through, which is just over a 1/2" in diameter. When drilling through the steel panels of construction equipment, this can be a real chore. Assembly and wiring is straight forward. There is a definite 'positive' click when you flip the switch, giving a solid confidence the switch is where you want it, either in the 'On' or 'OFF' position. ## Frequently Bought Together - Fastronix 300A 1/2" Severe Duty Battery Disconnect Switch with Face Plate - 10pcs 4 Awg - 3/8 (M10) Sanuke Wire Lugs 4 Gauge Ring Terminal Connectors Ends, UL Listed Heavy Duty for Battery Cable Lug Wire Electrical Eyelets with 3:1 Dual Wall Adhesive Heat Shrink - Fastronix 3/8" 2 Post (SPST) 180/1000 Amp High Current Battery Disconnect Switch --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/315972177-fastronix-300a-1-2-severe-duty-master-battery-disconnect-switch](https://www.desertcart.hr/products/315972177-fastronix-300a-1-2-severe-duty-master-battery-disconnect-switch) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-06-26*