--- product_id: 283879953 title: "Ampper Side Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator for Marine Car Boat RV ATV Vehicles (with Long Bolt)" brand: "ampper" price: "€ 14.12" currency: EUR in_stock: true reviews_count: 5 category: "Ampper" url: https://www.desertcart.pt/products/283879953-ampper-side-post-knife-blade-master-switch-12v-24v-battery store_origin: PT region: Portugal --- # Rust-resistant solid brass build 200A continuous, 600A momentary power Knife blade quick disconnect Ampper Side Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator for Marine Car Boat RV ATV Vehicles (with Long Bolt) **Brand:** ampper **Price:** € 14.12 **Availability:** ✅ In Stock ## Summary > 🔌 Cut the power, not the adventure—stay charged, stay safe! ## Quick Answers - **What is this?** Ampper Side Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator for Marine Car Boat RV ATV Vehicles (with Long Bolt) by ampper - **How much does it cost?** € 14.12 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/283879953-ampper-side-post-knife-blade-master-switch-12v-24v-battery) ## Best For - ampper enthusiasts ## Why This Product - Trusted ampper brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Control:** Knife blade design lets you cut power instantly with a simple lift—no fuss, no tools. - • **Power with Precision:** Handles up to 200A continuous and 600A momentary current for reliable battery isolation. - • **Universal Compatibility:** Fits GM side post batteries with 3/8" hole—perfect for cars, boats, RVs, and ATVs. - • **Safety Meets Convenience:** Eliminates battery drain during storage and protects your electrical system from unwanted power draw. - • **Built to Brave the Elements:** Solid brass construction resists rust and corrosion, ensuring long-lasting marine-grade durability. ## Overview The Ampper Side Post Knife Blade Master Switch is a heavy-duty 12V/24V battery disconnect isolator designed for GM side post batteries with a 3/8" hole. Featuring a robust solid brass build and a user-friendly knife blade mechanism, it safely cuts power to prevent battery drain and electrical hazards in cars, boats, RVs, and ATVs. Rated for 200A continuous and 600A momentary current, it ensures reliable performance and corrosion resistance for long-term use. ## Description Ampper side post knife blade battery disconnect master switch for Marine Car Boat RV ATV Vehicles Specifications: 1, Compatible with GM side post batteries, battery side post with 3/8" hole only. 1, On/Off 2 position. 2, Voltage: DC 12V-24V, 200A continuous and 600A momentary at DC 12V. 3, Easy to install & simple to use. 4, Knife blade type, lift the knife, then power will cut. 5, Solid brass made, rust and corrosion resistant, durable made for safety use. 6, Can stand alone or be locked together with other switch. 7, Compatible with GM side post batteries or other batteries to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. 8, Used for Car, Vehicle, RV and Boat, also electrical equipment's switch. 9, Package size: 3.9" x 2.75" x 2.75". Complete kits includes: 1 x battery switch 1 x short bolt 1 x long bolt Review: No es el que yo quería,no se puede poner en la batería del coche. Review: High quality and works as intended! Comes already greased. Put it on my 1970 camaro for piece of mind and easy kill for storage. Doesnt look to out of place. Came with bolts too! Recommend using it for anything you have a drain on or something older are worried about electrical fires with. This is a post mount so make sure you have the right battery design first. ## Features - Compatible: with a long bolt, used for side post terminal, battery side post with 3/8" hole only, recommended to mount on NEGATIVE battery post, DC 12V-24V system, 200A continuous and 600A momentary at DC 12V, on/off 2 position. - Convenience: knife blade type, easy to install & simple to use. Lift the knife, then power will cut. - Heavy Duty: solid brass made, rust and corrosion resistant, durable made for safety use. - Purpose: used for battery to isolate and secure the electrical system, eliminate any power draw from the battery when vehicle or boat is not in use, disconnects the battery safely. - Compatible with GM side post batteries or other batteries which have a 3/8" side post terminal, also used for electrical equipment. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07JYDY7FQ | | Brand | Ampper | | Customer Reviews | 4.6 4.6 out of 5 stars (1,994) | | Date First Available | 11 February 2019 | | Exterior | metal | | Item Weight | 241 g | | Lift Type | Off | | Manufacturer | Ampper | | Manufacturer Part Number | Am-CBSKB02 | | Manufacturer reference | Am-CBSKB02 | | Model | Am-CBSKB02 | | Product Dimensions | 7.01 x 9.5 x 7.49 cm; 240.97 g | | Special Features | Used for car battery systems, compatible with GM side post batteries, disconnects the battery safely, eliminate any power draw from the battery when vehicle or boat is not in use, isolate and secure the electrical system | ## Product Details - **Connector type:** Screw - **Contact type:** Normally Open - **Current rating:** 200 Amps - **Operating voltage:** 24 Volts - **Operation mode:** Off ## Images ![Ampper Side Post Knife Blade Master Switch, 12V / 24V Battery Disconnect Switch Isolator for Marine Car Boat RV ATV Vehicles (with Long Bolt) - Image 1](https://m.media-amazon.com/images/I/61ANBOj6EML.jpg) ## Questions & Answers **Q: Will this work on a c5 corvette ?** A: Well, yes but. It's REALLY tight in there, up against the fuse box. Figure on cursing and scraped knuckles. You can't swing a wrench and a socket won't fit in there. I pulled the battery loose, first attached the - cable to the switch, then attached using the long bolt and my fingers. Finished up with a very short wrench from my toolbox. A real pain but the switch seems to work well and makes disconnecting a breeze. **Q: Why does it have to be connected to the negative terminal and not the positive terminal?** A: That's ok, positive or negative can be connected. We recommend to install this cut off switches on the negative, not the positive, because lower current in negative, will be more safety. The switch can be install in the negative/positive wire, another short battery cable or cut existing cable and attach terminals on each end. **Q: Will this fit a duralast gold 101-dlg? cadillac 2007 sts.** A: i bought it for 1977 corvette and it fit I am sure it will fit your sts. **Q: Does this disconnect work on newer model cars** A: 1. you will need about a 3" space next to the negative terminal in order to have room to install this switch. 2. depending on the vehicle you will need clearance for the "knife" to be up in order to close the hood, or it could be installed so it opens to the side if there is enough room there. 3. disconnecting the battery may require radio code for the radio to operate again after removing the power. Other functions may be affected too like the clock, possibly other functions as well 4. you will need the proper tool to tighten the bolt to the battery otherwise it will move about as you operate the switch. I am using this on a full size chevy snow plow yard truck (off road only) with plenty of room and I don't need the clock, that one does not need radio codes after disconnection. Look at the pictures carefully to decide if it will fit on your vehicle, if it fits, it will work. ## Customer Reviews ### ⭐ Review *by J***S on 13 March 2024* No es el que yo quería,no se puede poner en la batería del coche. ### ⭐⭐⭐⭐⭐ Review *by D***N on 11 December 2025* High quality and works as intended! Comes already greased. Put it on my 1970 camaro for piece of mind and easy kill for storage. Doesnt look to out of place. Came with bolts too! Recommend using it for anything you have a drain on or something older are worried about electrical fires with. This is a post mount so make sure you have the right battery design first. ### ⭐⭐⭐⭐⭐ Review *by K***D on 7 September 2024* رائع & رائع & رائع…&اروع….الخ مريح وخاصة لمن يسافر كثير ويحتاج فصل البطاريات وأيضاً لإعادة برمجة الكمبيوتر بعد الصيانة الراحة مع هذا الجهاز اشكر المصمم ## Frequently Bought Together - Side Post Knife Blade Master Switch, Ampper 12V / 24V Battery Disconnect Switch Isolator for Marine Car Boat RV ATV Vehicles (with Long Bolt) - Top Post Knife Blade Master Switch, 12V 24V Battery Disconnect Switch for Auto Car RV-Marine Boat Truck Vehicle, Battery Cut Off Shut Off Switch (Negative,Vertical) - Top Post Negative Battery Disconnect Switch 12V / 24V 250/750 Amps Knife Blade Isolator Power Cutoff Switch for Marine Car Boat RV ATV (Horizontal and Vertical) --- ## 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.pt/products/283879953-ampper-side-post-knife-blade-master-switch-12v-24v-battery](https://www.desertcart.pt/products/283879953-ampper-side-post-knife-blade-master-switch-12v-24v-battery) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-05-17*