--- product_id: 503239604 title: "Toroid Core FT240-43 Ferrite" brand: "fair-rite" price: "€ 37.12" currency: EUR in_stock: true reviews_count: 8 category: "Fair Rite" url: https://www.desertcart.be/products/503239604-toroid-core-ft240-43-ferrite store_origin: BE region: Belgium --- # Power Transformers 0.5-30 MHz Wideband 5-400 MHz RFI Suppression 5-500 MHz Toroid Core FT240-43 Ferrite **Brand:** fair-rite **Price:** € 37.12 **Availability:** βœ… In Stock ## Summary > πŸ”§ Elevate your circuits with the FT240-43 – where precision meets power! ## Quick Answers - **What is this?** Toroid Core FT240-43 Ferrite by fair-rite - **How much does it cost?** € 37.12 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/503239604-toroid-core-ft240-43-ferrite) ## Best For - fair-rite enthusiasts ## Why This Product - Trusted fair-rite brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Compact & Durable Design:** 2.4-inch OD with robust ferrite material for reliable builds - β€’ **Effective Noise Reduction:** RFI suppression across 5 to 500 MHz keeps signals clean - β€’ **Trusted Industry Standard:** Fair-Rite brand with 4.6-star rating and top 32 rank in ferrite cores - β€’ **Versatile Frequency Range:** Supports wideband transformers from 5 to 400 MHz - β€’ **Precision Magnetic Performance:** AL=1075 Β±20% for consistent inductance ## Overview The Toroid Core FT240-43 Ferrite by Fair-Rite delivers precise inductance with an AL value of 1075 Β±20%, optimized for wideband transformers (5-400 MHz), power transformers (0.5-30 MHz), and RFI suppression (5-500 MHz). Its compact 2.4-inch outer diameter and trusted brand reputation make it a top choice for professional-grade electronic designs. ## Description One FT240-43 Toroid Ferrite Core Fair-Rite Bran,d AL=1075 plus or minus 20 percent, uH=(AL x Turns squared)/1000 Wideband, Transformers 5 - 400 MHz, Power Transformers 0.5 - 30 MHz, RFI Suppression 5 - 500 MHz, OD = 2.40 inch / 61.0 mm plus or minus 1.30 mm, ID = 1.40 inch / 35.55 mm plus or minus 0.85 mm, Ht = 0.50 inch / 12.7 mm plus or minus 0.50 mm From bulk packaging, not in retail packaging Review: Ferrite Rings review. - Excellent genuine FT240-43 Ferrite Cores, good fast delivery as well,recommended purchase. Review: ferrite Core - Just the job ## Features - FT240-43 - Ferrite ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0178IA3XU | | Best Sellers Rank | 32,824 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 32 in Ferrite Cores | | Brand | FAIR-RITE | | Customer Reviews | 4.6 4.6 out of 5 stars (421) | | Date First Available | 27 Oct. 2015 | | Item Weight | 118 g | | Item model number | FT240-43 | | Manufacturer | FAIR-RITE | | Manufacturer part number | FT240-43 | | Product Dimensions | 7.62 x 2.54 x 7.62 cm; 118 g | ## Images ![Toroid Core FT240-43 Ferrite - Image 1](https://m.media-amazon.com/images/I/51O2dNGYN+L.jpg) ## Questions & Answers **Q: What is the max wattage these are rated for. i want to build an unun for an end fed antenna that will handle 600 watts. will 1 or more handle amount?** A: You should use 2 for 600 watts, the highest rating I have seen for only one is 400 watts. Based on commercial models of end-fed ununs. **Q: I would like to use this on the 11-meters cb band (26.965 - 27.405) will this help to cut down rf returning to the radio?** A: how many watts? 4 watts isn’t anything to worry about but 500+ watts certainly would be. and yes, wound as a 1:1 choke (or they also call them current baluns) it will absolutely lessen common mode current coming back down the coax. coax coils (mentioned in other responses) are not nearly as effective as a 240-31 ferrite core wrapped as a 1:1 current choke. google β€œ1:1 current balun” or β€œ1:1 current choke” and you will see many examples to guide you. balun btw simply means balanced and unbalanced and they are used to rectify the impedance mis-match between the antenna and the 50 ohm coaxial cable. that generally involves lowering the high impedance of an antenna (200-3000 ohms depending on design) and even then, it should be referred to as a step down transformer but balun (balanced / unbalanced) has become the default term. **Q: Will this work to reduce/remove static noise on a regular FM radio produced from cheap led lighting in a garage?** A: It likely would with a couple of ifs. It is really large for such a task. The toroidal core would need to be placed as close to the LED power source as possible. Is the FM radio itself close to the LED lighting? **Q: Will this block interference from a treadmill motor? Ethernet over powerline is degraded whenever the treadmill is on.** A: ethernet over power line is destroying the shortwave radio frequencies , you should run a real cat-5/6 cable or use 5gig wireless.... and you would only need type 73 core for anything the treadmill is hashing out on the airwaves. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Ferrite Rings review. *by G***. on 7 February 2026* Excellent genuine FT240-43 Ferrite Cores, good fast delivery as well,recommended purchase. ### ⭐⭐⭐⭐⭐ ferrite Core *by J***. on 30 September 2025* Just the job ### ⭐⭐⭐⭐⭐ Good price and performance *by M***E on 10 April 2025* Nicely rounded edges make for a great starting point. I used two of these to make RF chokes with Ultraflex 7. Took 8 turns easily. ## Frequently Bought Together - Toroid Core FT240-43 Ferrite - Toroid Core FT240-31 Ferrite - FT-140-43 Ferrite Toroid Core | 43 Material --- ## 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/503239604-toroid-core-ft240-43-ferrite](https://www.desertcart.be/products/503239604-toroid-core-ft240-43-ferrite) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-05-02*