--- product_id: 63348047 title: "2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type." brand: "electrotec" price: "73.74 DT" currency: TND in_stock: true reviews_count: 8 category: "Electrotec" url: https://www.desertcart.tn/products/63348047-2-x-electrotec-co03-burglar-alarm-door-contact-sensors-professional store_origin: TN region: Tunisia --- # 20mm operating gap Spec Grade 1 security UK manufactured quality 2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. **Brand:** electrotec **Price:** 73.74 DT **Availability:** ✅ In Stock ## Summary > 🔐 Lock in peace of mind with pro-grade door sensors ## Quick Answers - **What is this?** 2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. by electrotec - **How much does it cost?** 73.74 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/63348047-2-x-electrotec-co03-burglar-alarm-door-contact-sensors-professional) ## Best For - electrotec enthusiasts ## Why This Product - Trusted electrotec brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted & Tested:** Highly rated with 4.6 stars from 586 users—join the secure elite - • **Precision Reed Switch:** 5-terminal design ensures reliable, normally closed circuit detection - • **Durable & Professional:** Specification Grade 1, Environmental Class 2 for long-lasting performance - • **Seamless Compatibility:** Works flawlessly with top brands like Texecom, Gardtec & more - • **Effortless Installation:** Compact 6.7cm size fits discreetly on any door frame ## Overview This pack of 2 Electrotec CO03 burglar alarm door contact sensors features a professional-grade 5-terminal reed switch design, offering a normally closed circuit with an operating gap of approximately 20mm. UK manufactured and compatible with leading security systems like Accenta, Optima, and Texecom, these white sensors deliver reliable, specification Grade 1 security for your home or office. ## Description 2 x burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. Review: Brilliant quality and super easy to fit - Alarm monitoring company had quoted £70-£100 to supply a new sensor. Double pack from desertcart for way way less!! Now that’s value for money. Fitted in just a few mins by watching some YouTube videos. Great! Review: Works Well - These are decent quality, I was getting false alarms due to corroded contacts on the original sensors (they'd been in 20 years). These went in easily and are now doing the job without fault. ## Features - Authentic products carry our branding. - Normally closed door contacts (when door is closed circuit is closed). - Compatible with Accenta, Optima, ADE, Gardtec, Texecom, Scantronic and many more. - Specification Grade 1, Environmental Class 2, Operating gap approx 20mm. - UK Manufactured. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B078WJBH87 | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 232,150 in DIY & Tools ( See Top 100 in DIY & Tools ) 189 in Home Security Door & Window Sensors | | Colour | White | | Customer Reviews | 4.6 4.6 out of 5 stars (586) | | Date First Available | 9 Jan. 2018 | | Guaranteed software updates until | unknown | | Item Package Quantity | 2 | | Item Weight | 64 g | | Manufacturer | Other | | Manufacturer reference | CO03 | | Part Number | CO03 | | Product Dimensions | 6.7 x 1.2 x 2.8 cm; 64 g | ## Images ![2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. - Image 1](https://m.media-amazon.com/images/I/61CZS1fsBFL.jpg) ## Questions & Answers **Q: Are these wireless?** A: No sorry these are designed for wired systems only. It should be in the description "for connection to a number of different makes and models of alarm panels". I think any wireless contacts may the word wireless in the title. **Q: what type of wiring is used with this product** A: These contacts are designed to be connected to a burglar alarm control panel, examples of these are listed in the bullet points. You would normally use a minimum of 4 core alarm cable, never telephone cable as I have seen some do. Two of the wires in the cable are connected to two terminals of a normally closed alarm zone in the control panel. The other two wires can be connected to the tamper circuit if it's going to be included. There is no set colour code for the wiring each alarm engineer normally uses their own. At the contact end the two alarm zone wires are connected to the two silver screw terminals. The two tamper circuit wires, if used are twisted together and connected to any of the spare brass coloured terminal screws. As an experienced alarm engineer, I would like to point out, when connecting to the silvers your wire should go between the screw head and the washer, never under the washer as stated by someone previously. If you put wires under the washer it could snag on the small reed switch wire causing the contact to fail. Hopefully that answers your questions comprehensively and possibly gives a little clarity to the correct installation. **Q: Hello, sorry if this is a basic question but i have two door to wire up. Does anyone have a diagram? There seems to be 5 terminal points....** A: Hello here we go. Fitting reed switch to door frame and magnet to door. Your cable from alarm unit use 4 of the cores. White & Blue Green & Yellow. Looking at the switch you only need to wire 3 of the 5 screws. The 2 silver screws you will see the reed switch is connected to wire the blue and white to each of these. The centre screw connect the green and yellow together on this screw. This is your tamper loop. Ignore the 2 outer screws. Note wrap well the wires around each screw in a clockwise direction under the washers. Now in the alarm unit wire the main entry door to zone 1. Blue and white from your switch. Do same for door 2 and wire to zone 2 or a free zone position. Now connect the green wires from each door to the tamper connection. If a link is in remove it. And connect the yellow wires together simply twist together and wrap with insulating tape. This gives you a tamper proof loop if any of the wires are cut the tamper alarm will sound. Job done hope this helps. **Q: Does the magnetic contact work with the accenta 8 g4 alarm** A: Yes they do, along with most alarm panels. I'm sure it mentions this in the listing description but if you're viewing on a mobile, it's not always easy to find. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Brilliant quality and super easy to fit *by A***R on 25 February 2021* Alarm monitoring company had quoted £70-£100 to supply a new sensor. Double pack from Amazon for way way less!! Now that’s value for money. Fitted in just a few mins by watching some YouTube videos. Great! ### ⭐⭐⭐⭐⭐ Works Well *by B***B on 30 January 2020* These are decent quality, I was getting false alarms due to corroded contacts on the original sensors (they'd been in 20 years). These went in easily and are now doing the job without fault. ### ⭐⭐⭐⭐ Contacted seller *by G***S on 1 April 2020* Initial purchase faulty, contacted seller and immediately sent out replacements, great value for money ## Frequently Bought Together - 2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. - Texecom Veritas R8 Burglar Alarm Control Panel - WA7 - ELMDENE TS443-16 16 OHM BURGLAR SECURITY ALARM EXTENSION SPEAKER SOUNDER --- ## 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.tn/products/63348047-2-x-electrotec-co03-burglar-alarm-door-contact-sensors-professional](https://www.desertcart.tn/products/63348047-2-x-electrotec-co03-burglar-alarm-door-contact-sensors-professional) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-10-29*