---
product_id: 63348047
title: "2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type."
brand: "electrotec"
price: "KSh5900"
currency: KES
in_stock: true
reviews_count: 8
category: "Electrotec"
url: https://www.desertcart.co.ke/products/63348047-2-x-electrotec-co03-burglar-alarm-door-contact-sensors-professional
store_origin: KE
region: Kenya
---

# 20mm operating gap precision Grade 1 security standard UK manufactured quality 2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type.

**Brand:** electrotec
**Price:** KSh5900
**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?** KSh5900 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.ke](https://www.desertcart.co.ke/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

- • **Durable Build:** Robust 5-terminal reed switch design for long-lasting performance
- • **Precision Sensing:** Operates with a 20mm gap for accurate door status detection
- • **Authentic & Trusted:** Genuine branded sensors, proudly UK manufactured
- • **Seamless Compatibility:** Works flawlessly with top brands like Texecom, Gardtec & more
- • **Professional Grade Security:** Specification Grade 1 ensures industry-leading reliability

## Overview

This pack of 2 Electrotec CO03 burglar alarm door contact sensors features professional-grade, normally closed 5-terminal reed switches. Engineered to Specification Grade 1 and Environmental Class 2 standards, they offer precise 20mm operating gap detection. Compatible with major security brands and proudly UK manufactured, these white sensors deliver reliable, high-quality security for your home or business.

## Description

2 x burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type.

Review: replacement switches for existing alarm system - nothing lasts forever. Our alarm became faulty and I traced it back to faulty door and window switches. (after 26 years can't complain) easy to fit replacements but? check switch function "before" fitting. I had 2 new ones that didn't work properly. the very tiny switch failed to respond to the magnet. As they were cheap enough I just ordered some more. Job done
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!

## 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 |
|---------------|-------|
| Manufacturer | Other |
| Part Number | CO03 |
| Product Dimensions | 6.7 x 1.2 x 2.8 cm; 64 g |
| Manufacturer reference | CO03 |
| Colour | White |
| Item Package Quantity | 2 |
| Batteries included? | No |
| Batteries Required? | No |
| Item Weight | 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)
![2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. - Image 2](https://m.media-amazon.com/images/I/61iyzNUYJbL.jpg)
![2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type. - Image 3](https://m.media-amazon.com/images/I/61vbdlpO9YL.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

### ⭐⭐⭐⭐⭐ replacement switches for existing alarm system
*by E***. on 26 December 2024*

nothing lasts forever. Our alarm became faulty and I traced it back to faulty door and window switches. (after 26 years can't complain) easy to fit replacements but? check switch function "before" fitting. I had 2 new ones that didn't work properly. the very tiny switch failed to respond to the magnet. As they were cheap enough I just ordered some more. Job done

### ⭐⭐⭐⭐⭐ 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!

### ⭐⭐⭐⭐ Good product
*by J***F on 6 April 2019*

Arrived quickly & did the job required

## Frequently Bought Together

- 2 x Electrotec CO03 burglar alarm door contact sensors, professional quality, white 5 terminal reed switch type.
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*Product available on Desertcart Kenya*
*Store origin: KE*
*Last updated: 2026-02-26*