---
product_id: 8984151
title: "System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor"
brand: "system sensor"
price: "€ 108.32"
currency: EUR
in_stock: true
url: https://www.desertcart.pt/products/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector
store_origin: PT
region: Portugal
---

# Photoelectric i3 smoke detection tech 4-wire connectivity for reliable power 135° fixed thermal sensor System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor

**Brand:** system sensor
**Price:** € 108.32
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay ahead of danger with smart, precise fire detection!

## Quick Answers

- **What is this?** System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor by system sensor
- **How much does it cost?** € 108.32 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/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector)

## Best For

- system sensor enthusiasts

## Why This Product

- Trusted system sensor brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Made in the USA:** Crafted with trusted quality and compliance standards
- • **Robust 4-Wire Design:** Ensures stable power and seamless integration with fire systems
- • **Essential Safety Upgrade:** Elevate your workspace or home with cutting-edge fire detection
- • **Precision Thermal Sensing:** Detects heat spikes at a sharp 135° angle for early fire alerts
- • **Advanced Photoelectric Detection:** i3 sensor technology spots smoke particles faster and more accurately

## Overview

The 4WT-B is a US-made, 4-wire photoelectric smoke detector featuring advanced i3 sensor technology and a 135° fixed thermal sensor, designed to provide rapid and reliable fire detection for enhanced safety in residential or commercial environments.

## Description

4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor

## Features

- Smoke Alarm
- Country of manufacture: United States

## Product Details

- **Brand:** System Sensor
- **Style:** Smoke Detector
- **Power Source:** Corded Electric
- **Color:** White
- **Product Dimensions:** 2.4"D x 5.7"W x 5.7"H
- **Item Weight:** 8.16 ounces
- **Alarm:** Visual
- **Upper Temperature Rating:** 135 Degrees Fahrenheit
- **Sensor Type:** Photoelectric
- **Number of Items:** 1

## Images

![System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor - Image 1](https://m.media-amazon.com/images/I/41TZQsLVDtL.jpg)

## Questions & Answers

**Q: Es necesario colocar una base? el sistema estará conectado al sistema de alarmas**
A: Hello,
Please submit your question in English.

**Q: Is this the update to replace model 2412?**
A: i never used 2412 unit but 4wt-b-4 should work as a replacement it is 12vdc & 2 wires to trigger alarm

**Q: I have an old unit that needs replacing. There is a 4 wire phone cord like coming out of the cieling....red/black/green and yellow, Will this work?**
A: Check the website for System Sensor to check the replacement for the original unit.

**Q: Will this mount onto a standard round ceiling box?  saw a review/complaint about detector having no base.  i'm just replacing a bad esl smoke detector**
A: It comes with new round plastic base plates in the box, but I just used the old ones that were already installed.  So I just twist-locked the new sensor into the old plastic base plate.  If the light does not come up green after installing, try resetting your whole system.  My alarm contractor had to install a resistor or something to get all the sensors to switch to green.

## Frequently Bought Together

- System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor
- IS335 WIRED PIR Motion Detector, 40' x 56' by Honeywell
- Honeywell Security 6160 Ademco Alpha Display Keypad

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**Shop now:** [https://www.desertcart.pt/products/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector](https://www.desertcart.pt/products/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-01-28*