--- 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: "Β₯24700" currency: JPY in_stock: true reviews_count: 8 category: "System Sensor" url: https://www.desertcart.jp/products/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector store_origin: JP region: Japan --- # Photoelectric smoke detection 135Β°F fixed thermal sensor Red LED visual alert System Sensor 4WT-B 4-wire, photoelectric i3 smoke detector with a 135 Degree fixed thermal sensor **Brand:** system sensor **Price:** Β₯24700 **Availability:** βœ… In Stock ## Summary > 🚨 Stay ahead of danger with smart, seamless smoke 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?** Β₯24700 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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 - β€’ **Visual Alert System:** Bright red LED ensures immediate, unmistakable notification - β€’ **Precision Thermal Sensing:** Detects heat spikes up to 135Β°F for early fire warning - β€’ **Seamless 4-Wire Integration:** Reliable 12/24 VDC power with easy retrofit installation - β€’ **Built-In Maintenance Signaling:** Remote monitoring ready with drift compensation for long-term accuracy - β€’ **Advanced Photoelectric Detection:** Minimizes false alarms while maximizing smoke sensitivity ## Overview The System Sensor 4WT-B is a US-made, 4-wire photoelectric smoke detector featuring a 135Β°F fixed thermal sensor and a bright red LED visual alert. Designed for professional-grade fire safety, it offers reliable 12/24 VDC power, built-in remote maintenance signaling, and advanced algorithms to reduce false alarms. Compact and easy to retrofit, it’s a trusted choice for modern safety systems. ## Description Smoke Alarm, Detection Method Photoelectric, No Interconnection Capability, Power Source 12/24 VDC, Four-Wire, Visual Alert Red LED, Diameter 5-19/64 In., Height 2 In., Digital Readout No, Battery Backup No, Features Removable Detector Cover and Chamber, Built-In Remote Maintenance Signaling, Drift Compensation and Smoothing Algorithms, Thermal Sensor, Hush Button No, Locking Pin No, Operating Temp. 32 Degrees to 120 Degrees F, Standards UL, CSFM, Includes Base Review: Perfect swap- No issues - Exact replacement for my unit. Left original base plate and added new sensor. Alarm system recognized and all is working. Review: Installation of System Sensor 4 WT-B - Perfect replacement for System Sensor model # 2112/24TS 4-wire PhotoElectronic smoke detector. Easily removed old unit and rewired the new unit by connecting red wire to + in terminal, single black wire to - in/out terminal, two black wires to no terminal and green and white wires to com terminal. Tested the newly installed unit by inserting allen wrench into recessed test switch and applied heat from a hair dryer. Both test sounded the alarm. Unit is correctly wired and installed when the green LED light is blinking. ## Features - Smoke Alarm - Country of manufacture: United States ## 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) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Perfect swap- No issues *by B***Y on June 26, 2025* Exact replacement for my unit. Left original base plate and added new sensor. Alarm system recognized and all is working. ### ⭐⭐⭐⭐⭐ Installation of System Sensor 4 WT-B *by A***R on August 11, 2025* Perfect replacement for System Sensor model # 2112/24TS 4-wire PhotoElectronic smoke detector. Easily removed old unit and rewired the new unit by connecting red wire to + in terminal, single black wire to - in/out terminal, two black wires to no terminal and green and white wires to com terminal. Tested the newly installed unit by inserting allen wrench into recessed test switch and applied heat from a hair dryer. Both test sounded the alarm. Unit is correctly wired and installed when the green LED light is blinking. ### ⭐⭐⭐⭐⭐ Great replacement for a 4 wire smoke detector *by M***E on November 4, 2025* Replaced an older 4 wire smoke detector that had yellowed over time. Works perfectly and has the added capability of fixed rate heat detection. --- ## 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.jp/products/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector](https://www.desertcart.jp/products/8984151-system-sensor-4wt-b-4-wire-photoelectric-i3-smoke-detector) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-06*