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      • Air Products and Controls
      • Apollo
      • Autronica
      • Bosch
      • DSC
      • E2S by The Signal Source
      • Eaton Wheelock
      • Edwards
      • Federal Signal by The Signal Source
      • Fire-Lite
      • Fireray
      • Gamewell-FCI
      • Genesis
      • Gentex
      • Hochiki
      • HyperSpike
      • Johnson Controls
      • Mircom
      • Napco
      • Notifier
      • Potter
      • Protectowire
      • Safe Signal
      • Secutron
      • Siemens
      • Silent Knight
      • Simplex
      • Space Age
      • System Sensor
      • Viking
    • Gas & Flame Detection
      • Det-Tronics
      • Detector Testers
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      • Li-Ion Tamer
      • Macurco
      • Spectrex
    • Fire Suppression
      • Fire Sentry
      • Kidde
      • Kidde Fenwal
      • Monaco
      • Amerex
      • ANSUL
      • BlazeMaster
    • Aspirating Detection
      • Modulaser
      • VESDA
    • HVAC & Controls
      • BRK Electronics
      • First Alert
      • Honeywell Home
      • Resideo
      • Thermotech
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      • Aiphone
      • Comba
      • Fiplex by Honeywell
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      • Talkaphone
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      • Universal
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      • ADRF
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      • Altronix
      • Casil Batteries
      • Power Sonic
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      • Yuasa
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      • STI
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      • Duct Detectors
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      • Linear Heat Detection
      • Sampling Points
      • Beam Detectors
      • Multi Criteria Detectors
      • Carbon Monoxide Detectors
      • Smoke & Carbon Monoxide Detectors
      • Sensors
      • Sampling Tubes
      • Aspirating Gas Detectors
    • Notification
      • Strobes
      • Horn Strobes
      • Speakers
      • Speaker Strobes
      • Sounders
      • Horns
      • Sounder Bases
      • Bells
      • Sounder Strobes
      • Chimes
      • Voice Systems
      • Beacons
      • Amplifiers
      • Audio Units
      • Clocks
    • Initiating Devices
      • Pull Stations
      • Call Points
      • Door Holders
      • Waterflow Detectors
    • Control & Modules
      • Modules
      • Annunciators
      • Control Panels
      • Relays
      • Isolator Modules
      • Boards
      • Monitor Modules
      • Relay Modules
      • Media Card
      • Software & Licenses
      • Expander Modules
      • Access Control Units
      • Chassis
    • Power
      • Power Supplies
      • Batteries
      • Transformers
      • Surge Protection Devices
      • Fuses
      • EOL Resistors
      • Battery Cabinets
      • NAC
    • Enclosures & Mounting
      • Accessories
      • Covers
      • Enclosures
      • Backboxes
      • Brackets
      • Bases
      • Stoppers
      • Gaskets
      • Harness
      • Mounting Plates
      • Cables
      • Trim Plates
      • Trim Rings
      • Surface Boxes
      • Bezel Kits
      • Cabinets
      • Wire Guards
      • Lens
    • Fire Suppression
      • Suppression Cylinders
      • Suppression Hoses
      • Suppression Valves
      • Fire Extinguishers
      • Cylinder Framing Kits
      • Suppression Components
      • Discharge Nozzles
      • Cylinder Valve Assemblies
      • Discharge Tubes
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      • Zone Valve Motors
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i3 Series

System Sensor 2W-B i3 2-wire photoelectric smoke detector

2-Wire vs 4-Wire Smoke Detectors: Which System Sensor i3 Model?

2-WireThe Fire Alarm SupplierOct 04, 2026

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The Fire Alarm Supplier stocks over 20,000 parts from more than 100 manufacturers, across fire alarm and detection, gas and flame detection, fire suppression, HVAC and hydronics, and in-building communications.

We supply contractors, system integrators, facility managers, government agencies, educational institutions and healthcare organisations with genuine manufacturer parts.

Much of what we carry is no longer easy to find. Alongside current production, we stock legacy and discontinued parts for systems already installed, the panel board, the sounder base or the valve assembly that keeps an existing installation running rather than forcing a replacement.

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