System Sensor Photoelectric i3 Series Smoke Detector 4WTAR-B, 4-Wire, Thermal Sensor, Built-In Sounder, Form Relay, White
Sense the smoke. Sound the alarm.
A 4-wire photoelectric smoke detector with an isolated thermal sensor, a built-in 85 dB sounder and a Form C relay. It is a plug-in head, and the base is included.

Detecting smoke is only half the job.
In offices, schools, hotels and apartments, a detector also has to warn people nearby and show maintenance crews its status. This one has a sounder and status LEDs built in.
Built for faster installs
The i3 design focuses on installation ease and quick local inspection.
Plug-in head and base
The detector plugs into the included base, and the Stop-Drop 'N Lock attachment secures it there.

Built-in sounder
The sounder is part of the detector head.
Red and green LEDs
The LEDs show status during power-up, standby, alarm, maintenance and freeze trouble conditions.
Form C relay
A Form C relay sits alongside the built-in sounder and in-line terminals.
Removable cover and chamber
The cover and chamber come off, and remote maintenance signaling is supported.
Everything you need to know.
| Brand | System Sensor |
| Model | 4WTAR-B |
| Series | i3 |
| Sensing Technology | Photoelectric |
| Input Voltage | 24V DC |
| Form Factor | Ceiling Mount |
| Diameter | 5.30" |
| Height | 2.00" |
| Color | White |
| UL Listed | Yes |
System Sensor Photoelectric i3 Series Smoke Detector 4WTAR-B, 4-Wire, Thermal Sensor, B...
The System Sensor 4WTAR-B is a smoke detection product: Photoelectric i3 Series Smoke Detector (4-Wire, Thermal Sensor, Built-In Sounder, Form Relay, White). It is intended for fire alarm installers, integrators and facility maintenance teams who need a genuine System Sensor part for new installs, expansions or replacements.
Key Features
- Red and green LEDs to simplify local status indication during power-up, standby, alarm, maintenance, and freeze trouble conditions
- Installer-friendly base and plug-in design
- Form C relay
- Plug-in design (base included)
- In-line terminals
- Flexible mounting options
- Stop-Drop ’N Lock™ attachment to the base
- Removable cover and chamber
- Remote maintenance signaling
- Drift compensation and smoothing algorithms
Specifications
- Brand: System Sensor
- Model: 4WTAR-B
- Product Model: 4WTAR-B
- Product Series: i3
- Product Type: Smoke Detector
- Connectivity Technology: Wired
- Detectable Medium: Fire
- Sensing Technology: Photoelectric
- Sensor Type: Photoelectric
- Status Indicators: Alarm, LED
- Color: White
- Form Factor: Ceiling Mount
- Height: 2"
- Weight (Approximate): 7.10 oz
- Input Voltage: 24V DC
- Input Voltage (V DC): 24
- Diameter: 5.3"
- Limited Warranty: 3 year
- Certifications & Standards: UL ; FM ; MEA ; MSFM ; ETL
- Package Contents: i3 4WTAR-B Smoke Detector ; Base
- Shipping weight: 0.66 lb
Typical Uses
- Smoke detection on conventional and addressable fire alarm systems
- Offices, schools, hotels, apartments and other commercial buildings
Fire alarm devices must be installed and tested by qualified personnel in line with NFPA 72, local codes and the manufacturer's installation instructions. Please confirm that the 4WTAR-B is compatible with your fire alarm control panel, wiring, voltage, mounting and finish before ordering. Contact us with the models of your existing devices if you need help checking compatibility.
Need help with compatibility?
Looking for a manufacturer part number, compatible replacement, or quantity order? Contact Raztechs for sourcing and quote support.

System Sensor 4WTAR-B, ready to order.
- i3 4WTAR-B Smoke Detector
- Base
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