System Sensor Photoelectric i3 Series Smoke Detector 4W-B, 4-Wire, White
Smoke detection, built to install fast.
A 4-wire photoelectric smoke detector from the System Sensor i3 series. The plug-in detector line and included mounting base make new installs and replacements simpler.

Fire detection is only as good as its install.
Detectors that are awkward to wire, mount and service slow down every job. The i3 series is built around installation ease, intelligence and instant inspection.
Built for installers and maintenance
The i3 4W-B packs mounting, wiring and maintenance details into one detector.
Flexible mounting
Mounts to octagonal and single-gang back boxes, 4-square back boxes, or direct to ceiling.

wire connection
A four-wire photoelectric smoke detector with 130 mA max.
Easier wiring
A large wire entry port and in-line terminals with SEMS screws are built into the base.
Quick base attachment
The Stop-Drop 'N Lock attachment secures the detector to its base, and the cover and chamber are removable.
Built-in maintenance aids
Remote maintenance signaling, drift compensation and smoothing algorithms, simplified sensitivity measurement and wide-angle, dual-color LED indication.
Everything you need to know.
| Brand | System Sensor |
| Model | 4W-B |
| Sensing Technology | Photoelectric |
| Detectable Medium | Fire |
| Connectivity | Wired, 4-wire |
| Input Voltage | 12V DC |
| Mount Type | Ceiling Mount |
| Diameter | 5.0" |
| Height | 2.0" |
| Certifications | UL 268, UL Listed |
| Color | White |
| Country of Origin | MX |
System Sensor Photoelectric i3 Series Smoke Detector 4W-B, 4-Wire, White
The System Sensor 4W-B is a smoke detection product: Photoelectric i3 Series Smoke Detector (4-Wire, 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
- Plug-in detector line, mounting base included
- Large wire entry port
- In-line terminals with SEMS screws
- Mounts to octagonal and single-gang back boxes, 4-square back boxes, or direct to ceiling
- Stop-Drop ’N Lock attachment to base
- Removable detector cover and chamber
- Built-in remote maintenance signaling
- Drift compensation and smoothing algorithms
- Simplified sensitivity measurement
- Wide-angle, dual-color LED indication
Specifications
- Brand: System Sensor
- Model: 4W-B
- Product Model: 4W-B
- Product Series: i3
- Product Type: Smoke Detector
- Connectivity Technology: Wired
- Detectable Medium: Fire
- Sensing Technology: Photoelectric
- Status Indicators: LED, Switch
- Color: White
- Form Factor: Ceiling Mount
- Height: 2"
- Weight (Approximate): 6.30 oz
- Input Voltage: 12V DC, 24V DC
- Input Voltage (V DC): 12, 24
- Diameter: 5"
- Package Contents: i3 4W-B Smoke Detector ; Plug-in Detector Line ; Mounting Base
- Shipping weight: 0.52 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 4W-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 4W-B, ready to order.
- i3 4W-B Smoke Detector
- Plug-in Detector Line
- Mounting Base
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