System Sensor 4-Wire Photoelectric Smoke Detector

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The 4WT-B is a 4-wire, photoelectric i3 smoke detector with a 135deg.F fixed thermal sensor.
Brand: System Sensor
Part Number: 4WT-B

Availability: In stock




System Sensor i3 series smoke detectors represent significant advancement in conventional detection. The i3 family is founded on three principles: installation ease, intelligence, and instant inspection.

Installation ease. The i3 line redefines installation ease with its plug-in design. This allows an installer to pre-wire bases (included with heads). The large wire entry port and in-line terminals provide ample room for neatly routing the wiring inside the base. The base accommodates a variety of back box mounting methods as well as direct mounting with drywall anchors. To complete the installation, i3 heads plug into the base with a simple Stop-Drop 'N Lock action.

Intelligence. i3 detectors offer a number of intelligent features to simplify testing and maintenance. Drift compensation and smoothing algorithms are standard with the i3 line to minimize nuisance alarms. 2-wire i3 detectors can generate a remote LEDindicated maintenance signal when connected to the 2W-MOD2 loop test/maintenance module or a panel equipped with the i3 protocol. The SENS-RDR, a wireless device, displays the sensitivityof i3 detectors in terms of percent-per-foot obscuration.

Instant inspection. The i3 series provides wide-angle red and green LED indicators for instant inspection of the detector's condition: normal standby, out-of-sensitivity, alarm, or freeze trouble. When connected to the 2W-MOD2 loop test/maintenance module or a panel with the i3 protocol, the EZ Walk loop test feature is available on 2-wire i3 detectors. This feature verifies the initiating loop wiring by providing LED status indication at each detector.


  • 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
  • Loop testing via EZ Walk feature
  • Built-in test switch

Additional Info

Additional Info

Part Number 4WT-B
What's in the box (1) System Sensor 4-Wire Photoelectric Smoke Detector
Variant N/A


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Detection Photoelectric
Wiring 4-wire
Heat Sensor 135°F (57.2°C) fixed
Operating Voltage 12/24 V non-polarized nominal, 8.5 min. to 35 max.
Maximum Ripple Voltage 30% of nominal (peak to peak)
Alarm Current 20mA max. @ 12V, 23mA @ 24V
Standby Current 50 µA max. avg.
Alarm Contact Ratings 0.5 A @ 30V AC/DC
Temperature Range 32° to 100°F (0° to 37.8°C)
Humidity Range 0% to 95% RH, noncondensing
Freeze Trouble 41°F (5°C)
Sensitivity 2.5%/ft. nominal
Wiring Gauge 14-22 AWG
Dimensions 2.0" (51mm) H x 5.3" (127mm) Dia.
Weight 6.3 oz. (178 g)