System Sensor 4WTA-B i3 Series Smoke Detector

  • Sale
  • $68.28
  • Regular price $118.97


4WT-B Photoelectric Smoke Detectors.

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.
  • 2 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.



Operating Voltage: 12/24 VDC non-polorized Minimum: 8.5 V Minimum: 35 V
Standby Current: 2-wire: 50 ?A maximum average; 4-wire: 50 ?A maximum average
Maximum Ripple Voltage: 30% peak to peak of applied voltage
Maximum Alarm Current 2-wire: 130 mA limited by control panel; 4-wire: 20 mA @12 V, 23 mA @ 24 V
Operating Temperature Range: 2W-B and 4W-B: 32°F to 120°F (0°C to 49°C); 2WT-B and 4WT-B: 32°F to 100°F (0°C to 37.8°C)
Operating Humidity Range: 0 to 95% RH non-condensi
Thermal Sensor: 135°F (57.2°C) fixed
Sensitivity: 2.5%/ft nominal
Input Terminals: 14 to 22 AWG
Dimensions (including base): 5.3 inches (127 mm) diameter; 2.0 inches (51 mm) height
Weight: 6.3 oz. (178 grams)
Mounting: 3.5-inch (8.8 cm) octagonal backbox 4-inch (10.16 cm) octagonal backbox. Single-gang back box 4-inch (10.16 cm) square backbox with plaster ring. Direct mount to ceiling.)