2WTA-B by System Sensor Smoke,Thermal, Sounder & Relay

i³™ Series Smoke Detector with Isolated Thermal Sensor, Sounder, Relay

i³™ Series smoke detectors with isolated thermal sensors, sounders, and relays apply the guiding principles of installation ease, intelligence, and instant inspection.

Throughout the i³ Series, installation is simple with its installer-friendly base and plug-in design. The base accommodates a broad range of back box and direct mounting options and provides ample space for pre-wiring the device. To complete the installation, the i³ detectors plug into its base with a simple Stop-Drop ’N Lock action.
To reduce the likelihood of nuisance alarms, all i³ detectors are equipped with both drift compensation and smoothing algorithms. These capabilities minimize both short- and long-term causes of nuisance alarms, such as RF interference and dust accumulation.


When connected to the 2W-MOD2 loop test/maintenance module or an i3 Ready™ panel, 2‑wire i3 detectors can generate a remote maintenance signal when in a maintenance or freeze trouble condition. To measure the sensitivity of any i³ detector, the SENS-RDR displays the reading, in terms of percent-per-foot obscuration, within seconds.

i³ detectors have red and green LEDs to simplify local status indication during power-up, standby, alarm, maintenance, and freeze trouble conditions. If connected to the RRS-MOD reversing relay/synchronization module, all i³ sounders on the loop will activate when one detector is in alarm. The RRS-MOD also synchronizes i³ sounder output to ensure a clear audible signal.

Should the application call for differentiating between a local and a general alarm, the isolated thermal model initiates a local alarm when smoke is detected and a general alarm when the thermal sensor is activated.Features & Benefits:

  • 85 dB sounder
  • Form C relay
  • Isolated thermal sensor
  • 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
  • Simplified sensitivity measurement
  • Dual-color LEDs


  • UL Listed S911
  • FM Approved 3015195
  • CSFM Listing 7272-1653:164
  • MEA Approved 372-02-E
  • MSFM Approved 2133
  • ETL Listed 3180932
  • C2WTA-BA: ULC Listed
  • C2WTR-BA: ULC Listed
  • C4WT-BA: ULC Listed
  • C4WTA-BA: ULC Listed
  • C4WTR-BA: ULC Listed
  • C4WTAR-BA: ULC Listed
  • C4WITAR-BA: ULC Listed
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2WTA-B by System Sensor Smoke,Thermal, Sounder & Relay
2WTA-B by System Sensor Smoke,Thermal, Sounder & Relay