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Due to Component and Supply Shortages World Wide Due to Component and Supply Shortages World Wide
System Sensor 4WTR-B, 4-wire P/E Smoke Detector w/Thermal and Form C Relay.
System Sensor 4WTR-B, 4-wire P/E Smoke Detector w/Thermal and Form C Relay.

System Sensor 4WTR-B, 4-wire P/E Smoke Detector w/Thermal and Form C Relay.

Manufacturer:System Sensor
Manufacturer Part#:4WTR-B
Our Part#:4WTR-B
Stock Status: Call for Availability
Retail Price:$151.46
Your Savings:$53.01(35%)
Your Price:$98.45


System Sensor







Feature 5


Feature 7

Product Type:Combination Detector|Input Voltage:24VDC|Detection Type:Photoelectric + Heat|Connection Type:System|Intended Use:Commercial/Industrial|Battery Backup:No|Interconnect:No|System Type:Conventional


  • 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


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 detector plugs 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 has red and green LEDs to simplify local status indication during power-up, standby, alarm, maintenance, and freeze trouble conditions. When in alarm, i3 sounder models generate an 85 dB temporal tone. 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 i3 line offers an isolated thermal model, which initiates a local alarm when smoke is detected, and a general alarm when the thermal sensor is activated.


Detection: Photoelectric
Wiring: 4-wire
Heat Sensor: 135°F (57.2°C) fixed
Operating Voltage: 12/24 V non-polarized nominal, 10 min. to 35 max.
Maximum Ripple Voltage: 30% of nominal (peak to peak)
Alarm Current: 35mA max.
Standby Current: 50μA maximum average
Alarm Contact Ratings: 0.5A @ 30V AC/DC
Auxiliary Contact: Form C
Auxiliary Contact Ratings: 2A @ 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: 7.1 oz. (200 g)

Cut Sheet

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