4WTA-B System Sensor 4-Wire Smoke Detector

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The 4WTA-B is a 4-wire, photoelectric i3 smoke detector with thermal sensor and built-in sounder.

Brand: System Sensor
Part Number: 4WTA-B

Availability: In stock




Model 4WTA-B is a 4-wire photoelectric smoke detector. The 4WTA-B incorporates a state-of-the-art optical sensing chamber and an advanced microprocessor. The microprocessor allows the detector to automatically adjust its sensitivity back to the factory setting when it becomes more sensitive due to contaminants settling in its chamber. In order for this feature to work properly, the chamber must never be opened while power is applied to the smoke detector. This includes cleaning, maintenance or screen replacement. This model also features a restorable, built-in, fixed temperature (135°F) thermal detector and is also capable of sensing a freeze condition if the temperature is below 41°F.
Model 4WTA-B contains a piezoelectric horn which generates the ANSI S3.41 temporal pattern in an alarm condition. All detectors on a zone will sound when the power supply to them is reversed. The RRS-MOD can be used for the power supply reversal function. The RRS-MOD also enables all the detectors’ sounders on a zone to be synchronized and allows the zone to be silenced from the panel by entering the alarm silence key at the keypad.
The detector that initiated the alarm condition will have its red LED and Form C relays (if applicable) latched until reset by panel.

NOTE: In order for all i3 sounder detectors on a loop to sound when the panel alarms, the supply voltage polarity must be reversed. A reversing relay, System Sensor model number RRS-MOD, must be used. The RRS-MOD is designed to allow all i3 Series detectors in the same loop to sound when one of the detectors goes into alarm. In addition, the RRS-MOD will synchronize all of the i3 Series sounder smoke detectors on the loop. Some panels may require the use of programmable outputs. Refer to System Sensor literature for further information on the RRS-MOD.
All i3 Series detectors are designed to provide open area protection. Two-wire models must be used with compatible UL Listed panels only.




Additional Info

Additional Info

Part Number 4WTA-B
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(1) 4WTA-B System Sensor 4-Wire Smoke Detector

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    Alarm Contact Ratings    0.5A @ 30V AC/DC
    Alarm Current:    35mA max.
    Detection    Photoelectric
    Dimensions    2.0" (51mm) H x 5.3" (127mm) Dia.
    Freeze Trouble    41°F (5°C)

    Heat Sensor    135°F (57.2°C) fixed

    Humidity Range    0% to 95% RH, noncondensing
    Maximum Ripple Voltage    30% of nominal (peak to peak)
    Operating Voltage    12/24 V non-polarized nominal, 10 min. to 35 max.
    Sensitivity    2.5%/ft. nominal
    Sounder    85 dBA

    Standby Current    50µA maximum average
    Temperature Range    32° to 100°F (0° to 37.8°C)
    Weight    7.1 oz. (200 g)
    Wiring    4-wire
    Wiring Gauge    14-22 AWG