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System Sensor 4WTR-B Smoke Detector w/ Thermal and Relay










4WTRB 4-wire, photoelectric i3 smoke detector with thermal sensor and Form C relay

Replacement For System Sensor 2112/24R, 2112/24TR2112/24TS


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)


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  • Model: System Sensor 4WTR-B
  • 0 Units in Stock
  • Manufactured by: System Sensor

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