System Sensor 4WTA-B i3 Series 4-Wire Photoelectric Smoke and Heat Detector, 135°F, Built-In Sounder, White

This 4-wire smoke detector combines audible alarm signaling, relay functionality, and an isolated thermal sensor in a plug-in design with mounting base included. Its 85 dB temporal sounder provides a local audible alert, while the Form C relay supports connected systems.

Drift compensation and smoothing algorithms help reduce nuisance alarms associated with dust accumulation and RF interference. Red and green LEDs indicate operating status, and sensitivity can be checked with a compatible sensitivity reader. The removable cover and chamber support inspection and maintenance, while the Stop-Drop ’N Lock attachment helps secure the detector to its base.

What’s included: 4-wire smoke detector and mounting base.