System Sensor 4WTA-B Smoke & Thermal - 4 WireSystem Sensor 4WTA B Smoke & Thermal 4 Wire The 4WTA B is a 4 wire, photoelectric i3 smoke detector with a 135F fixed thermal sensor, and has local sounder. This would be a updated upgrade from the 4WT B detector. Replacement for the the 4WT B. Alarm Contact Ratings: 0. 5 A @ 30V AC DC Alarm Current: 20mA max. @ 12V, 23mA @ 24V Detection: Photoelectric Dimensions: 2. 0" (51mm) H x 5. 3" (127mm) Dia. Freeze Trouble: 41F (5C) Heat Sensor: 135F (57. 2C)
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