5621 System Sensor Heat Detector, 135F Fixed Temperature/Rate-Of-Rise, Dual-Circuit Mechanical. The 5621 System Sensor, 5600 series mechanical heat detector is intended for use in property protection applications, or for non-life-safety installations where smoke detection is not practical or appropriate.
The 5621 System Sensor, 5600 series consists of both single- and dual-circuit heat detectors featuring fixed temperature thermal sensors or combination fixed temperature/ rate-of-rise sensors, with temperature ratings of 135F (57C) or 194F (90C).