ANWETECH AT-SH202 is a 4-wire combined smoke and heat detector with relay output for fire alarm and control systems. It integrates photoelectric smoke sensing and fixed temperature heat detection in one detector, offering reliable alarm performance for residential, commercial and industrial applications.
The ANWETECH AT-SH202 is a 4-wire combined smoke and heat detector developed for fire alarm systems requiring both smoke and temperature detection together with relay-based output. It combines a photoelectric smoke sensor and a fixed temperature heat sensor to provide dependable fire detection in one ceiling-mounted device.
The detector adopts intelligent MCU signal processing and SMT technology to improve stability, reduce interference and maintain reliable long-term performance. Its anti-dust, anti-insect and anti-light interference structure makes it suitable for a wide range of indoor fire alarm applications.
When smoke concentration reaches the preset threshold or when the temperature rises to the fixed alarm point, the detector enters alarm state and lights the red LED. Compared with the 2-wire version, the AT-SH202 provides relay output for easier integration with fire alarm panels, control units and external interfaces.
Operating voltage: DC9V–48V
Static current: <50uA
Alarm current: ≤50mA
Alarm temperature: 57°C ±3°C
Alarm indication: Red LED light
Operating temperature: -10°C to +50°C
Environmental humidity: 0%–95% RH, non-condensing
Alarm output: Relay output
Relay contact rating: 100mA @ DC28V
Sensitivity: 0.065dB/m (±0.15dB/m)
Standard: EN54-7 / UL268
Dimensions: 103 × 53 mm
4-wire version:
