The 4-wire network smoke detector works in conjunction with the fire alarm control panel. Its power line and signal output line are separate. And the power signal and the output signal are transmitted separately. The return signal line is not affected by the power source. Then, the test signal is more real and accurate.
The 4-wire network smoke detector connects with the fire alarm control panel via the four-core wire. When the product detects the existence of smoke and the smoke concentration gets to the alarm level, then, the internal circuit of the product generates the relay on-off signal, and sends the signal to the fire alarm control panel. And the red LED indicator flashes for indication. Having passed the LPCB EN54-7 certification, our product is marked by stable performance and strong conformability.
Hardwired Smoke Alarm | Interlinked Smoke Detectors | Fire Sensors