Speed Monitoring Relay is a safeguarding mechanism. Receiving incoming signals, analysing and determining them, and then sending out an alert if a certain value (threshold) is met are the basic duties. Basically, it is a switch that is located between the control panel for the fire alarm system and the power supply for the door locking mechanisms. Although there are various types of fire relays and configuration options, a fire relay function is straightforward: in the event of a fire alarm, it opens the chosen doors.