< img height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=5580415518647572&ev=PageView&noscript=1" />
Close this search box.

Fire Alarm Relay Module and How It Works

Fire alarm relay module
Fire alarm relay module

In a fire alarm system, a small amount of power must trigger a larger response to perform specific tasks. This is where a fire alarm relay module comes in. It’s a device that takes a small amount of power from the fire alarm system control system and uses it to operate a much higher voltage from an external power source.

This is a guide to this specific application of the fire alarm relay module. You’ll learn about how it works and what purpose it serves in the fire detection systems of buildings.

What is Relay Module in Fire Alarm System?

To begin with, what is a fire alarm relay module? Put simply, a fire relay module is a small electrical device that uses a small amount of power to perform specified tasks. It does so by receiving instructions from the fire alarm system and executing the required switching action. But what is a fire alarm relay in the first place?

Fire Alarms Relays Explained

Fire alarm relays are devices used in fire safety systems. They switch specified circuits on or off during a fire emergency. They are activated by a small amount of power from the fire alarm system sensors. This is how they work:

First, the fire alarm system sends a small amount of electricity to the relay. The relay then uses this small amount of power to close a switch.

This switch closes the circuit to a system such as a sprinkler system or electric door that requires a much larger amount of power to operate.

That way, the relay module in fire alarm system controls is able to activate devices without overwhelming the system. This is important in an emergency situation, when every second counts.

Function of Relay Module in a Fire System

The function of relay module in fire system control is to provide a way for a high-voltage device to be controlled by a low-voltage signal. This is done by closing a switch that activates the device when the fire alarm sends a small current to it. In practice, a relay in a fire alarm system may be used to perform the following functions:

  • Close Doors: A fire alarm relay can be used to automatically shut fire doors in a building when the fire alarm is triggered. This helps to contain the fire and prevent it from spreading.
  • Activate Sprinklers: The fire relay module can be used to activate the sprinkler system in a building when the fire alarm is triggered.
  • Sound Alarms: A fire alarm relay module is often used to activate a sound alarm in an emergency. This warns people in the vicinity of the fire and helps them to evacuate the area.
  • Switch OFF AC Systems: The stream of air coming out of an air conditioner can spread the fire in a building or even smoke and fumes. A fire alarm relay can be used to switch off the AC system and prevent the fire from spreading.
  • Switch On Smoke Exhaust Systems: The smoke exhaust system in a building helps to clear out smoke and fumes. A fire alarm relay can be used to switch it on.
  • Switch Off Loud Music: During a fire, it is important to be able to hear fire alarms and other warnings. a fire alarm relay module is often used to switch off loud music when the fire alarm is triggered so that people can hear the warnings.
Fire alarm relay module wiring diagram
Fire alarm relay module wiring diagram

How Does a Fire Alarm Relay Work?

So, how does a fire alarm relay work? Like other module relays used in different applications, the fire alarm relay module is a unit that’s packaged on a small PCB and supplied with connection pins or terminals.

The relay module input connections interface with the fire alarm system, while the output terminals connect to the devices that need to be controlled. Here is how it works.

  • When the fire alarm is triggered, it sends a small amount of current to the relay module.
  • The fire relay module, using this signal, will close a set of electrical contacts.
  • This will complete a circuit and allow current to flow from the external power source to the component being activated, such as a door mechanism or other system.

The use of a relay control module in fire alarm system panels allows the use a smaller current to activate much higher voltage circuits than it could be possible.

Fire alarm relay module in a fire alarm system
Fire alarm relay module in a fire alarm system

Relay Module in a Fire Alarm System

The relay module is usually located near the fire alarm control panel. In this location, the cabling is greatly minimized. The module is then connected to the fire alarm system via the input side and the controlled circuit (higher voltage), on the output side.

You can also use a fire alarm relay module to activate other relays in the system. In some cases, the relay makes a part of the alarm system components and may be installed on the same board with other alarm system modules

The fire alarm control relay module must be installed by a professional. This is because its proper operation is crucial to the effective functioning of the entire fire safety system.

When installing a relay module in a fire system, ensure that local building and fire codes are met. The relay specifications should also be checked to see if it is compatible with the fire alarm system. Doing so will help ensure it will work as expected.

GEYA GY-RA6/7 relayl module echnical parameter:

·Rated voltage                 5VDC/12VDC/24VDC
·Single power consumption 约216mW
·Wiring polarity           No polarity
·Terminal type                 European terminal
·Number of control Bit        4,8,12,16,32
·Relay type41F
·Contact type1Z/1H
·Rated voltage250VAC/30VDC
·Rated current6A/Road
·Terminal typeEuropean terminal
·Operating temperature  -20~55℃
·Storage temperature  -40~70℃
·Installation  DIN35 DIN-G guide rail installation
·Standard  IEC61010-1
·Test withstand voltage            (50Hz, 1min)      Between output channels  2kV
Between input and output  4kV
·Pollution level  2
·Overvoltage  Ⅱ
·Action time<6ms
·Release time<3.0ms



A fire alarm relay module is a module-driven relay that can be activated by a very small input signal from a microcontroller or even sensor. Because it requires very little power to actuate, the relay finds useful application in the smoke detection systems of fire alarms. These include both residential and commercial or even industrial buildings.

Picture of William

I am William, Electrical Engineering Author. Dedicated to writing technical articles on Timer Relay, Monitoring Relay, Surge Protection Device and other electrical devices. With 7 years of writing experience, I am committed to providing accurate and in-depth expertise to my readers.


    I have a electrical question on my study sheet says: Vent system fails to shut down, which fire alarm device is faulty?
    a) Initializing moduel b) Monitor module c) Relay Module d) Signal module

    I have looked endlessly for the answer and its driving me crazy. But based on this article it seems like it would be the Relay Module?

    Any help is much appreciated!

    C.) Relay Module is most likely the answer. The term “Initializing module” is not commonly used in the context of fire alarms, although any of them can cause shutdown failure due to bad programming.

Leave a Reply

Table of Contents
Contact Us
Contact Us
Contact Us

Shopping cart


No products in the cart.

Continue Shopping


Contact Us