A magnetic contactor is an electromagnetic switching device. It is generally used for controlling three-phase motors. The operation of a magnetic contactor is similar to that of a relay, but a relay is used for low-power or low-voltage connections, and a magnetic contactor is used for high-power or high-voltage connections. As soon as the supply is applied to the magnetic contactor coil, its normally open contacts are closed and normally closed contacts are opened and the associated devices are also operated. This is how a magnetic contactor works.

In case of fire, Electronic hooters are used to alert people. An electric hooter is usually used in fire alarms for sound devices. Two bells are seen in every fire brigade’s office. A fire alarm hooter is installed outside the fire station. Another fire alarm bell is installed inside the fire station. The sound of a Fire Alarm Hooter is comparatively louder than the sound of a Fire Alarm Bell. Hooters are frequently powered by the control panel using the same detector loop and linked to it using an addressable control module.

An NC (Normally Closed) Push Button is a Push Button That, In Its Default State, Makes Electrical Contact With The Circuit. An NC (Normally Closed) Push Button is a Push Button that, in its Default State, Makes electrical Contact With the Circuit. When The Button Is Pressed Down, The Switch no Longer Makes Electrical Contact And The Circuit is Now Open. When The Button is Not Pressed, Electricity Can Flow, But When it is Pressed The Circuit is Broken. This type Of Switch is Also known As a Normally Closed (NC) Switch.