Why Install an Extra Relay for a Door Holder?

Fire Alarm Door Holder Wiring Diagram

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Why Install an Extra Relay for a Door Holder?

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Door opening alarm circuit diagram
Door opening alarm circuit diagram

Why install an extra relay for a door holder?

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Electric Strike Wiring Diagram
Electric Strike Wiring Diagram

Transistor based Security Alarm
Transistor based Security Alarm

Fire Alarm Door Holder Wiring Diagram - blogmaygomes
Fire Alarm Door Holder Wiring Diagram - blogmaygomes

Door Security Alarm Circuit for Alerting if Door was Opened - Homemade
Door Security Alarm Circuit for Alerting if Door was Opened - Homemade

Infrared Security Alarm Using PhotoTransistor » Circuitspedia.com
Infrared Security Alarm Using PhotoTransistor » Circuitspedia.com

Why Install an Extra Relay for a Door Holder?
Why Install an Extra Relay for a Door Holder?

Fire Alarm Door Holder Wiring Diagram - blogmaygomes
Fire Alarm Door Holder Wiring Diagram - blogmaygomes

Thief/ Door alarm using a transistor - Gadgetronicx
Thief/ Door alarm using a transistor - Gadgetronicx

How to build A Simple Fire-Door Alarm - circuit diagram
How to build A Simple Fire-Door Alarm - circuit diagram

Fire Alarm Wiring Diagram | My Wiring DIagram
Fire Alarm Wiring Diagram | My Wiring DIagram

Burglar Alarm Project: Burglar Alarm Circuit Using Transistor
Burglar Alarm Project: Burglar Alarm Circuit Using Transistor