2x magnetic reed switch normally open closed nc no door alarm window security magnetic door switch magnetic contact switch reed switch to dc 5v 12v 24v light black 4 2 out of 5 stars 9.
Garage door contacts closed circuits.
These garage door contacts for closed circuits are used for systems that expect a closed circuit when the magnet and sensor are together.
So this thing provides the ability to activate two relays or monitor four contact sensors.
When the magnet and sensor separate the circuit opens.
Seco larm sm 226rq enforcer overhead door mount magnetic contact closed loop adjustable to fit most door channel widths 2 3 4 70mm gap 24 61cm wire leads enclosed in armored cable 4 7 out of 5 stars 19.
This set is commonly used with security systems.
Customers who bought this item also bought.
I have two garage doors which means that i ll have two contact sensors one per door and i ll need control of two relays one for each opener.
These contacts can be as far as 2 inches apart and still operate.
Camera photo.
This set is commonly used with security systems.
Luckily they re small and pretty affordable.
That means i needed two zigbee io devices.
Security and surveillance accessories.
Smart wi fi garage door opener wireless garage door remote open and close garage door from anywhere compatible with amazon alexa google assistant 4 1 out of 5 stars 746 32 99 32.
These contacts can be as far as 2 apart and still operate.