Normally open door switch

Free delivery and returns on all eligible orders. Reed switches come in two main varieties called normally open (normally switched off) and normally closed (normally switched on). Since their unalarmed state is for them to be open , if the cable going to them is cut then the alarm will not trigger, and of course not be triggerable anymore.

The open or closed position is determined by how you attach the wiring. I used the switch to install an indicator light showing if my garage door is .

When the magnet is remove the circuit is made (closed).

It comes complete with fixing screws.

Lead (three) white (common port), gray (N.C.), brown (N.O.). This switch is closed when magnet is beside it. The reed switch is an electrical switch operated by an applied magnetic field.

Most of these are momentary switches , which are normally open (NO) meaning that the circuit connection is made when it is depresse and breaks immediately upon release. Automotive horns are normally open push button switches. We will use them in our A-H-A project.

There are two options of these magnetic switches. Therefore the alarm circuit is interrupted and NO power is drawn from the battery of this remote sensor. Normally open circuits close when the magnet engages. Alarm systems – A reed switch will be found in many alarm systems for sensing whether doors and windows are open or closed. Heavy duty magnetic contacts are also available for roller shutter and up-and-over garage doors.

When you release the button the horn stops. Think of the basic switch of two wires. If the wires are not connected the switch is open. To turn things OFF when the magnet is present, you need this style that has that option. The catch with this is that the magnet needs to . The nice thing about this relay is that you can use several switches and when any door is open the light will go on.

Set includes magnet and proximity switch. Pack Universal Car Door Trunk Alarm Light Hood Jamb Pin Switch Bonnet. NO ( normally open ) means that the internal switch is open when the magnetic module is against the switch module ( door is closed). Most security systems call for NC door switches so if the wire is cut the .