magnetic reed switch

B

bromleybysea

Well-Known Member
Joined
10 Nov 2007
Messages
677
Location
Not Bromley anymore, yippee!!
Visit site
Can someone advise a source of miniature magnetic reed switches that are normally closed (N/C)i.e. they make the circuit when the magnet is removed. All the Maplin ones are N/O as far as I can see. It's to repair a dan buoy light. BTW- not being a electronics expert, I may have got this completely wrong- please be gentle!
 
[ QUOTE ]
All the Maplin ones are N/O as far as I can see.

[/ QUOTE ] They also list "change over", CO, ones which will do the trick.
 
[ QUOTE ]
That type of reed switch is used on alarm systems to detect opening of doors and windows.

[/ QUOTE ]MRS's used in the common alarm systems are closed when magnet is in place and open circuit when magnet is removed. It is common practice on domestic systems to wire several MRSs in series to cover a number of doors on one zone (circuit) - open a door and one of the switches goes O/C and off goes the alarm.
---------------------
hammer.gif
Artificial Intelligence is no match for Natural Stupidity
 
[ QUOTE ]
Can someone advise a source of miniature magnetic reed switches that are normally closed (N/C)i.e. they make the circuit when the magnet is removed - please be gentle!

[/ QUOTE ]

Hello BromleybySea

Your above statement "make the circuit when magnet is removed" usually means that they are normally open and then 'close' (making the circuit) when magnet is removed?

So, if that is what you are looking for, then N/O is what you require. If you want to email me the circuit, I will be able to advise further?
 
[ QUOTE ]
Hello BromleybySea

Your above statement "make the circuit when magnet is removed" usually means that they are normally open and then 'close' (making the circuit) when magnet is removed?

So, if that is what you are looking for, then N/O is what you require

[/ QUOTE ]

Are you really really absolutely sure about this. With a profile that says what it does you must be right but why call a switch that is normally open and only closes if someone sticks a magnet next to it "normally closed"? and vice-versa
 
We have a Maplins local to us which I am going in tomorrow (friday), do you want me to check for you. As I understand it you want a reed switch that is closed when no magnet is present.
 
You must log in or register to reply here.

Share this page

Top