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G. Morgan[_6_]

wrote:

So, what is "normal" for a reed switch? When the magnet is near or
not?

The security industry made up it's own vernacular for contacts. 99% are
N/O (shelf state), closed on magnetic reed trip (actuated).

But..... to avoid confusion, they started calling them "closed loop"
switches. It only added to confusion.

Have a look at GRI, GE, and Honeywell for top quality.

http://www.bassburglaralarms.com/sen...ors_37_ctg.htm