On Fri, 9 Jan 2015 09:05:37 -0000, Brian Gaff wrote:

Beware of using those magnet operated switches, though they work for a
while I tened to find them unreliable.

Reed switches are fragile, the glass/metal seal particulary so. If
that fails so does the switch. IIRC they are not keen on switching
very much power either, at least the small ones, contact failure
and/or magnetisation of the reeds?

--
Cheers
Dave.