wireless motion sensor and form C relay

hacksawMarch 23, 2011

I'm seeking to connect a wireless motion sensor to my hard wired door bell chime. I see that many of the wireless motion sensor receivers have a form C dry contact relay with optional NO/NC positions. Being an "old timer" I'm only familiar with electromagnetic relays, can the door bell wire connect to this type of relay in the NO position? And if not does anyone make such a wireless motion sensor receiver combination that will run a hard wired door chime?

Thank you for reporting this comment. Undo
brickeyee

"Being an "old timer" I'm only familiar with electromagnetic relays..."

The output is a set of relay contacts.
"Dry contacts" means they are not mercury whetted and may have problems with low voltage (less than 5 V or so DC) or low current (less than 1 mA or so).
These are called 'dry circuit conditions.'

The typical 24 VAC on a doorbell is high enough voltage and the currents normally large enough (many 10s of mA minimum) to prevent dry circuit conditions from causing problems.

    Bookmark   March 23, 2011 at 3:05PM
Thank you for reporting this comment. Undo
tombs31

Dry contacts means that no voltage is present at either terminal. It is designed to switch a seperate source of power

    Bookmark   March 26, 2011 at 6:54AM
Sign Up to comment
More Discussions
Insulation in electrical box
While in my attic the other day I saw an open electrical...
sgilliatt
Re-wiring range to service spa
what connectors are appropriate for joining 6-3 NMB...
justsomeotherdude
Spa Capacitor question
My spa is wired for 220v. The pump motor is rated for...
pugmark
Replacing dimmer switch: different wire colors on new switch
My DR lights, which are controlled from two switches,...
msa6
A/C wired to main panel only?
I had 2 electricians come out to bid upgrading my service...
frank_diy
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™