ELECTRONIC RELAY INFO NEEDED!!!!

[Vittorio]

I've purchased a phone system that's capable of releasing typical
magnetic locks remotely from any extension phone. An accessory called
"external feature module" is responsible for deacivating a mag lock via
a terminal block controlled by any phone. The circut is normally
closed, when opened the power to the mag lock's rendered deactivated.
My mag lock has to be deactivated by closing two leads. For some reason
the manufacturer doesn't want the lock to be unpowered in order to gain
egress. Here's my question. The telephone manufacturer tells me I need
a "normally open" relay that serves a nomally open circut for my type
of mag lock. If I select a 12 VDC (INPUT VOLTAGE) SPDT (CONTACT TYPE)
10 AMPS (LOAD RATING @240 VAC), (POWER COMSUMPTION) 115 mA, 5 PIN RELAY
- spade terminal relay. OR DO I NEED AN ENCLOSED POWER RELAY DPST-NO 25
AMPS 12 VDC 158 mA (STANDARD WITH DC INPUT VOLTAGE) CAN YOU PEOPLE HELP
ME MAKE THIS FLY?

 

[AutoTracer]

Sounds like either of those relays will work. Both are 12V and about the
same current for the coil and both have contacts rated for 115V (i assume
because you didn't include it for the second one)at least which is what the
lock uses.

The first one is SPDT So you get one switch with one NO and one NC contact
on it. You use the NO side for your application. The second switch DPST is
two switches both having only NO contacts only. You can use either one of
these switches.

A relay with DPDT contacts is like the SPDT but has two switches and is
quite universal because it can be wired many ways. Enclosed relay sounds
like a good idea for safety but may not be necessary if they are all in a
closed box.

The first part of your description seems to contradict the second. SInce
there may be uncertainty, the SPDT switch will give you one of each NO and
NC contacts in case you got it backward.


I think maybe you are saying the feature module has a NC switch contact
output but the lock needs a NO switch input. The Feature module drives the
realy 12V coil. When unlocking, the feature module switch opens up and this
de-energizes the relay which Closes the NC contacts and activates the lock
solenoid. In any case go with the SPDT so you can try it either way.

 

[Vittorio]

that was a very helpful reponce thankx autotracer