[geeks] Stupid Electronics Help...

[Mike Nicewonger]

On 12/29/2012 08:02 PM, Jonathan Katz wrote:
>> On 12/29/2012 07:51 PM, John Francini wrote:
>>> You want a 'normally closed' relay. This is one where the controlled
> circuit is closed when the relay is de-energized.
>>
>> Or you can get one that does both and just used the closed side. I'd bet
> that will be easier to find.

You'll see designations in the parts books like SPNC and SPDT. Single 
Pole, Normally Closed, and Single Pole, Dual Throw.

The SPDT is the one that will do both (or either) normally open or closed.