using 611t to create a ground when armed

Digi-key part #255-1618-ND will work fine.

Thank you very much ckeeler. If you could help me understand the workings of this relay now i would very much appreciate it. I believe i know how it is to be hooked up to serve the purpose of my application but i just want to clear a few things up. Here is the catalog page for the digikey relay you referenced above. ( http://dkc3.digikey.com/PDF/T091/P2181.pdf) It is in diagram E on the right hand side of the page.

Correct me if i'm wrong here: For my application, this relay should be wired with poles 1 and 2 wired to a fused 12 volt constant. Poles 15 and 16 should we wired to my door lock wires that show negatives when locked and unlocked respectivley. Pole 5 should be wired to a chassis ground. And pole 8 will then become my (-) ground-when-armed wire.  Do i have it right?

  SWEET!  Hey thanks a lot! While your here and if you don't mind i have a few questions about some of the other relays on that page ( http://dkc3.digikey.com/PDF/T091/P2181.pdf) for my own knowledge in the future. Diagrams 2D and 2F look like they are the exact same relay. Whats the difference in them? And how exactly do they work? Does power acrossed one coil open BOTH of the latches and power acrossed the other coil close both latches? Also, diagram 2B has a relay with a discription over in the chart of "SPST-NO" I know it stands for "single post, single throw-normally open" But how does it function? Does it act in the same manner as the 611T does that i was referencing earlier where one single input on post 16 will open the latch and then another single input on the same post will close the latch? My last question has to do with how much power these things can handle. I know what the coil voltage means but what does the coil resistance, coil current and contact ratings mean in relation to how it functions? What exactly does each number tell me?

If you can set me straight on these last couple questions you will have just opend up a whole new realm of possibilites for me. I had no idea there were relays out there that had these types of functions. Even more exciting is that i will be able to actually go out and find the relays i need in the future without bugging you guys.

in figure 2F that relay type has 2 sets of NO contacts. in 2D one contact set is NO and the other set is NC. in figure 2F yes, power across one coil opens both contacts and then power on the other coil closes both. for the relay in 2D one will be open and the other one closed. the relay in 2B will not work like the 611T. it is a latching relay, but once it is latched to unlatch it, the polarity on the coil must be reversed, it will then stay that way until the polarity is reversed on the coil again, latching the relay once more. the contact ratings are how much current they can carry through them.