PLEASE HELP!!! help creating relay with adjustable run time

Google!

 

have you googled "relay 12V with 2Amp contacts" ?

there's 1000's of hits

I presume you really mean 12V 600mA ? once you get to a few supplier sites you will get that info
the relay wont be rated at 12V 600mA it will more likely be 12V with a certain coil resistance say 12v and 270 Ohms etc
use Ohms Law to work out the current through the coil

Dave

 

You want a relay that can be switched on by 12V 50mA (alternatively, one with a 240 ohm coil resistance or greater).

First you go to Digikey's site.

In the search box you type "relay". You will be taken here.

There are lots of things listed, but scrolling down (typically to the things with the most hits) you will find two entries, one for Power relays (over 2A), and the other for Signal Relays (up to 2A).

Let's start with the signal relays (although you may be sailing close to the wind with contacts rated only slightly above your requirement).

I simply select all the coil currents up to 50mA, coil voltage of 12VDC, contact rating of 1.5 or 2A, and all the contact voltage ratings from 24V up to 1000V (or whatever the limit is). Then I press "Apply filters". You have to do this, because I can't provide a link to the results.

Digikey tells me there are 252 relays that match this. The cheapest is $2.66 in quantities of 1. (note that you didn't specify anything about the configuration of contacts, this one is DPDT)

If we do something similar with power relays, everything is the same except that you don't need to specify a current rating (since they're all 2A or more) then you'll find 768 relays, with the cheapest (SPDT) being $1.15 here.

So you have more than 1000 options, follow those steps and find something suitable. Other sellers will provide similar information, although maybe not as easily searched.