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I am looking for suggestions on a replacement relay to power/activate two MTH RailKing 3 Over 3 signals (30-11024).  I have block set-up activated by an isolated rail. I am admittedly a novice when it comes to electrical and Radio Shack is no longer around for guidance, so I am also interested in a relay (or solution) that is straight forward in the set-up.   I originally tried ITADs, but had problems with dark colored cars  and/or movement on other tracks. I had a Scott's Odds-n-Ends MTH-12T relay that I was able to successfully install a decade ago, but it stopped operating and is stuck in the closed position.  Based on what I can tell these particular relays are no longer manufactured.

I did try searching this forum, but the amount of information on relays is a little overwhelming.  I really would appreciate any help. Thank you in advance.

-Ed Abbot

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azatrax mrapr relay

The Azatrax MRAPR-12V relay module does the same thing as the Scott's relay module.

They even have an application note showing hookup to a signal (yes, they only show a 2-aspect signal but your MTH 3-aspect signals are wired "like" a 2-aspect signal).

azatrax mrapr relay signal light connection

If $10 + shipping is too steep, you can cut this in half or so if you don't mind a bit of wiring (albeit no soldering, no voltmeter).  I've posted a variety of DIY methods to cobble together a relay that can be used for signals powered by Accessory AC and triggered by insulated rail.

ac 12v relay using ebay modules for less than 3 bucks

azatrax alternative signal relay

Usually the insanely low priced modules on eBay mean you'll be waiting weeks for the proverbial slow-boat-from-China.  But for a bit more coin, I see even "fulfilled by Amazon" pricing can be attractive if you need multiple relays...about $7 per DIY relay with free shipping w/$25 order.  I didn't try very hard so if you hunt around on Amazon you can probably find even better pricing.

Amazon pricing - DIY AC relay using 12V DC relay

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  • azatrax mrapr relay
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  • ac 12v relay using ebay modules for less than 3 bucks
  • azatrax alternative signal relay
  • Amazon pricing - DIY AC relay using 12V DC relay
Last edited by stan2004

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