Scott's Odds & Ends MTR-12T Relay

Joe, there are lots of choices.  To help narrow down the range, could you tell us what kind of detection method you want to trigger the relay?

Ie, insulated rail, infrared, or ultrasonic train detection.

Also do you want something that has screw terminal connections or would you prefer soldering?

This might help.  There appear to be instruction sheets for this relay in this thread:

       Scott's Odds N Ends Relays | Jim S

Mike

@SteveH posted:

Joe, there are lots of choices.  To help narrow down the range, could you tell us what kind of detection method you want to trigger the relay?

Ie, insulated rail, infrared, or ultrasonic train detection.

Also do you want something that has screw terminal connections or would you prefer soldering?

I plan on using insulated rail. I prefer terminal connections. I will be running DCS/TMCC command.

You may be interested in taking a look at the project Rod Stewart and Stan2004 are working on to get an idea about what is possible with the inclusion of a delay circuit to eliminate chatter (sometimes inherent with insulated rail triggering) and provide a short signal ON time where the occupancy signal light stays red after the train departs that track section.

https://ogrforum.com/...arduino-board?page=1

The newer versions of DC multi-relay modules available now are powered by a separate power supply either 5 or 12VDC (depending on the chosen relay module) and can be easily triggered by the insulated rail method while still using 18VAC power on the track.  Here's a 12VDC example:

https://www.amazon.com/dp/B00L...dExvZ0NsaWNrPXRydWU=

There are also AC relays out there designed for 12 Volts AC triggering from the outside rail (no separate power supply required), but these are a bit more expensive and the 18V AC used for Command control track voltage should be reduced between the track and this 12VAC relay coil input.

https://www.amazon.com/gp/prod...00?ie=UTF8&psc=1

Thank you Steve.

I’m putting three items on the for sale posts. Two of them are the relays. Never been used.

For anyone looking at this thread and wanting a substitute for the Scott's Odds & Ends MTR-12 Relay, here is a link to another  discussion with a few more options provided by Stan2004 and John that may be helpful:

https://ogrforum.com/topic/replacement-relay

@stan2004 posted:

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).

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.

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.

@gunrunnerjohn posted:

Insulated Track Signal Driver, Rev. 2

Contact me at York, good deals on the Insulated Track Signal Driver, Rev. 2, does exactly what you want and has provisions for extending the on-time easily if desired.  Drop me a line at: