Relay question

Dave G4UGM dave.g4ugm at
Sat Nov 29 13:48:04 CST 2014

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at] On Behalf Of tony
> Sent: 29 November 2014 19:46
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: Relay question
> > I had a 3-Rail Hornby "O" gauge that used a toggle relay to reverse. I
> > think rather than over voltage it was set up so the relay had a very
> > low "hold-in voltage". It had a pawl that drove a commutator shaft
> > that generated the reversing. I think it was 24volt but might have been
> higher....
> Sounds like the one I was describing, except that the relay coil was the
> field winding with the moving pole piece acting as the relay armature. The
> switch was a fibreboard disk with brass contact plates on it and 3 spring
> contacts pressing on it. The fourth connection was made via the pivot
> to the chassis, then to the wheels and back to the track. I still have the
> unit somewhere, it'll turn up in the next year or so as I unpack
> IIRC it was 20V AC
> -tony

I wosh I still had any of mine, it was FUN!

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