is there a 3 Way Relay

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Goldenshuttle

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is there a replay that has 3 positions, neutral/switch up /switch down ? like a 3 way toggle switch ?
 

Is not that exactly what a relay normally does? A standard relay switches a common contact from the normally open terminal to the normally closed terminal, and vice versa. I'm assuming you're referring to the analog of a 3-way wall light switch.
 

No. "Three way" switching topologies, e.g. motor forward and reverse control are usually implemented with two separate relays/contactors. There are special designs combining the two relays with a mechanical interlock preventing simultaneous activation of both relays.
 

What are you trying to do? Maybe we can do it another way.
 

The old fashioned telephone exchanges used to use 'step-by-step' relays that were used to switch a phone line to one of 10 (1D) or 1 of 100 (2D) lines. Basically each pulse from the phone dial moved the relay to the next step.
However these were very specialised and have long passed into history (https://www.youtube.com/watch?v=xZePwin92cI).
Susan
 


Stepping relays are still very much alive. For example:

https://www.ia.omron.com/data_pdf/cat/g9b_ds_e_4_1_csm53.pdf?id=967

https://gfinder.findernet.com/public/attachments/26/EN/S26EN.pdf
 
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    arexxx

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@barry & Susan: I have seen in old VW car passat, having something similar to stepping relay. that relay behaves, with one click turns low beam light and second click on the high beam light and so on as you click it multiple times it flips between high and low beam... When I dismantled I found a mechanical spring liver that whenever the coil gets a pulse, the lever pops left or right at each click causing it to trigger a different light.
 

Its been a long time, but I used to have some small-signal relays with dual coils and centre-off. They were great for driving small robots...
 

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