I can only assume you may be talking about something like a latching relay. This is a device that when a button is pushed it sends the current in one direction down cable A, & if you push the button again it will unlatch from & send it in another direction, down the cable B. If i remember this is also known as a flipflop relay.
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by shraddhamane » Fri Jan 25, 2019 11:39 am 