Remote water pump switch - latching relay?
I want to install remote water pump switches that operate a latching relay to turn the pump on/off with a single press of a momentary contact switch. I'm tired of being out in the boonies and getting...
Forum Discussion
Tom_M wrote:
Another type of latching relay uses a single coil and magnet. The first pulse pulls the contacts in and the magnet holds them in place. To release the contacts you pulse the coil with a reversed polarity pulse.
Yes, I've seen that type also. There are also some latching designs that have a small circuit inside to simulate ratchet type. They pulse on, pulse off, but need power all the time to hold on. One relay I found also has a mechanical button on top to mechanically operate the ratchet inside and switch it on/off. I looked up the Potter Brumfield relay I have in my scrap box just to see if there was a similar 12V version. (The one I considered rewinding). The replacement cost for that double relay was $150!
