Latching relay question.

I have learned how a relay works, but doesnt quite understand how latching relay works.
In non-latching relay, the magnetic field creates a magetic force which keeps the armature (the COM pin) attached to the NO pin of the relay, correct?

In the case of lacthing relay, what keeps the armature attached to the NO pin, once the coil has been de-energized?

Thank you.

P.S.
I'm sorry for my behavior in the last thread.
I'll conduct myself in a proper manner.

alphacat said:

I have learned how a relay works, but doesnt quite understand how latching relay works.
In non-latching relay, the magnetic field creates a magetic force which keeps the armature (the COM pin) attached to the NO pin of the relay, correct?

In the case of lacthing relay, what keeps the armature attached to the NO pin, once the coil has been de-energized?

Thank you.

P.S.
I'm sorry for my behavior in the last thread.
I'll conduct myself in a proper manner.

Click to expand...

hi,
If you are interested in relay types, look here:
**broken link removed**

Hi omegamouse

It depends on the type of latching relay.

Some have two coils: one to turn the relay on and another to turn it off.

Some have one coil: connect the power to it in one direction, it turns on, reverse the power connections and it turns off.

Imagine you have a toggle switch with a steal lever and two large electromagnets placed either side of it: activate one and it turns on, activate the other and it turns off. This is a two coil latching relay.

Imagine you have a toggle switch with a permanent magnet fixed to its lever and a large electromagnet placed next to it: connect the power in one direction and the magnet will be drawn towards it, turning the switch on, connect the power in the other direction and it will be repelled causing it to turn off. This is how a single coil latching relay works and is similar to how the voice coil in a speaker moves back and forth.

A latching relay has a similar mechanism to both of the above but it's neatly integrated into an enclosure.

Your ball pen has a mechanism that engages its tip on one push and disengages the next.
That same mechanism attached to a single coil solenoid would make a latching relay. One push connects, the next disconnects.
Replacing your finger with an electromagnet as in a relay, does the latching feature.
Miguel

Thanks bro.

So the difference between non-latching relay and latching relay is that the latching relay has a permament magnet on its COM, while the non-latching relay doesnt have it?

alphacat said:

Thanks bro.

So the difference between non-latching relay and latching relay is that the latching relay has a permament magnet on its COM, while the non-latching relay doesnt have it?

Click to expand...

No! Some latching relays have a mechanical latch like the aformentioned pens, while some use a permanent magnet for latching, and others use a second coil to unlatch the mechanical latch.

Thank you all.
looks like i got a lot to catch up with.

Eric, its a great link, thanks cat.