This is not what I am accustomed to seeing for a latching relay, where=20
each pulse (only one polarity is used) switches the relay. But, it is=20
clear for this relay, one polarity closes the contacts, and the other=20
(negative) polarity opens the contacts. As I see it, this is a neat way=20
to control the relay from an AC source, with 2 wires, and assure that=20
the action ( on or off ) is correct. With the latching relay controlled=20
by a pulse, you don't know if it's on or off. This is accamplished with=20
a minimum of components. But this isn't a problem with local control of=20
something where you can see a light on or off, or a motor is running. A=20
closet pull chain controlled light is a good example.

On 10/25/2011 2:54 PM, alan smith wrote:
> http://www.aislu.com/documents/HG30T_EN_S101027V1.pdf
>
> If you look at the drive principle, its saying a position DC to latch, an=
d a negative DC to unlatch?  Is this the same thing as just reversing the D=
C voltage on the coil? Ive not used latching relays before....
>
>
>   =20
--=20
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