Ananda Alumni: Mercury relay question [RE-wrenches]

[Todd Cory, Mt. Shasta Energy Services]

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A diode across a coil is usually a suppressor for the spike that occurs 
from the collapsing magnetic field when a coil is deenergized.

Todd

Mick Abraham wrote:

>Hi, 
>
>My client's RV needs a "low voltage disconnect" for the 12 volt 
>circuits...and we also want a remote control for "manual off" so a 
>normal C-40 type control won't work. 
>
>I may build a control with a mercury displacement contactor for the 
>switching, and the Morningstar Relay Driver for the deciding. 
>
>As installed in the Ananda Powercenter, these mercury relays have some 
>cryptic components on the coil terminals and I wonder if I need those in 
>my application? It looks like there's a diode in series with the coil 
>control voltage, and a second diode wired reverse bias across the coil. 
>
>What are those widgets for? Do I need them?
>
>Mick Abraham, Proprietor
>www.abrahamsolar.com
>
>  
>


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