Re: [Emc-users] off topic - device info needed

[Dave <EM...@DC...>]

On 11/26/2012 1:54 PM, Jon Elson wrote:
> jeremy youngs wrote:
>    
>> they look like solid state relays to me
>>
>>      
> They are phase angle SCR controllers.  You put a variable resistance
> across two of the terminals, and they vary the power to a line-powered
> device.  Basically a heavy-duty lamp dimmer.
>
> Jon
>
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>    

Devices like that are commonly used to control industrial heaters - like 
band heaters, die heater cartridges, etc

Dave