Re: [CAD_CAM_EDM_DRO] Re: SS Relays

On Fri, 21 Nov 2003 15:03:23 -0000, you wrote:

>Ah! I ran into this problem and couldn't figure out what was going on
>for the life of me.

Triacs and SCRs turn on, and stay on until either 1) the current drops
below a set value (you can't set it), or the voltage reverses
(reducing the current).

Therefore, good only for AC or applications where there will be
another way of turning off the current...

>
>What type of relay do you use for switching DC?

SSR, but one with an FET or bipolar transistor. A good cheap
electromechanical relay is the headlight relay in a car. 12 volts in,
30 amps capability.

Harvey

>
>Thanks,
>Chris
>
>
>> From: Mark Thompson
>>
>> Hi
>>
>> www.digikey.com is a great place to get most anything electronic.
>>
>> Most relays that are zero crossing are AC only (IE: Triac based).
>So if
>you are
>> trying to switch a DC source the AC type SSR will turn it on but
>not turn
>it off.
>>
>
>
>
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