[EVDL List]

Lee Hart wrote:

> The traditional solution is a DC-rated relay like the Potter
> & Brumfield KUEP series. They come in SPST versions with a
> 150vdc 10amp contact, or DPST versions with two 150vdc 5a
> contacts (wire in series for 300vdc).
>
> There are also a few relays specified to switch low current
> at high DC voltages. One I've used is the Schrack PT52B012B,
> which is a 4PDT relay with 250vac 6a contacts that are also rated at
>
> 6a at 30vdc
> 1a at 50vdc
> 0.4a at 100vdc
> 0.25a at 300vdc
>
> Since this is a 4-pole relay, you can also wire the poles in
> series for higher voltages or currents.

Another option is to use a reed relay; one almost has to search to find one rated to switch less than 200VDC @ 0.5A. They tend to be smaller and cheaper than the electromechanical alternatives (e.g. the Schrack relay above, PB1161-ND at Digikey, is $5.69ea, while the HE125-ND reed relay, rated to switch 300VDC and 0.5A and carry 1.2A, is $2.21).

Cheers,

Roger.

_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev

 

[EVDL List]

Ok, using the HE125-ND (HE751A1200)

so #2 get 12v+ and #6 gets 12v-

and the switch is 8 and 14 pins?

Lee Hart <[email protected]> wrote:

> On 9/21/2010 11:18 AM, Roger Stockton wrote:
> > Another option is to use a reed relay; one almost has to search to find
> one rated to switch less than 200VDC @ 0.5A. They tend to be smaller and
> cheaper than the electromechanical alternatives (e.g. the Schrack relay
> above, PB1161-ND at Digikey, is $5.69ea, while the HE125-ND reed relay,
> rated to switch 300VDC and 0.5A and carry 1.2A, is $2.21).
>
> That should be a good choice for this application, since KSI draws very
> low current.
>
> --
> Lee A. Hart | Ring the bells that still can ring
> 814 8th Ave N | Forget the perfect offering
> Sartell MN 56377 | There is a crack in everything
> leeahart earthlink.net | That's how the light gets in -- Leonard Cohen
>
> _______________________________________________
> | REPLYING: address your message to [email protected] only.
> | Multiple-address or CCed messages may be rejected.
> | UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
> | OTHER HELP: http://evdl.org/help/
> | OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.sjsu.edu/mailman/private/ev/attachments/20100926/9fe581a0/attachment.html
_______________________________________________
| REPLYING: address your message to [email protected] only.
| Multiple-address or CCed messages may be rejected.
| UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
| OTHER HELP: http://evdl.org/help/
| OPTIONS: http://lists.sjsu.edu/mailman/listinfo/ev